Everyday Tools

Percentage Calculator

Calculate what is X% of Y, what percent one value is of another, and percentage increase or decrease.

Updated April 11, 2026
Free online tool
Planning and research use

Why this page exists

If you need to know what percent of a number something is, or how much a price changed in percentage terms, it helps to keep the common formulas in one place. This calculator lets you switch between the four percentage questions people ask most often and get the answer quickly.

Interactive tool

Run the estimate

Enter your numbers and read the result first, then use the sections below to understand what affects the outcome.

Calculator

Percentage calculator

Solve common percentage questions with one calculator.

Result

36.00

15.00% of 240.00 is 36.00.

Result36.00

Percentage15.00%

Base value240.00

One percent of base2.40

Use this mode when you know the percentage and the starting value.
It is helpful for tips, taxes, commissions, discounts, and budget shares.
If you need the percent instead of the result, switch to the second mode.

This tool gives straightforward percentage math for planning, comparisons, and quick checks.

Planning note

Last updated April 11, 2026. Use this tool to compare scenarios and plan ahead, then confirm important details with the lender, employer, insurer, contractor, or other qualified provider involved in the final decision.

How it works

What the calculator is doing

Choose the percentage question you want to solve, such as finding a percent of a number or checking the percentage change between two values.

Enter only the inputs needed for that mode so the form stays focused and the result stays easy to read.

Use the result panel to see the answer, the underlying numbers, and a short explanation of what changed.

Understanding your result

Percentages are most useful when you connect them back to the starting number and the amount changed. That extra context helps when you are checking discounts, raises, budget shares, or any before-and-after comparison.

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Examples

Ways people use this tool

Example scenarios help turn a quick estimate into a more useful comparison or planning step.

Work out a discount or markup

Enter a percentage and a starting price to see how much the discount amount changes the final total.

See what share of a budget is being used

Use the what-percent mode to see what share of a savings target, project goal, or budget category is already complete.

Measure a raise, drop, or price change

Switch to percentage increase or decrease to measure how much a bill, salary, or metric changed from one number to another.

FAQ

Common questions

When should I use percent of a number?

Use percent of a number when you already know the percentage and want the amount, such as finding 15% of a bill or 20% of a budget category.

When should I use what percent one value is of another?

Use that mode when you know the part and the whole and want the percentage back, such as checking what percent of your savings goal is complete.

Why does the calculator show the amount changed as well as the percentage?

The percentage tells you the relative change, while the amount changed shows the real-world size of that change. Seeing both helps with planning and comparison.

Related tools

Keep comparing

Use these related tools to compare nearby scenarios, check a second estimate, or keep narrowing down the right decision.

Everyday ToolsUpdated April 11, 2026