Percentage Increase Calculator

Find the percentage increase or decrease between two numbers instantly. Includes formula and step-by-step explanation.

No signup required • Instant results • Works on mobile

Percentage Increase Formula

Formula

% Increase = ((New − Old) / Old) × 100

Example: Old = 100, New = 150 → ((150 − 100) / 100) × 100 = 50% increase

Percentage Decrease Formula

Formula

% Decrease = ((Old − New) / Old) × 100

Example: Old = 200, New = 150 → ((200 − 150) / 200) × 100 = 25% decrease

Common Percentage Changes

Old ValueNew ValueChange
100120+20%
100150+50%
100200+100%
200150-25%
500400-20%

How to Use This Percentage Increase Calculator

  1. Enter the original (old) value.
  2. Enter the new value.
  3. See the percentage increase or decrease instantly.

Frequently Asked Questions

How do you calculate percentage increase?

% Increase = ((New − Old) / Old) × 100. From 100 to 150 = 50% increase.

How do you calculate percentage decrease?

% Decrease = ((Old − New) / Old) × 100. From 200 to 150 = 25% decrease.

Difference between percentage increase and percentage point?

Percentage increase is relative change. Percentage point is absolute difference in percentages.

How do you reverse a percentage increase?

Divide new value by (1 + percentage/100). Value after 25% increase = 250 → original = 250/1.25 = 200.

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