Ratio Calculator
Simplify ratios of two or more terms and scale them proportionally.
Calculated locally in your browser. Nothing you enter is uploaded or stored.
- Handles ratios with 3 or more terms (A:B:C:…), not just two-part ratios — for splitting a bill three ways, a recipe with several ingredients, or any multi-way proportion.
- Add or remove terms as needed, up to 6.
- Scale from any term, not just the first — pick which one you know and the rest follow.
Why this is private
- Calculated locally in your browser. Nothing you enter is uploaded or stored.
- Open your browser's DevTools → Network tab while using this tool — you won't see a request carrying your input, because it never leaves your device.
- Nothing you enter is uploaded to a server or shared with us — the processing happens entirely on your device.
Overview
Simplifies a ratio of two or more terms (A:B, A:B:C, and beyond) to its lowest terms and scales it proportionally — enter a new value for any one term to find the rest.
How to use it
- 1Enter each term (add more with "Add term" if you need 3 or more).
- 2View the simplified ratio.
- 3Optionally scale it: pick which term you know a new value for, and see the rest scale proportionally.
Frequently asked questions
What people use it for
Scale a recipe or mixEnter the original ratio and a new quantity for one ingredient to get the rest — including recipes with 3 or more ingredients in ratio.
Work out an aspect ratioReduce a pixel width and height to its simplest ratio like 16:9.
Split an amount three or more ways by a ratioDivide a shared cost, profit, or usage-based bill among 3+ people or categories in a given proportion.
Convert between ratio and fractionSee 3:4 as its lowest terms and reason about it as 3/7 of the whole.
Related guides
- Reduce EMI or reduce tenure after a part payment: which saves more?Both lower your total interest, but not by the same amount. Here's the trade-off, a worked example, and how to compare your own loan.
- How to calculate a home loan foreclosure amountOutstanding principal, accrued interest, charges and tax — what goes into a loan foreclosure (pre-closure) figure, and why the bank's number can differ.
- SIP vs. lumpsum: what the math actually saysSystematic investing and lump-sum investing solve different problems. Here's how to reason about which one fits your situation.
- How to calculate EMI (and why the formula looks so intimidating)A plain-English walkthrough of the EMI formula, what each variable means, and a worked example you can check by hand.
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Ready to use Ratio Calculator?
Ratio Calculator