Use this free percentage calculator for a clear, instant answer. Enter your numbers and the result updates immediately — no sign-up, everything private in your browser.
The result uses the selected value as the base. Percentage change depends on which number is treated as the original.
A visual summary that updates with your calculation.
Continue with the option that best matches the decision or question behind your result.
Percentage calculator gives an instant estimate from the values entered above. Use the result as a starting point and review the assumptions and limits below.
Enter the requested values, verify units and generate the result. Change one value at a time when comparing cases.
Use one comprehensive percentage calculator instead of separate pages that only swap numbers. Each example shows the base value and the correct operation.
Divide the part by the whole and multiply by 100: 25 ÷ 80 × 100 = 31.25%.
Subtract the original value, divide by the original, then multiply by 100: (65 − 50) ÷ 50 × 100 = 30%.
Multiply 150 by 20% to find a discount of 30. Subtract it from 150 to get a final price of 120 before tax or fees.
Apply each discount to the reduced price. For 20% off followed by 10% off, multiply 0.80 × 0.90 = 0.72, so the combined discount is 28%, not 30%.
A rate rising from 10% to 12% increases by 2 percentage points. Relative to the original 10%, the percentage increase is 20%.
The result depends entirely on the entered values and stated rules.
This tool solves common percentage questions, such as finding a percentage of a number or measuring percentage change.
Percentage of value = rate ÷ 100 × value. Percentage change = (new − old) ÷ old × 100.
20% of 150 is 30. A rise from 100 to 120 is a 20% increase.
The sign of percentage change shows direction: positive for an increase and negative for a decrease.
Percentage change is undefined when the original value is zero. Results may be rounded for display.
Method reference: NIST measurement and unit information. Fynzo explains and implements the calculation independently; the linked organization does not endorse this website.
Reviewed by: Yasser Chahir, Fynzo editor. Last reviewed: July 31, 2026.
