How do you calculate a percentage increase on a value?

New value = original × (1 + percent/100), or original + (percent/100 × original). 100 increased by 15% = 115.

Is percentage increase the same as percentage change?

Percentage increase on a value adds a percent to a number. Percentage change compares two values (from A to B).

Percentage Increase Calculator

Increase a starting value by any percentage. Use it for markups, salary raises, growth projections, and “plus X%” problems.

Understanding percentage increase

A percentage increase raises a starting value by a stated percent. It answers “what do I get after adding X%?” — raises, markups, and growth targets.

Good for

Applying a raise, fee, or growth target to a known starting number
Estimating a marked-up amount when you think in “plus X%”
Teaching the (1 + r) multiplier pattern

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Percentage Increase / Decrease

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Increase a starting value by any percentage. Use it for markups, salary raises, growth projections, and “plus X%” problems. Read related guides.

How the increase is applied

New value = original × (1 + percent/100). Increasing 100 by 15% means multiply by 1.15 to get 115. The added amount alone is original × (percent/100).

This is not the same as percentage change between two known values. Here you know the start and the rate; you compute the end. On the change calculator you know start and end; you compute the rate.

Business and personal examples

Salary discussions often use “a 5% raise.” Inventory planning might add a 10% buffer. Pricing sometimes starts from cost plus a markup percent (see also the markup calculator, which focuses on cost/sell/margin language).

Be careful chaining increases: +10% then +10% is not +20% overall, because the second increase applies to the already larger base.

Decrease vs increase

If your story is a reduction, switch to the percentage decrease calculator (multiply by 1 − rate). Using an increase with a negative percent can work mathematically, but a dedicated decrease mode keeps the wording honest for readers and for your own notes.

Worked examples

Example calculations for Percentage Increase
Question	Answer
100 increased by 15%	115
80 increased by 25%	100
50 increased by 10%	55

Formula reference

Goal	Formula
Value after increase	value × (1 + percent/100)

FAQ — Percentage Increase

How do you calculate a percentage increase on a value?: New value = original × (1 + percent/100), or original + (percent/100 × original). 100 increased by 15% = 115.
Is percentage increase the same as percentage change?: Percentage increase on a value adds a percent to a number. Percentage change compares two values (from A to B).

Educational tool only — not tax, legal, or financial advice. Contact us with corrections.

Free calculators for every common percentage problem.