Percentage Calculator — Calculate Percentages Instantly
A percentage calculator is one of the most practical math tools for everyday life. Whether you're calculating a discount at the store, figuring out a tip at a restaurant, determining what percent one number is of another, or computing a percentage increase or decrease, this tool makes it fast and effortless.
Our free percentage calculator supports four calculation modes: finding a percentage of a number, determining what number a percentage represents, calculating percentage change between two values, and computing tips with optional bill splitting.
How to Use the Percentage Calculator
- Choose a calculation modeSelect from % of Number, % is What, % Change, or Tip Calculator using the mode pills above the input fields.
- Enter your valuesType the numbers into the input fields. The placeholder text shows an example of what to enter.
- Click CalculatePress the Calculate button or hit Enter to see your result instantly with the formula used.
Frequently Asked Questions
Switch to Tip Calculator mode, enter your bill amount and the tip percentage (e.g. 18% or 20%). You can also split the bill between multiple people. The tool will show the tip amount, total, and per-person cost.
Percentage change = ((New Value - Old Value) / Old Value) × 100. If the result is positive, it's an increase. If negative, it's a decrease.
Use the % is What mode. Enter the percentage in the first field and the "of what number" in the second field. The formula is: Result = (Percentage / 100) × Number.
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