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Percentage Calculator Online

Solve all percentage problems: find percentages, percentage of a number, and percent change.

1. What is X% of Y?

What is% of=30

2. X is what % of Y?

is=25%

3. Percentage Increase or Decrease

FromTo=+25.0%
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How to Use This Tool

STEP 01

Select Calculation Mode

Choose whether you want to find a percentage of a number or percentage change.

STEP 02

Enter the Values

Fill in the two input numbers.

STEP 03

See the Formula & Result

The answer appears instantly along with the exact mathematical formula.

Key Features & Privacy Guarantee

  • Three vital calculations: X% of Y, Percentage share, and Percentage change
  • Calculates percentage increase and decrease with clear positive/negative tags
  • Instant calculations with live updates on keypress
  • Formatted step-by-step formula explanation for students and professionals

Frequently Asked Questions

How do you calculate percentage increase?

Percentage increase = ((New Value - Old Value) / Old Value) * 100%. If positive, it is an increase; if negative, it is a decrease.

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