Percentage Calculator
Calculate percentages online: what is X% of Y, percentage increase, decrease and change between two numbers. Free percentage calculator for discounts and growth.
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Pro Tip
Use the Change mode to calculate year-over-year growth or stock market fluctuations instantly.
About this tool
Work out any percentage relationship — what percent X is of Y, a value after a percentage change, or the increase between two numbers — without spreadsheet detours. Discounts, raises, tips, and growth rates all resolve in a keystroke.
How to Calculate Percentages
- 1
Choose the question you're asking: percent-of, percentage change, or what a number becomes after an increase or decrease.
- 2
Enter the two values involved — the calculation runs instantly as you type.
- 3
Read the answer, and flip to a related calculation without re-entering numbers.
Why Calculate Percentages with Wrklyst
- Instant and On-Device
- Pure browser arithmetic with live results — nothing to submit and no figures sent anywhere.
- Every Direction Covered
- Percent-of, change-between, and after-change are different formulas people routinely mix up; each has its place here.
- Frictionless for Small Math
- The calculation is faster than opening a spreadsheet and remembering which cell divides which.
Percentage Sense
- Reverse-check discounts: price × (100 − discount)% should equal the tag — catch register errors.
- X% of Y equals Y% of X — 8% of 25 is 25% of 8, which is 2. Pick the easier direction.
- Tip math shortcut: 10% is one decimal shift; 20% is that doubled.
- Comparing growth rates? Confirm both use the same baseline period, or the comparison is fiction.
Frequently asked questions
How do I calculate a percentage increase correctly?
Divide the change by the original value — not the new one — then multiply by 100: from 80 to 100 is (20 ÷ 80) × 100 = 25% increase. Dividing by the new value instead (20 ÷ 100 = 20%) is the most common percentage mistake in the wild, and it flatters every growth figure.
Why doesn't a 50% drop then 50% rise get back to the start?
Because each percentage applies to its own base: 100 falling 50% hits 50, and 50 rising 50% reaches only 75. Percentage changes compound against shifting baselines — the reason a market that 'recovered by 40%' after a 40% crash is still down, and why investors get fooled by symmetric-sounding swings.
What's the difference between percentage points and percent?
An interest rate moving from 4% to 6% rose two percentage points but 50 percent — both true, wildly different impressions. News and marketing exploit the ambiguity constantly. When precision matters, say 'points' for absolute differences between percentages and reserve '%' for relative change.
How do stacked discounts combine?
Multiplicatively, not additively: 20% off then 10% off is 0.8 × 0.9 = 0.72 — a 28% total discount, not 30%. Each successive discount applies to the already-reduced price. Retailers know shoppers add them; now you know to multiply.