Method
Percent = part ÷ whole × 100. A percentage of a number is percent ÷ 100 × whole. The whole is part ÷ (percent ÷ 100).
Math worksheet
Percentage Calculator
Solve the three common percentage relationships: part as a percent of whole, percent of a number, or the whole from a known part.
The calculation runs locally. Exact-integer tools avoid floating point; decimal and transcendental tools report rounding limits.
Method and verification guide
How the Percentage Calculator works
Percent = part ÷ whole × 100. A percentage of a number is percent ÷ 100 × whole. The whole is part ÷ (percent ÷ 100). The calculator keeps the intermediate values visible so you can reproduce the answer independently.
Interpret the result
A percentage is a dimensionless ratio per hundred; the audit identifies which quantity is the part and which is the reference whole.
Check the assumptions
The reference whole or percentage divisor must not be zero.
Local calculation
Everything runs in this browser. Inputs are not sent to an external calculator.
Rounding
Displayed values may be rounded for readability while calculations use full floating-point precision unless the tool explicitly uses exact integers.
Scope
The reference whole or percentage divisor must not be zero.
Simple by design
Three steps to a clearer number.
Enter your details
Use realistic values in each field. You can change them anytime.
Calculate instantly
The formula runs locally, so there is no account or waiting time.
Use the result
Treat the answer as a practical estimate for your next decision.