Sumbric · everyday math, explained

A percentage calculator that shows its work.

Find a percentage, measure a change, or compare two values. Every answer comes with a readable explanation and the formula behind it.

Percentage Calculator

Make the math legible.
Choose a question, add the numbers, and get the formula with the answer.

Use a value from 0% to 100%.

The number to take a percentage of.

Your answer, in plain numbers.
Your result will appear here.

No mystery math.

The result panel will show the answer and the exact formula used, so you can sanity-check it at a glance.

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Worked examples

Three common questions.
Use these as a quick reference for the conventions behind each mode.

15% of 240

(15 / 100) × 240 = 36

25% increase on 120

Adds 30, so the new value is 150.

40 vs. 60

The symmetric difference is 40%.