KLOORAHow to Simplify a Ratio and Solve a Proportion
Published 8 November 2026 by Kloora Tools
Quick answer: use the free Ratio Calculator to simplify a ratio or solve a proportion A : B = C : X. It runs in your browser, so nothing you enter is uploaded or stored, and there is no signup.
What is the Ratio Calculator?
Simplify a ratio or solve a proportion A : B = C : X. People often search for it as "ratio calculator", "simplify ratio" or "proportion calculator". This free version works on any phone or computer and needs no download.
How to use the Ratio Calculator
- Open the Ratio Calculator.
- Enter your values in the fields.
- The results update instantly as you type.
- Note or copy the numbers you need.
How it works
To simplify a ratio, divide both parts by their greatest common divisor, so 12:18 becomes 2:3. To solve A : B = C : X, cross multiply to get X = B x C / A. The tool also shows each part as a percentage of the whole.
Worked example
- Input: A: 12; B: 18; C: 20
- Result: Simplified ratio: 2:3; A as a share: 40%; B as a share: 60%; X in A:B = C:X: 30
Common uses
- Scale a recipe or a map
- Mix paint, concrete or fertilizer in the right ratio
- Solve proportion problems
Second worked example
Here is the same tool with larger numbers, so you can see how the result scales.
- Input: A: 18; B: 27; C: 30
- Result: Simplified ratio: 2:3; A as a share: 40%; B as a share: 60%; X in A:B = C:X: 45
Tips for the best result
- Check the units and the order of the numbers before you press anything.
- Estimate the answer roughly in your head first, so you can spot an input mistake.
- Keep more decimal places during the work and round only the final answer.
- Try a simple case you already know to confirm the tool does what you expect.
Common mistakes to avoid
- Swapping two inputs, such as base and exponent or x and y.
- Using degrees where radians are expected, or the other way round.
- Rounding too early and carrying the error forward.
- Entering a percentage as a decimal, or a decimal as a percentage.
Ratio Calculator compared with doing it by hand
| Ratio Calculator | By hand or in a spreadsheet | |
|---|---|---|
| Speed | Instant, results update as you type | Slow, you rebuild the steps each time |
| Accuracy | Same standard method every time | Easy to slip on a formula or a unit |
| Privacy | Runs in your browser, nothing uploaded | Depends on the software you use |
| Cost | Free, no signup | Free or paid software needed |
Try it now
Open the Ratio Calculator and try your own numbers or text. If it helps, share it with someone who needs it.
Frequently asked questions
How do I simplify a ratio?
Divide both numbers by their greatest common divisor. 12:18 becomes 2:3.
How do I solve a proportion?
Cross multiply: if A:B = C:X then X = B x C / A.
What does the Ratio Calculator do?
Simplify a ratio or solve a proportion A : B = C : X.
How do I use the Ratio Calculator?
1. Enter your values in the fields. 2. The results update instantly as you type. 3. Note or copy the numbers you need.
Is my data safe when I use the Ratio Calculator?
Yes. Everything runs in your browser on your own device. Nothing you type or choose is uploaded, stored or shared, and no AI service is used.
Does the Ratio Calculator work on a phone?
Yes. It works on phones, tablets and computers in any modern browser, with nothing to install.
Do I need an account or a payment to use the Ratio Calculator?
No. It is free, has no daily limit, no watermark and needs no signup.
What information does the Ratio Calculator need?
You enter: A, B, C. The results update instantly as you change any value.
How does the Ratio Calculator work?
To simplify a ratio, divide both parts by their greatest common divisor, so 12:18 becomes 2:3.
Can I use this for "simplify ratio"?
Yes. The Ratio Calculator is built for exactly that, and it also answers searches such as "ratio calculator" and "proportion calculator".
How accurate is the Ratio Calculator?
It uses the standard method and shows results to a sensible precision. For legal, medical, financial or safety decisions, confirm important numbers with a qualified professional.
Where can I find more free tools like the Ratio Calculator?
Kloora Tools has over 150 free tools for CVs, PDFs, images, Urdu, calculators and everyday tasks. Browse them all from the home page.
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