What is the Proportion Calculator?
The proportion calculator is a free online tool that helps you work out proportion quickly and accurately. It uses the standard formula A/B = C/D => D = C x B / A and shows the result instantly as you type, along with a full breakdown so you can see exactly how the answer was reached.
How to use this calculator
- Enter A, B and C in the proportion A:B = C:D.
- See D.
Formula used
A/B = C/D => D = C x B / AExplanation of each input
- A โ the a used in the calculation.
- B โ the b used in the calculation.
- C โ the c used in the calculation.
Understanding your result
- D (unknown) โ the calculated d (unknown).
Step-by-step calculation
For the example values 2:3 = 4:D:
- Apply the formula:
A/B = C/D => D = C x B / A - Substitute the values: D = 4x3/2
- Result: D = 6
Worked example
| Inputs | 2:3 = 4:D |
|---|---|
| Working | D = 4x3/2 |
| Result | D = 6 |
Benefits and practical uses
This calculator saves you time and reduces errors when you need proportion. It is useful for students, professionals and anyone who wants a fast, reliable answer without manual calculation. Results update instantly, work in your browser and can be copied or shared in one click.
Assumptions and limitations
- A not equal to 0.
Frequently asked questions
What is a proportion?
A statement that two ratios are equal.
Disclaimer: Results are provided for general information. Please verify important figures independently.