โก Engineering & Electrical Calculators
Explore 18 free engineering & electrical calculators on DigiToolkit. Every tool gives instant, accurate results with the formula and a worked example so you understand the maths behind the answer.
Electrical
View Electrical โCable Size Calculator
Pick the smallest copper cross-section keeping voltage drop within about 3% (simplified)
Open calculator โCurrent Calculator
V = I x R; P = V x I (leave the unknown as 0)
Open calculator โOhm's Law Calculator
V = I x R; P = V x I (leave the unknown as 0)
Open calculator โParallel Resistor Calculator
Series: R = sum. Parallel: 1/R = sum(1/Ri)
Open calculator โResistor Calculator
Series: R = sum. Parallel: 1/R = sum(1/Ri)
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 โWatts to Amps Calculator
I = P / (V x pf)
Open calculator โkVA to Amps Calculator
3ph: I = kVA x 1000 / (sqrt(3) x V); 1ph: I = kVA x 1000 / V
Open calculator โEnergy
Materials
Mechanical
Physics
About engineering & electrical calculations
DigiToolkit's engineering & electrical tools make everyday and professional calculations fast and reliable. Each calculator is built around a generally accepted formula, validates your inputs, and explains the result in plain language. Because everything runs in your browser, your data stays private and results appear the moment you type.
Tips for accurate results
- Use consistent units across related fields.
- Check the worked example on each page to confirm your inputs.
- Read the assumptions โ some calculators use standard rates or methods that may differ from your situation.
Engineering & Electrical calculators โ FAQs
What can I do with the engineering & electrical calculators?
The Engineering & Electrical section on DigiToolkit has 18 free calculators. Each one shows its formula, a worked example and instant results.
Are these calculators free?
Yes. Every calculator is free to use with no sign-up, and runs entirely in your browser.
Do I need to install anything?
No. All calculators work directly in your web browser on mobile and desktop.