Math Calculator

Percentage Increase Calculator

Enter the original value and the new value to calculate the numeric increase, percentage change, and multiplier.

Calculate increase and percent change

Percentage increase formula

Difference = new value - original value. Percentage increase = difference / original value x 100. Multiplier = new value / original value.

Absolute change

Shows the difference between new and original values.

Percent change

Uses the original value as the comparison base.

Multiplier output

Converts the comparison to a spreadsheet-friendly multiplier.

How to calculate percentage increase

Percentage increase compares a changed value with its starting value. Subtract the original value from the new value first. Then divide that difference by the original value, not the new value, and multiply by 100. Moving from 80 to 100 is an increase of 20; 20 divided by 80 is 25%.

The multiplier gives another way to state the same change. A 1.25x multiplier means the new value is 125% of the original value. This can be practical in forecasts, spreadsheet formulas, price updates, or performance reports where a decimal multiplier is easier to use than a percentage.

When the original value is zero, there is no meaningful percentage-increase base. Report the absolute difference instead and explain the zero baseline. For financial, contractual, regulatory, or scientific reporting, confirm whether negative values and any exclusions should be treated under a separate rule.

Percentage increase calculator inputs

InputWhat it meansPlanning note
Original valueStarting or baseline amountThis is the denominator for percentage change.
New valueUpdated or ending amountUse a value measured in the same unit.
DifferenceNew minus originalA negative result indicates a decrease.
MultiplierNew divided by originalA 1.00x multiplier means no change.

Common use cases

Price updates

Calculate a supplier, subscription, or retail price increase.

Business reporting

Compare revenue, orders, users, or production against a prior period.

Pay review

Translate a wage or salary change into a percentage.

Frequently asked questions

What is the formula for percentage increase?

Subtract the original value from the new value, divide by the original value, then multiply by 100.

Why use the original value as the denominator?

The question asks how much the value changed relative to where it started.

Can the result be negative?

Yes. A negative percentage change means the new value is lower than the original.

What if the original value is zero?

Percent change is not defined from a zero base; use the absolute difference and explain the baseline.

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Last reviewed: September 28, 2026. Results are mathematical estimates based on the values entered. Check source figures, units, rounding rules, tax treatment, and any contractual or financial requirements before using a result for a decision.

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