Percentage Calculator
Calculate percentages, percentage of a value, percentage change, and more.
Calculated locally in your browser. Nothing you enter is uploaded or stored.
- Free — no signup, no account, no watermark
- Runs entirely in your browser — nothing is uploaded to a server
- Works on mobile, tablet and desktop
- Instant — results appear as soon as you enter your input
Why this is private
- Calculated locally in your browser. Nothing you enter is uploaded or stored.
- Open your browser's DevTools → Network tab while using this tool — you won't see a request carrying your input, because it never leaves your device.
- Nothing you enter is uploaded to a server or shared with us — the processing happens entirely on your device.
Overview
Five common percentage calculations in one tool: finding X% of a number, finding what percent one number is of another, solving for the base number, finding the percentage change between two numbers, and finding the symmetric percentage difference between two numbers.
How to use it
- 1Pick the calculation you need from the tabs.
- 2Enter the values.
- 3The result updates instantly.
Formula
X% of Y
result = (X / 100) × Y
X is what % of Y
result = (X / Y) × 100
X is P% of what number
result = X / (P / 100)
Percentage change
result = ((To − From) / From) × 100
Percentage difference
result = (|A − B| / ((A + B) / 2)) × 100
Frequently asked questions
What people use it for
Work out a tip or a shareFind 18% of a bill, or what portion one figure is of a total.
Calculate a percentage changeSee the percent increase or decrease between an old and a new value.
Check a discount or markupConfirm what percentage a price reduction represents.
Find the whole from a known part and percentage"30 is 15% of what number?" — solve for the base value directly instead of doing the algebra by hand.
Compare two figures with no clear before/afterUse percentage difference (not change) for two survey results, two estimates, or any pair where neither is naturally the "starting" value.
Convert a fraction to a percentage"7 out of 40" as a percent for a score or completion rate.
Related guides
- Reduce EMI or reduce tenure after a part payment: which saves more?Both lower your total interest, but not by the same amount. Here's the trade-off, a worked example, and how to compare your own loan.
- How to calculate a home loan foreclosure amountOutstanding principal, accrued interest, charges and tax — what goes into a loan foreclosure (pre-closure) figure, and why the bank's number can differ.
- SIP vs. lumpsum: what the math actually saysSystematic investing and lump-sum investing solve different problems. Here's how to reason about which one fits your situation.
- How to calculate EMI (and why the formula looks so intimidating)A plain-English walkthrough of the EMI formula, what each variable means, and a worked example you can check by hand.
Related tools
All finance toolsDiscount CalculatorCalculate the final price after a percentage or flat-amount discount — solve for any field.GST CalculatorAdd or remove GST from an amount, with the correct CGST+SGST or IGST split.Average CalculatorCalculate the mean, median, mode and range of a list of numbers.EMI CalculatorCalculate your monthly EMI, full amortization schedule, and part-payment or foreclosure savings.
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Percentage Calculator