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Percentage calculator
Find a percentage, a share, or a percentage change.
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How to use Percentage calculator
Choose the percentage calculation that fits your question: a percentage of a value, one value as a percentage of another, or change from an original value to a new one. The selected mode determines how the two inputs are interpreted. Review the labels before calculating so the original and comparison values are in the right places.
01
Choose a calculation mode
Select percentage of, percentage share, or percentage change.
02
Enter both values
Provide the two numbers in the order shown by the mode.
03
Calculate and check
Read the result and confirm that you chose the intended base value.
COMMON QUESTIONS
Percentage calculator: useful answers
What is the base for percentage change?
For a nonzero original value, the tool calculates (new minus original) divided by the absolute value of original, multiplied by 100. Using an absolute base also defines how negative starting values are handled.
Can a percentage share or change use a zero base?
No. Those calculations divide by the base value, so a zero base produces an error rather than a meaningful percentage.