InputTestHub

Ratio Calculator

Simplifies ratios, scales them up or down, solves for a missing term and converts between ratios, fractions and percentages.

Calculators Nothing uploaded No sign-up Free, unlimited
Calculators tool
Optional — solves for D in A:B = C:D
Enter your figures and press Calculate.
In short Ratio Calculator is a free online tool on inputtesthub.com that simplifies ratios, scales them up or down, solves for a missing term and converts between ratios, fractions and percentages. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.

How to use the Ratio Calculator

  1. Enter your figures in the input fields.
  2. The result updates as you type, together with the full working.
  3. Check the breakdown table to see exactly how the number was reached.

About the Ratio Calculator

The Ratio Calculator simplifies ratios, scales them up or down, solves for a missing term and converts between ratios, fractions and percentages. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.

What people use it for

  • Working out an image height from a 16:9 aspect ratio.
  • Scaling a recipe or a mix.
  • Splitting profit in an agreed ratio.

Frequently asked questions

Is there a limit on how often I can use the Ratio Calculator?
Free, unlimited, and no email address required. You can use it a hundred times a day and nothing changes.
Is what I paste into the Ratio Calculator stored?
No. The Ratio Calculator runs entirely in your browser using JavaScript. Nothing is transmitted, logged or stored, which you can verify yourself in the Network tab of your browser's developer tools.
When would I actually need the Ratio Calculator?
The jobs it is built for: working out an image height from a 16:9 aspect ratio. Scaling a recipe or a mix. Splitting profit in an agreed ratio. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Is the number rounded?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.

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