Proportion Percentage Calculator

Solve proportion and percentage problems: find what percent A is of B, what is A% of B, or A is B% of what number.

What is a Proportion Percentage Calculator?

A proportion percentage calculator solves three common problems: (1) A is what percent of B? (2) What is A% of B? (3) A is B% of what number? These are the core proportion and percentage relationships used in maths, finance, and everyday calculations.

Proportions express the relationship between a part and a whole; percentages express that relationship as a number out of 100.

How to Use

  1. Choose the type of proportion: part as % of whole, find part from %, or find whole from part and %.
  2. Enter the two known values in the correct fields.
  3. Click "Calculate" to see the result.

Related Calculators

Percentage Calculator →Ratio Percentage Calculator →Split Percentage Calculator →

Cite This Calculator

Reference this calculator on your website or in your work using the citation below:

HTML Citation Code:

<p>Calculator: <a href="https://onlinecalculator.co.uk/percentage/proportion-percentage-calculator" target="_blank">Proportion Percentage Calculator</a> - OnlineCalculator.co.uk</p>

APA Style Citation:

OnlineCalculator.co.uk. (2025). Proportion Percentage Calculator. Retrieved from https://onlinecalculator.co.uk/percentage/proportion-percentage-calculator

Note: This calculator is free to use and reference. No permission required for educational or commercial citation.