Percentage Change Calculator

Find the percentage increase or decrease from an original value to a new value. The result updates as you type and shows the complete formula.

Percentage change divides the difference by the absolute original value. This keeps increase and decrease direction meaningful for both positive and negative starting values.

Five percentage calculations

• Percent of calculates a percentage of a given number.
• What percent finds what percentage one value represents of another.
• Reverse percent finds the whole when a value and its percentage are known.
• Percent change compares a new value with its original value.
• Convert percent returns the equivalent decimal and simplified fraction.

Percentage change uses the absolute original value as the denominator, so direction remains meaningful when values are negative. A positive result is an increase and a negative result is a decrease. Change from an original value of zero is undefined because division by zero has no finite percentage result.

Related percentage calculations: Percentage Calculator · Percentage Change · Reverse Percentage · Percent to Decimal