All Calculators
Explore every calculator on DigiToolkit in one place. Use the search box, category filter, alphabet and sort options to quickly find the right tool. Each calculator is free, works in your browser and shows the formula and a worked example so you can trust the result.
APR Calculator
APR (effective) = (1 + r/n)^n - 1
Open calculator โAPY Calculator
APR (effective) = (1 + r/n)^n - 1
Open calculator โAdding Fractions Calculator
Apply the operation, then simplify by the GCD
Open calculator โAge Calculator
Difference between the two dates expressed in years, months and days
Open calculator โAge Difference Calculator
Count days between two dates and express in multiple units
Open calculator โAlgebra Calculator
Symbolic algebra: simplify, expand, differentiate or evaluate the expression
Open calculator โAmazon FBA Calculator
Profit = price - product cost - fees; margin = profit/price x 100
Open calculator โAnnuity Calculator
FV = PMT x ((1+r)^n - 1)/r; PV = PMT x (1-(1+r)^-n)/r
Open calculator โArc Length Calculator
Arc = 2 pi r x (angle/360); Sector area = pi r^2 x (angle/360)
Open calculator โArea Calculator
Area = length x width; Perimeter = 2 x (length + width)
Open calculator โArea Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator โAspect Ratio Calculator
Ratio = width / height, simplified to lowest terms
Open calculator โAtal Pension Yojana Calculator
FV = P x [((1+i)^n - 1) / i] x (1+i), where i = monthly rate, n = months
Open calculator โAverage Calculator
Mean = sum of values / count
Open calculator โAverage Percentage Calculator
Mean = sum of values / count
Open calculator โAverage Speed Calculator
Average speed = total distance / total time
Open calculator โBMI Calculator
BMI = weight(kg) / height(m)^2
Open calculator โBMR Calculator
Mifflin-St Jeor: BMR = 10xkg + 6.25xcm - 5xage + (5 male / -161 female)
Open calculator โBODMAS Calculator
Safely evaluate the mathematical expression
Open calculator โBasic Calculator
Safely evaluate the mathematical expression
Open calculator โBinary Addition Calculator
Parse from the source base and render in the target base
Open calculator โBinary Calculator
Parse from the source base and render in the target base
Open calculator โBinary Subtraction Calculator
Parse from the source base and render in the target base
Open calculator โBlack-Scholes Calculator
Black-Scholes-Merton option pricing for European options
Open calculator โBody Fat Calculator
US Navy method using log10 of body circumferences and height
Open calculator โBody Shape Calculator
WHR = waist / hip
Open calculator โBody Surface Area Calculator
Du Bois: BSA = 0.007184 x weight^0.425 x height^0.725
Open calculator โBody Weight Calculator
Robinson formula plus a BMI 18.5-24.9 healthy range
Open calculator โBond Calculator
Price = sum( coupon / (1+y)^t ) + face / (1+y)^n
Open calculator โBra Size Calculator
Band from underbust; cup from the bust-minus-underbust difference
Open calculator โBrick Calculator
Standard brick 0.19 x 0.09 x 0.09 m with mortar; bricks = wall volume / brick volume
Open calculator โBusiness Days Calculator
Count weekdays (Mon-Fri) between the two dates, excluding weekends
Open calculator โBusiness Loan Calculator
EMI = P x r x (1+r)^n / ((1+r)^n - 1)
Open calculator โCAGR Calculator
CAGR = (End / Begin)^(1/years) - 1
Open calculator โCTC Calculator
In-hand = CTC - employer PF - employee PF - professional tax - other deductions (simplified)
Open calculator โCable Size Calculator
Pick the smallest copper cross-section keeping voltage drop within about 3% (simplified)
Open calculator โCalculator
Safely evaluate the mathematical expression
Open calculator โCalculus Calculator
Symbolic algebra: simplify, expand, differentiate or evaluate the expression
Open calculator โCalorie Calculator
TDEE +/- calorie adjustment for the goal
Open calculator โCalorie Deficit Calculator
TDEE +/- calorie adjustment for the goal
Open calculator โCar Loan EMI Calculator
EMI = P x r x (1+r)^n / ((1+r)^n - 1)
Open calculator โCarbohydrate Calculator
Carbs/protein at 4 kcal/g, fat at 9 kcal/g, split by chosen ratio
Open calculator โCentimeters to Feet Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator โCircle Area Calculator
Area = pi x r^2; Circumference = 2 x pi x r
Open calculator โCircumference Calculator
Area = pi x r^2; Circumference = 2 x pi x r
Open calculator โCircumference-to-Diameter Calculator
Diameter = circumference / pi
Open calculator โCommercial Loan Calculator
EMI = P x r x (1+r)^n / ((1+r)^n - 1)
Open calculator โCommission Calculator
Commission = sales x rate/100
Open calculator โCompound Interest Calculator
A = P x (1 + r/n)^(n x t); Interest = A - P
Open calculator โConstruction Calculator
Volume = L x W x D; dry volume x 1.54 split by the mix ratio
Open calculator โCredit Card Calculator
Iterate monthly: balance grows by monthly rate, falls by payment
Open calculator โCube Root Calculator
result = value^(1/root)
Open calculator โCubic Equation Solver
Solve ax^3 + bx^2 + cx + d = 0 numerically
Open calculator โCubic Feet Calculator
Volume = length x width x height
Open calculator โCubic Feet to Square Feet Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator โCubic Meter Calculator
Volume = length x width x height
Open calculator โCurrency Converter
Converted = amount x exchange rate
Open calculator โCurrent Calculator
V = I x R; P = V x I (leave the unknown as 0)
Open calculator โCylinder Area Calculator
Volume = pi x r^2 x h; Surface = 2 pi r (r + h)
Open calculator โData Calculator
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator โDate Calculator
Resulting date = start date + days (negative subtracts)
Open calculator โDate Difference Calculator
Count days between two dates and express in multiple units
Open calculator โDate and Time Calculator
Resulting date = start date + days (negative subtracts)
Open calculator โDays Until Calculator
Days remaining = target date - today
Open calculator โDebt-to-Income Ratio Calculator
DTI = monthly debt / monthly income x 100
Open calculator โDecimal Calculator
Apply the chosen arithmetic operation to the two numbers
Open calculator โDecimal to Fraction Converter
Convert decimal to fraction and simplify by the GCD
Open calculator โDecimal to Hexadecimal Converter
Parse from the source base and render in the target base
Open calculator โDegree Calculator
Convert between degrees, radians and gradians (180 deg = pi rad = 200 grad)
Open calculator โDensity Calculator
Density = mass / volume
Open calculator โDepreciation Calculator
Straight line = (cost - salvage)/life; DDB rate = 2/life on book value
Open calculator โDerivative Calculator
Symbolic differentiation with respect to the variable
Open calculator โDifference Calculator
Apply the chosen arithmetic operation to the two numbers
Open calculator โDilution Calculator
After % = your shares / (existing + new shares) x 100
Open calculator โDiscount Calculator
Saving = Price x discount/100; Final = Price - Saving
Open calculator โDistance Calculator
Haversine formula on the Earth's radius (6371 km)
Open calculator โDividing Fractions Calculator
Apply the operation, then simplify by the GCD
Open calculator โDivision Calculator
Apply the chosen arithmetic operation to the two numbers
Open calculator โDouble Integral Calculator
Numeric integration (Simpson's rule) from a to b
Open calculator โDown Payment Calculator
Down payment = price x percent/100; loan = price - down payment
Open calculator โELSS Calculator
FV = P x [((1+i)^n - 1) / i] x (1+i), where i = monthly rate, n = months
Open calculator โEMI Calculator
EMI = P x r x (1+r)^n / ((1+r)^n - 1), where r = monthly rate, n = months
Open calculator โEffective Annual Rate Calculator
APR (effective) = (1 + r/n)^n - 1
Open calculator โEigenvalue Calculator
Compute determinant, inverse or transpose of a square matrix
Open calculator โEnergy Calculator
kWh = power(kW) x hours x days; cost = kWh x tariff
Open calculator โEquation Solver
x = -b / a
Open calculator โEquity Calculator
Equity value = total value x ownership / 100
Open calculator โExponent Calculator
result = base^power
Open calculator โFFMI Calculator
FFMI = lean mass(kg) / height(m)^2; normalised adds 6.1 x (1.8 - height_m)
Open calculator โFIRE Calculator
Future monthly expense grows with inflation; corpus = 25x annual expense (4% rule); SIP solves for that corpus.
Open calculator โFace Golden Ratio Calculator
phi about 1.6180339887; longer = value x phi, shorter = value / phi
Open calculator โFace Shape Calculator
Ratio = face length / face width; classified into common face-shape bands
Open calculator โFactorial Calculator
n! = n x (n-1) x ... x 1
Open calculator โFactoring Calculator
Symbolic algebra: simplify, expand, differentiate or evaluate the expression
Open calculator โFeet Calculator
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator โFeet and Inches Calculator
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator โFeet to Inches Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator โFeet to Meters Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator โFeet to Square Feet Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator โFibonacci Calculator
F(n) = F(n-1) + F(n-2), starting 0, 1
Open calculator โFinancial Calculator
Simple: P x r x t. Compound: P x (1+r)^t - P
Open calculator โFixed Deposit Calculator
A = P x (1 + r/n)^(n x t)
Open calculator โForex Calculator
Converted = amount x exchange rate
Open calculator โForex Compounding Calculator
A = P x (1 + r/n)^(n x t); Interest = A - P
Open calculator โFraction Calculator
Apply the operation, then simplify by the GCD
Open calculator โFunction Calculator
Safely evaluate the mathematical expression
Open calculator โFuture Value Calculator
FV = PV x (1 + r)^t
Open calculator โFuture Value of Annuity Calculator
FV = PMT x ((1+r)^n - 1)/r; PV = PMT x (1-(1+r)^-n)/r
Open calculator โGPA Calculator
GPA = sum(grade point x credit) / sum(credit)
Open calculator โGPA to Percentage Converter
Percentage = CGPA x factor (commonly 9.5 for CBSE)
Open calculator โGST Calculator
Add: GST = Amount x rate/100. Remove: Net = Amount x 100/(100+rate)
Open calculator โGear Ratio Calculator
Ratio = driven / driving; output rpm = input x driving / driven
Open calculator โGestational Age Calculator
Naegele's rule: due date = LMP + 280 days
Open calculator โGold Loan Calculator
EMI = P x r x (1+r)^n / ((1+r)^n - 1)
Open calculator โGolden Ratio Calculator
phi about 1.6180339887; longer = value x phi, shorter = value / phi
Open calculator โGraphing Calculator
Safely evaluate the mathematical expression
Open calculator โGratuity Calculator
Gratuity = (15 x last salary x years) / 26
Open calculator โGrowth Calculator
CAGR = (End / Begin)^(1/years) - 1
Open calculator โHCF/GCD Calculator
GCD via Euclid's algorithm; LCM = product / GCD pairwise
Open calculator โHRA Calculator
Exemption = least of (actual HRA, rent - 10% of basic, 50%/40% of basic)
Open calculator โHarris-Benedict Calculator
TDEE = BMR (Mifflin-St Jeor) x activity factor
Open calculator โHaversine Distance Calculator
Haversine formula on the Earth's radius (6371 km)
Open calculator โHeight Calculator
Mid-parental height: boys = (father + mother + 13)/2; girls = (father + mother - 13)/2
Open calculator โHeight Percentile Calculator
Mid-parental height: boys = (father + mother + 13)/2; girls = (father + mother - 13)/2
Open calculator โHexadecimal Calculator
Parse from the source base and render in the target base
Open calculator โHome Loan EMI Calculator
EMI = P x r x (1+r)^n / ((1+r)^n - 1)
Open calculator โIBAN Calculator
Parse from the source base and render in the target base
Open calculator โIRR Calculator
IRR is the discount rate that makes NPV = 0 (found numerically)
Open calculator โIdeal Weight Calculator
Robinson formula plus a BMI 18.5-24.9 healthy range
Open calculator โImport Duty Calculator
Duty = value x duty%; IGST = (value + duty) x gst%; total = value + duty + IGST
Open calculator โInches to Square Feet Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator โIncome Tax Calculator
Tax computed using slab rates; cess = 4% of tax. New-regime FY 2024-25 slabs applied by default.
Open calculator โInteger Calculator
Apply the chosen arithmetic operation to the two numbers
Open calculator โIntegral Calculator
Numeric integration (Simpson's rule) from a to b
Open calculator โInterest Calculator
Simple: P x r x t. Compound: P x (1+r)^t - P
Open calculator โInverse Matrix Calculator
Compute determinant, inverse or transpose of a square matrix
Open calculator โInverse Sine Calculator
Return the inverse trig angle in degrees and radians
Open calculator โInvestment Calculator
Simple: P x r x t. Compound: P x (1+r)^t - P
Open calculator โJulian Date Converter
Convert a Gregorian date to its Julian day number and day-of-year
Open calculator โKilograms to Pounds Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator โLCM Calculator
GCD via Euclid's algorithm; LCM = product / GCD pairwise
Open calculator โLTV Calculator
LTV = average value x purchase frequency x lifespan
Open calculator โLand Area Calculator
Area = length x width; Perimeter = 2 x (length + width)
Open calculator โLand Loan Calculator
EMI = P x r x (1+r)^n / ((1+r)^n - 1)
Open calculator โLaplace Transform Calculator
Symbolic algebra: simplify, expand, differentiate or evaluate the expression
Open calculator โLean Body Mass Calculator
Boer formula for lean body mass
Open calculator โLength Calculator
m = (y2 - y1) / (x2 - x1)
Open calculator โLength Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator โLife Expectancy Calculator
Population-average life expectancy (India, ~70 years) used as a reference, not a personal prediction
Open calculator โLimits Calculator
Symbolic algebra: simplify, expand, differentiate or evaluate the expression
Open calculator โLinear Equation Calculator
x = -b / a
Open calculator โLoan Amortization Calculator
EMI = P x r x (1+r)^n / ((1+r)^n - 1)
Open calculator โLoan Calculator
EMI = P x r x (1+r)^n / ((1+r)^n - 1)
Open calculator โLoan Interest Calculator
EMI = P x r x (1+r)^n / ((1+r)^n - 1)
Open calculator โLogarithm Calculator
log_base(value) = ln(value) / ln(base)
Open calculator โLong Division Calculator
Apply the chosen arithmetic operation to the two numbers
Open calculator โLumpsum Calculator
FV = P x (1 + r)^t
Open calculator โMargin Calculator
Profit = revenue - cost; margin = profit/revenue x 100; markup = profit/cost x 100
Open calculator โMarks Percentage Calculator
Percentage = obtained / total x 100
Open calculator โMarkup Calculator
Price = cost x (1 + markup/100)
Open calculator โMass Calculator
Weight = volume x density
Open calculator โMaterial Weight Calculator
Weight = volume x density
Open calculator โMath Calculator
Safely evaluate the mathematical expression
Open calculator โMath Solver
Safely evaluate the mathematical expression
Open calculator โMatrix Calculator
Compute determinant, inverse or transpose of a square matrix
Open calculator โMatrix Multiplication Calculator
Standard matrix multiplication (columns of A must equal rows of B)
Open calculator โMatrix Solver
Compute determinant, inverse or transpose of a square matrix
Open calculator โMedian Calculator
Sort the values; median is the middle value (or mean of the two middle)
Open calculator โMileage Calculator
Mileage = distance / fuel used
Open calculator โMiles to Kilometers Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator โMilliliters to Liters Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator โMixed Fraction Calculator
Apply the operation, then simplify by the GCD
Open calculator โModulo Calculator
remainder = a - b x floor(a/b)
Open calculator โMoney Calculator
Simple: P x r x t. Compound: P x (1+r)^t - P
Open calculator โMonth Calculator
Count days between two dates and express in multiple units
Open calculator โMultiplication Calculator
Apply the chosen arithmetic operation to the two numbers
Open calculator โMultiplying Fractions Calculator
Apply the operation, then simplify by the GCD
Open calculator โMutual Fund Calculator
FV = P x [((1+i)^n - 1) / i] x (1+i), where i = monthly rate, n = months
Open calculator โNPS Calculator
FV = P x [((1+i)^n - 1) / i] x (1+i), where i = monthly rate, n = months
Open calculator โNPV Calculator
NPV = -initial + sum( CF_t / (1+r)^t )
Open calculator โNational Savings Certificate Calculator
A = P x (1 + r/n)^(n x t); Interest = A - P
Open calculator โNet Worth Calculator
Net worth = total assets - total liabilities
Open calculator โNew Tax Regime Calculator
Tax computed using slab rates; cess = 4% of tax. New-regime FY 2024-25 slabs applied by default.
Open calculator โNon-Programmable Calculator
Safely evaluate the mathematical expression
Open calculator โOhm's Law Calculator
V = I x R; P = V x I (leave the unknown as 0)
Open calculator โPPI Calculator
PPI = sqrt(width^2 + height^2) / diagonal
Open calculator โPPM Calculator
ppm = part / total x 1000000
Open calculator โPPP Calculator
Converted = amount x exchange rate
Open calculator โPaint Calculator
Litres = area x coats / coverage
Open calculator โParallel Resistor Calculator
Series: R = sum. Parallel: 1/R = sum(1/Ri)
Open calculator โPartial Fraction Calculator
Symbolic algebra: simplify, expand, differentiate or evaluate the expression
Open calculator โPayback Period Calculator
Payback = initial investment / annual cash inflow
Open calculator โPayroll Calculator
In-hand = CTC - employer PF - employee PF - professional tax - other deductions (simplified)
Open calculator โPension Calculator
Future monthly expense grows with inflation; corpus = 25x annual expense (4% rule); SIP solves for that corpus.
Open calculator โPercent-Off Calculator
Saving = Price x discount/100; Final = Price - Saving
Open calculator โPercentage Calculator
Result = (percent / 100) x value
Open calculator โPercentage Change Calculator
Change % = (new - old) / |old| x 100
Open calculator โPercentile Calculator
Linear-interpolation percentile of the sorted data
Open calculator โPersonal Loan EMI Calculator
EMI = P x r x (1+r)^n / ((1+r)^n - 1)
Open calculator โPi Calculator
Return pi to the requested number of decimal places
Open calculator โPipe Weight Calculator
Weight = volume x density
Open calculator โPivot Point Calculator
Pivot = (H+L+C)/3; R1 = 2P-L; S1 = 2P-H; R2 = P+(H-L); S2 = P-(H-L)
Open calculator โPost Office Monthly Income Scheme Calculator
Monthly income = principal x rate / 1200
Open calculator โPostal Life Insurance Calculator
Simple: P x r x t. Compound: P x (1+r)^t - P
Open calculator โPounds to Kilograms Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator โPower Calculator
1ph: P = V x I x pf; 3ph: P = sqrt(3) x V x I x pf
Open calculator โPower Consumption Calculator
kWh = power(kW) x hours x days; cost = kWh x tariff
Open calculator โPresent Value Calculator
PV = FV / (1 + r)^t
Open calculator โPresent Value of Annuity Calculator
FV = PMT x ((1+r)^n - 1)/r; PV = PMT x (1-(1+r)^-n)/r
Open calculator โPrice Calculator
Price = cost x (1 + markup/100)
Open calculator โPrime Factorization Calculator
Trial division to express n as a product of primes
Open calculator โProfit Calculator
Profit = revenue - cost; margin = profit/revenue x 100; markup = profit/cost x 100
Open calculator โProfit Margin Calculator
Profit = revenue - cost; margin = profit/revenue x 100; markup = profit/cost x 100
Open calculator โProfitability Index Calculator
PI = PV of future cash flows / initial investment
Open calculator โProgrammable Calculator
Safely evaluate the mathematical expression
Open calculator โProperty Tax Calculator
Property tax = assessed value x rate / 100
Open calculator โProportion Calculator
A/B = C/D => D = C x B / A
Open calculator โProtein Intake Calculator
Protein = weight(kg) x factor (g/kg)
Open calculator โPublic Provident Fund Calculator
Each yearly contribution compounds annually: M = sum of P x (1 + r)^(years remaining)
Open calculator โQuadratic Equation Calculator
x = (-b +/- sqrt(b^2 - 4ac)) / 2a
Open calculator โROI Calculator
ROI = (Final value - Amount invested) / Amount invested x 100
Open calculator โRange Calculator
Range = maximum - minimum
Open calculator โRatio Calculator
Simplify A:B by their GCD; scale proportionally if a target is given
Open calculator โRecurring Deposit Calculator
Each monthly deposit compounds quarterly until maturity; M = sum of P x (1 + r/4)^(quarters remaining)
Open calculator โResistor Calculator
Series: R = sum. Parallel: 1/R = sum(1/Ri)
Open calculator โRetirement Calculator
Future monthly expense grows with inflation; corpus = 25x annual expense (4% rule); SIP solves for that corpus.
Open calculator โReverse Tax Calculator
Net = Gross x 100 / (100 + rate); Tax = Gross - Net
Open calculator โRounding Calculator
Round to the chosen number of decimal places
Open calculator โSGPA Calculator
GPA = sum(grade point x credit) / sum(credit)
Open calculator โSGPA to Percentage Converter
Percentage = CGPA x factor (commonly 9.5 for CBSE)
Open calculator โSWP Calculator
Each month: balance = balance x (1 + r/12) - withdrawal
Open calculator โSalary Calculator
In-hand = CTC - employer PF - employee PF - professional tax - other deductions (simplified)
Open calculator โSalary Hike Calculator
New = Current x (1 + hike/100)
Open calculator โSalary Tax Calculator
Tax computed using slab rates; cess = 4% of tax. New-regime FY 2024-25 slabs applied by default.
Open calculator โSand Calculator
Volume = L x W x D; Weight = volume x density
Open calculator โSavings Account Interest Calculator
A = P x (1 + r/n)^(n x t); Interest = A - P
Open calculator โScale Calculator
Scaled length = real length / scale factor
Open calculator โScientific Calculator
Safely evaluate the mathematical expression
Open calculator โSimple Interest Calculator
SI = P x R x T / 100; Maturity = P + SI
Open calculator โSimplification Calculator
Symbolic algebra: simplify, expand, differentiate or evaluate the expression
Open calculator โSimultaneous Equations Solver
Solve a1x+b1y=c1 and a2x+b2y=c2 by Cramer's rule
Open calculator โSine Calculator
Evaluate sin/cos/tan of the angle (degrees converted to radians)
Open calculator โSlope Calculator
m = (y2 - y1) / (x2 - x1)
Open calculator โSpeed Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator โSpeed-Distance-Time Calculator
distance = speed x time (leave the unknown as 0)
Open calculator โSpending Calculator
Net worth = total assets - total liabilities
Open calculator โSquare Calculator
Area = side^2; Perimeter = 4 x side; Diagonal = side x sqrt(2)
Open calculator โSquare Feet to Square Yards Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator โSquare Footage Calculator
Area = length x width; Perimeter = 2 x (length + width)
Open calculator โSquare Inches to Square Feet Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator โSquare Meter Calculator
Area = length x width; Perimeter = 2 x (length + width)
Open calculator โSquare Root Calculator
result = value^(1/root)
Open calculator โStair Calculator
Steps = round(total rise / ideal riser); riser = total rise / steps
Open calculator โStamp Duty Calculator
Stamp duty = value x rate/100; registration = value x reg rate/100
Open calculator โStatistics Calculator
Compute mean, median, mode, sample standard deviation and range
Open calculator โStock Average Calculator
Average = sum(price x qty) / sum(qty)
Open calculator โStock Profit Calculator
ROI = (Final value - Amount invested) / Amount invested x 100
Open calculator โStudent Loan Calculator
EMI = P x r x (1+r)^n / ((1+r)^n - 1)
Open calculator โSukanya Samriddhi Yojana Calculator
Each yearly contribution compounds annually: M = sum of P x (1 + r)^(years remaining)
Open calculator โSuperannuation Calculator
Future monthly expense grows with inflation; corpus = 25x annual expense (4% rule); SIP solves for that corpus.
Open calculator โSurface Area Calculator
Cube 6a^2; Sphere 4 pi r^2; Cylinder 2 pi r (r + h)
Open calculator โTDEE Calculator
TDEE = BMR (Mifflin-St Jeor) x activity factor
Open calculator โTake-Home Salary Calculator
In-hand = CTC - employer PF - employee PF - professional tax - other deductions (simplified)
Open calculator โTax Bracket Calculator
Tax computed using slab rates; cess = 4% of tax. New-regime FY 2024-25 slabs applied by default.
Open calculator โTax Rate Calculator
Tax computed using slab rates; cess = 4% of tax. New-regime FY 2024-25 slabs applied by default.
Open calculator โTax Return Calculator
Tax computed using slab rates; cess = 4% of tax. New-regime FY 2024-25 slabs applied by default.
Open calculator โTemperature Converter
C to F: F = C x 9/5 + 32; C to K: K = C + 273.15
Open calculator โTime Addition Calculator
Add the hours and minutes to the start time, wrapping over 24h
Open calculator โTime Duration Calculator
Duration = end - start - break (handles crossing midnight)
Open calculator โTime Value of Money Calculator
FV = PV x (1 + r)^t
Open calculator โTime Zone Calculator
Converted = time - fromOffset + toOffset (wrapped over 24h)
Open calculator โTimesheet Calculator
Total hours = hours x days; Pay = total hours x rate
Open calculator โTorque Calculator
Torque = force x lever length
Open calculator โTriangle Area Calculator
Area = 1/2 x base x height
Open calculator โTrigonometry Calculator
Evaluate sin/cos/tan of the angle (degrees converted to radians)
Open calculator โTwo's Complement Calculator
Parse from the source base and render in the target base
Open calculator โUnit Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator โVO2 Max Calculator
VO2 max is about 15.3 x (max HR / resting HR)
Open calculator โVoltage Divider Calculator
Vout = Vin x R2 / (R1 + R2)
Open calculator โVoltage Drop Calculator
Vdrop = 2 x I x (resistivity x length / area)
Open calculator โWACC Calculator
WACC = E/V x Re + D/V x Rd x (1 - tax)
Open calculator โWater Intake Calculator
Base = 35 ml x weight(kg) + activity adjustment
Open calculator โWatts to Amps Calculator
I = P / (V x pf)
Open calculator โWavelength Calculator
wavelength = speed / frequency
Open calculator โWeek Calculator
Count days between two dates and express in multiple units
Open calculator โWeight Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator โWeight Gain Calculator
TDEE +/- calorie adjustment for the goal
Open calculator โWeight Loss Calculator
TDEE +/- calorie adjustment for the goal
Open calculator โWeighted Average Calculator
Weighted average = sum(value x weight) / sum(weight)
Open calculator โWin Rate Calculator
Win rate = won / total x 100
Open calculator โWork Hours Calculator
Duration = end - start - break (handles crossing midnight)
Open calculator โXIRR Calculator
IRR is the discount rate that makes NPV = 0 (found numerically)
Open calculator โYear Calculator
Count days between two dates and express in multiple units
Open calculator โYield Calculator
Current yield = annual income / current price x 100
Open calculator โkVA to Amps Calculator
3ph: I = kVA x 1000 / (sqrt(3) x V); 1ph: I = kVA x 1000 / V
Open calculator โFind calculators by category
DigiToolkit organises 295 calculators into 18 categories. Whether you are planning a loan EMI, checking your BMI, converting units, or solving a maths problem, there is a dedicated tool with clear inputs, instant results and an explanation of the underlying formula.