Percentage Calculator
Free percentage calculator: find X% of Y, what percent one number is of another, percentage change, increases, decreases and discounts. Instant and private.
- No upload — 100% private
- Instant, on your device
- Free, no sign-up
- Works offline once loaded
How it works
How to use Percentage Calculator
Find the calculator that matches your question — each card is a sentence you fill in.
Type your numbers; results update instantly.
Use the discount card for sale prices, including stacked extra discounts.
Click the copy icon to grab any result.
Why use it
Why use our Percentage Calculator tool
Five calculators in one
Percent of a number, what percent, percentage change, increase/decrease by %, and discounts.
Plain-English layout
Each calculator reads like a question, so it's obvious which numbers go where.
Stacked discounts
Add an extra percentage off and see the true total discount — not the misleading sum.
Forgiving input
Type 1,250 or 15% — commas and percent signs are understood.
Works offline
Everything is calculated in your browser, with nothing sent anywhere.
FAQ
Frequently asked questions
How do I calculate a percentage of a number?
Divide the percentage by 100 and multiply by the number. For example, 15% of 240 is 0.15 × 240 = 36.
How do I calculate percentage change?
Subtract the old value from the new value, divide by the old value and multiply by 100. Going from 80 to 100 is (100 − 80) ÷ 80 × 100 = 25% increase.
Why doesn't a 10% increase then a 10% decrease get me back where I started?
Because the decrease applies to the larger number. 100 + 10% = 110, and 110 − 10% = 99. Percentages are always relative to their starting value.
Is 20% off plus an extra 10% off the same as 30% off?
No. The extra 10% is taken from the already-reduced price, so the total is 28% off. The discount card shows the real combined discount.
What is the difference between percent and percentage points?
If an interest rate rises from 4% to 5%, it went up 1 percentage point but 25 percent. Use the percentage change card for the relative increase.
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