Percentage Calculator
Free online tool
Percentage Calculator
Three ways to work with percentages — calculate instantly as you type. No buttons, no clutter.
What is
% of
?
16
is what percent of
?
12.5%
From
to
+50%
Common examples · tap to try
Understanding percentages
A percentage expresses a number as a fraction of 100. Whether you're working out a discount, an interest rate, or a growth figure, a calculator removes the manual arithmetic so you can focus on the result. This page covers the three calculations people reach for most — and the formulas behind each one.
Where people use it
- Shopping — find how much a sale price actually saves you.
- Finance — interest, tax, tips, and loan repayments.
- School — grades, proportions, and word problems.
- Business — margins, growth rates, and reporting.
The key formulas
Percentage of a number
(percent ÷ 100) × number
What percent
(part ÷ whole) × 100
Percentage increase
((new − old) ÷ old) × 100
Percentage decrease
((old − new) ÷ old) × 100
Why use a calculator
It's faster than reaching for a formula, it removes the chance of a slipped decimal, and it handles every common case from one place. Type your numbers above and the answer updates live — no need to press calculate.
Reference this calculator
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