Ratio Calculator

Scale a two-part ratio while keeping both sides proportional.

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Enter your numbers.

Behind the answer

How to calculate

New second value = new first value × second ratio ÷ first ratio

Scaling 3:5 to a first value of 12 gives 12:20.

This scales equivalent ratios; it does not calculate financial debt-to-income ratios.

Results display up to 8 decimal places; exported numbers preserve calculation precision. This is a calculation summary, not an official certificate.