Percentage Calculator — free online tool
Shop discounts, tip math, grade curves, and “what percent is X of Y” share one screen with three modes so you do not rebuild the formula in a spreadsheet each time.
When to use Percentage Calculator
Use it for sale math, tip estimation, grade curves, and “what percent is A of B” questions that you would otherwise rebuild in Excel every time.
Cross-check anything that affects money or health with a qualified professional or official source.
What Percentage Calculator does not do
It does not compute compound interest, tax brackets, or currency conversion. Use the dedicated EMI, GST, or currency tools for those jobs.
How to use Percentage Calculator
- Select the problem type: percent of a number, what percent one number is of another, or percent change.
- Fill in the values requested for that mode (e.g. 15% of 240, or 80 is what % of 200).
- Run calculate and read the result plus any short explanation on the card.
- Switch mode and try another scenario without leaving the page.
Practical tips
- Switch modes deliberately: "X% of Y" and "X is what % of Y" answer different questions.
- For successive discounts (20% then 10%), apply them one at a time—they do not add up to 30%.
- Percentage increase and decrease are not symmetric; a 50% drop needs a 100% rise to recover.
Example
Mode “percent of”: 15% of 240 → 36. Mode “what percent”: 80 of 200 → 40%.
Related tools on Webtoolshop
- Discount Calculator — Sale price and savings from a percent off.
- GST / Tax Calculator — Tax-inclusive vs exclusive splits.
Limitations
Four arithmetic modes only. Rounding is standard floating-point—banks may round cash differently.
Privacy & data
For this calculator-style page, numbers and dates stay in your browser memory until you leave. They are not saved to our servers.
Frequently asked questions about Percentage Calculator
What does the Percentage Calculator not do?
It does not compute compound interest, tax brackets, or currency conversion. Use the dedicated EMI, GST, or currency tools for those jobs.
Give me a concrete example for the Percentage Calculator.
Mode “percent of”: 15% of 240 → 36. Mode “what percent”: 80 of 200 → 40%.
Can I use the Percentage Calculator for official tax, loan, or medical decisions?
No. Results are simplified estimates for learning and quick checks. Confirm figures with a qualified professional, lender, or government source before filing or signing contracts.
Where does my input go when I use the Percentage Calculator?
For this calculator-style page, numbers and dates stay in your browser memory until you leave. They are not saved to our servers.
Percentage Calculator
Three common percentage problems.