Three calculation modes
Find a percentage of a number, find what percentage one number is of another, or measure the change between two values.
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Percentage Calculator
Work out percentages, increases, and discounts fast.
🔒 Enterprise privacy — 100% client-side, no server uploads
What next?
What is Percentage Calculator?
Percentage Calculator is a free online tool that lets you work out percentages, increases, and discounts fast. It works in your web browser with no signup. Enter your text or numbers and see the result instantly. Everything you type stays in your browser.
Also searched as: calculate percentage, percent increase calculator, discount calculator, percentage change.
Percentage Calculator at a glance
- Price
- Free, with no paid plans
- Account
- No signup or login needed
- Where it runs
- In your web browser
- Your data
- Nothing you type is sent to a server
- Works on
- Any modern browser, on desktop and mobile
- Category
- Developer & Everyday Calculators
When to use Percentage Calculator
- →Work out a sale discount
- →Find the percentage change between two numbers
- →Calculate a percentage of an amount
How to use Percentage Calculator
- 1
Open Percentage Calculator and fill in the values it asks for.
- 2
The result appears and updates instantly as you change any field.
- 3
Copy the result if you need to paste it elsewhere.
Why use Percentage Calculator
- ✓Runs entirely in your browser — your file is never uploaded to a server.
- ✓No account, signup, or email address required to use it.
- ✓Completely free, with no daily limit and no signup.
- ✓Gives an instant, accurate result without opening a spreadsheet.
Percentage Calculator
Work out percentages without the mental maths
Three common questions in one tool: what is X percent of Y, X is what percent of Y, and what is the percentage change between two numbers.
Instant answers
The answer appears as you type, in plain words.
Increase or decrease
Percentage change tells you whether the move is an increase or a decrease.
Handy for discounts
Find a discount amount with X percent of Y, then subtract it from the price.
Private
Everything is calculated in your browser.
Free, no signup
No account and no limit.
Everything you need in Percentage Calculator
- What is X% of Y
- X is what % of Y
- Percentage change from X to Y
- Says increase or decrease
- Clear plain-language answer
- Runs in your browser
- Works on phone and computer
- Free and no signup
Tips for better results
- 1
Percentage change needs a starting value
If the starting value is 0, a percentage change cannot be worked out, and the tool tells you.
- 2
For a sale price, use two steps
Work out the discount with X percent of Y, then subtract it from the original price.
- 3
Round at the end
Keep the full numbers while you calculate and round only the final answer.
0files uploaded
0signups needed
0cost to use
Tutorials on Percentage Calculator
Short, practical guides that go with this tool.
🔒 Your privacy with Percentage Calculator
Percentage Calculator runs as client-side JavaScript inside your own browser tab. Your file or text is read, processed, and turned into a result on your device — it is never sent to, stored on, or seen by Toolkitties' servers. Closing or refreshing the page clears everything.
Frequently asked questions
How do I calculate a percentage of a number?
Choose what is X percent of Y, then enter the percentage and the number. For example, 20 percent of 150 is 30.
How do I find the percentage change between two numbers?
Choose the change mode and enter the starting and ending values. You get the percentage and whether it is an increase or a decrease.
How do I work out a discount?
Find the discount with X percent of the price, then subtract it from the original price.
Why does it say the starting value cannot be 0?
A percentage change is measured against the starting value, so it cannot be calculated from zero.
Does it work on my phone?
Yes. It works in a phone browser.
Is anything uploaded?
No. Everything is calculated in your browser.
Is Percentage Calculator free to use?
Yes. Percentage Calculator is 100% free, with no signup, no daily limit and no paid plans.
Do I need to create an account to use Percentage Calculator?
No signup or login is required. Open the page and start using Percentage Calculator immediately.
Is it safe to use Percentage Calculator with private or sensitive files?
Yes. Percentage Calculator processes your file locally in your browser using client-side code. The file itself is never uploaded to Toolkitties' servers.