Add the numbers for your scenario.
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Percentage Calculator
Percent of, is-what-percent, and percentage change.
100% FreeRuns instantlyNo watermark
- 1Enter detailsAdd the numbers for your scenario.
- 2CalculateVootkit updates the result instantly.
- 3ReviewCheck totals, notes and breakdowns.
Private by designProcessed on your device where possible.
Works on any deviceDesktop, tablet and mobile browsers.
No installationOpen the page and start working.
Always free coreUse the free plan for everyday tasks.
How to use Percentage Calculator
Vootkit updates the result instantly.
02Check totals, notes and breakdowns.
03Copy the answer into your workflow.
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Your work is processed locally in your browser where possible and is never added to a Vootkit upload library.
Learn more about privacyThree different questions get called "percentage", and mixing them up is how a 20% discount followed by a 20% rise fails to return you to where you started.
What Percentage Calculator does
Handles the three percentage questions people actually ask: what is A% of B, A is what percent of B, and what is the percentage change from A to B.
The third is the one that catches people. Percentage change is always measured against the starting value, so the same absolute movement gives different percentages depending on which direction you travel.
The three modes
| A% of B | A tip, a tax, a discount amount |
|---|---|
| A is what % of B | A share of a total — 30 out of 200 is 15% |
| % change from A to B | Growth or decline, measured against the start |
| Change formula | (B − A) ÷ A × 100 |
| Asymmetry | A 50% fall needs a 100% rise to undo it |
| Percentage vs percentage point | 5% to 6% is a 1 point rise, and a 20% increase |
Detailed steps
- Pick which of the three questions you are asking — this is the step that matters.
- Enter the two values.
- Read the result.
Worth knowing
Percentage changes do not cancel out. A price cut by 20% then raised by 20% ends up 4% below where it started, because the rise is calculated on the smaller number. The same arithmetic explains why an investment that falls 50% needs to double to break even.
Frequently Asked Questions
Why does a 20% cut then a 20% rise not return to the original?
Because each percentage is applied to a different base. Twenty percent off 100 is 80; twenty percent of 80 is only 16, so you come back to 96. The second percentage is measured against the reduced figure.
What is the difference between percent and percentage point?
A rate moving from 5% to 6% has risen by one percentage point, and by 20 percent. Both are correct and they describe the same move — which is exactly why the distinction gets exploited in headlines.
How do I calculate a discount plus tax?
Apply them in the order they actually happen: discount first, then tax on the reduced price. The Discount Calculator does both in one step, including a second coupon.
Can percentage change be over 100%?
Yes, whenever something more than doubles — a rise from 10 to 25 is a 150% increase. A decrease cannot exceed 100%, because that would mean ending below zero.
Is Percentage Calculator free?
Yes. The Vootkit free plan includes 5 tool runs a day. Upgrade to Vootkit Pro for unlimited daily use, an ad-free workspace and saved workflows.
Are my files uploaded?
No. Percentage Calculator runs entirely in your browser — your file is processed on your own device and never sent to a server. There is nothing for us to store or delete.
Do I need to install anything?
No. Percentage Calculator works in any modern browser on desktop, tablet or phone. Open the page and start.
How often can I use it? Is there a daily limit?
On the free plan you get 5 tool runs a day. When you reach the limit you'll see a prompt to upgrade, and it resets the next day. Vootkit Pro removes the cap entirely for unlimited daily use.
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This tool processes everything locally in your browser. You can disconnect from the internet after the page loads and it will still work.