Percentage Calculator
* Required fields.
Percentage Calculation
The free Percentage Calculator solves common percentage questions without requiring you to rearrange a formula. Choose the calculation type, enter the known values and review the result.
Find a Percentage of a Number
To find B percent of A, use A × B / 100. For example, 25% of 200 is 50.
Find What Percentage One Number Is of Another
Use A / B × 100. If 30 out of 150 items meet a condition, the proportion is 20%.
Calculate Percentage Change
Use (new value − original value) / original value × 100. A positive result is an increase and a negative result is a decrease. Moving from 100 to 125 is a 25% increase; moving from 125 to 100 is a 20% decrease because the starting values differ.
Add or Subtract a Percentage
To increase a value by B percent, multiply it by 1 + B / 100. To decrease it, multiply by 1 − B / 100. These formulas are useful for price changes, budgets and growth comparisons.
Percentage Points vs. Percent Change
If a rate moves from 10% to 12%, it rises by 2 percentage points but increases by 20% relative to its original level. State which comparison you mean to avoid misleading results.
Rounding
The displayed value may be rounded for readability. Use the unrounded result when later calculations require higher precision.
It uses the values entered in the form to produce an informational estimate for the calculation described on this page.
Yes. You can use the calculator on this page without creating an account, subject to any request limit shown in the interface.
No. Results are estimates. Official platform records, contracts, invoices, legislation and professional advice take priority.
Actual results can differ because rates, rounding, taxes, category rules, service fees or the information entered may vary.
The calculator is designed to process the values needed for the displayed result. Review the site privacy policy for general information about data and cookies.
You can use it as an initial scenario, but important pricing, tax or contractual decisions should be checked against current primary records.
Recalculate whenever a rate, cost, price, platform rule or other important input changes.
Clear the form, confirm the number format and units, then enter the values again. Compare the result with a manual calculation.
No. The page provides general information and a calculation aid; it does not replace legal, tax, accounting or platform-specific advice.
Yes. The form is designed to work on current mobile and desktop browsers.
Use the contact page to share the URL, inputs and the result you expected, without including sensitive information.
Read the explanations on this page and verify current rules through the relevant official source.
