---
title: "Proportion Calculator | Solve Equivalent Ratios | XTRAW Tools"
description: "Solve proportions and missing values in equivalent ratios with a free browser-based proportion calculator from XTRAW Tools."
url: "https://xtraw.com/tools/everyday-utilities/proportion-calculator"
date: "2026-05-22T01:10:28+00:00"
language: "en-GB"
---

[Triangle Calculator](https://xtraw.com/tools/calculators/math-calculators/triangle-calculator)[Absolute Value Calculator](https://xtraw.com/tools/calculators/math-calculators/absolute-value-calculator)

 [![Proportion Calculator from XTRAW Tools](https://xtraw.com/images/virtuemart/product/xtraw-proportion-calculator-360x360.jpg)](https://xtraw.com/images/virtuemart/product/xtraw-proportion-calculator-360x360.jpg "Proportion Calculator from XTRAW Tools")

  new

 [Back to: Math Calculators](https://xtraw.com/tools/calculators/math-calculators "Math Calculators")

# Proportion Calculator

 Solve proportions and missing values in equivalent ratios. Use this free browser-based proportion calculator from XTRAW Tools.

 **Proportion Calculator** helps you solve proportions and missing values in equivalent ratios. Use this free browser-based calculator from XTRAW Tools to compare inputs, estimate results, and plan your next step.

## How to Use the Proportion Calculator

1. Enter the required calculator inputs shown in the form.
2. Review the numbers, expression, equation, data set, ratio, date, or measurement assumptions.
3. Run the calculator, then adjust one input at a time to compare scenarios or check your work.

## What This Calculator Helps With

Solve proportions and missing values in equivalent ratios. It is designed for students, teachers, test-prep users, DIY users, and anyone solving equivalent ratios who want a fast, browser-based result before relying on an instructor, textbook, advisor, professional source, healthcare provider, or specialist.

- a: 6
- b: 10
- c: 15

## Common Uses

People use this calculator when they need a quick way to solve math, summarize data, check formulas, compare values, estimate timing, or verify measurement-based results.

- **Math Solving:** Solve school, study, work, or everyday math problems using clear numeric inputs.
- **Measurement:** Use measurements, values, ratios, data sets, or equations to calculate a specific result.

## Formula or Method

For a/b = c/x, x = b × c / a.

## Example

**Example inputs:** a: 6; b: 10; c: 15

**Example result:** Using the default inputs, x = 25.

## Related Tools

- [Ratio Calculator](https://xtraw.com/tools/ratio-calculator)
- [Percentage Calculator](https://xtraw.com/tools/percentage-calculator)
- [Fraction Calculator](https://xtraw.com/tools/fraction-calculator)
- [Quadratic Equation Calculator](https://xtraw.com/tools/quadratic-equation-calculator)
- [Scientific Calculator](https://xtraw.com/tools/scientific-calculator)
- [GCD LCM Calculator](https://xtraw.com/tools/gcd-lcm-calculator)

## Proportion Calculator FAQ

### Is the Proportion Calculator free?

Yes. This calculator is free to use on XTRAW Tools.

### Do I need to create an account?

No. XTRAW tools are designed for browser-based use without requiring an account.

### Are the results exact?

Results may be estimates depending on the inputs, formula, rounding, and purpose of the calculator. Always verify important results before relying on them.

**Disclaimer:** This calculator is provided for general informational and convenience purposes only. It is not legal, financial, medical, pregnancy, fertility, engineering, academic, safety, or professional advice. Always verify important results with a qualified professional, instructor, authoritative source, or appropriate specialist before making decisions.

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