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Percent Calculator

Percentages on one screen: what percent, percent change, discounts, tax, and tips.

What do you want to calculate?

B (base)

Favorite it to find it fast on home

When to use it

45 out of 50 → 90%

Salary $3,000 to $3,300 → 10% raise

$50 at 20% off plus a 10% coupon → $36 (28% off)

1Step 1Fill in What do you want to calculate?

2Step 2Change a value and the result updates instantly

3Step 3Save or copy the result

The result looks wrong

Check the units and the baseline first. Changing a value updates the result instantly.

I want the starting values back

Press reset to return to the initial state.

Does it handle sale prices?

Yes. Enter price and discount to see the final price and savings together.

Can I just add the two discounts?

No. Discounts apply in sequence, so 20% + 10% is 28% off, not 30%. Never add the percentages.

Read together
3 Percent Formulas for Daily Life
Ratios, change, and discounts. Three formulas cover nearly every percent calculation.