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Equivalent Ratio Calculator

Enter ratio terms A and B and a new value for A to get the equivalent value for B.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

Two ratios are equivalent when one can be scaled to the other by multiplying (or dividing) both terms by the same factor — for example, 2:3 and 8:12 represent the same proportion. Given a ratio A:B and a new value for A, this calculator solves for the matching B using B_new = B × (A_new ÷ A), which preserves the original proportion exactly.

This cross-multiplication logic underlies everyday scaling tasks: doubling a recipe while keeping ingredient proportions intact, resizing a map or blueprint, or mixing paint, concrete or chemicals at the correct dilution.

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