Math calculator
Percentage Calculator
Find what percentage one number is of another.
About the percentage calculator
The percentage calculator finds what percentage one number is of another.
How to use this calculator
- 1
Enter part and whole
Enter the part value and the whole value.
- 2
View results
See the percentage.
How the calculation works
Percentage = (part ÷ whole) × 100. The whole cannot be zero.
Example: 25 is 20% of 125.
When to use a calculator vs. mental math
Simple operations like percentages and proportions are great for mental math. Complex problems — quadratic equations, standard deviation, and base conversions — benefit from calculator precision. Always estimate the answer first to catch input errors, and verify results with a second method when possible.
Important limitations
This tool provides a mathematical estimate based only on the values entered. It does not account for regulations, taxes, lender fees, market conditions, or individual circumstances. Results are for planning purposes only — consult a qualified professional for regulated, medical, financial, or construction decisions.
Frequently asked questions about percentage calculator
How accurate is the percentage calculator?+
The calculation follows the displayed formula and retains full numeric precision before formatting the result.
Can I use the result professionally?+
Use it as a planning estimate. Confirm regulated, medical, financial, or construction decisions with a qualified professional.