Percentage Change Calculator
Calculate percentage increase or decrease between two values.
Percentage Change
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Guide
How it works
Use this calculator to estimate percentage increase or decrease between two values.
What this calculator does
The percentage change calculator helps measure how much a value has changed over time.
It is useful for:
- growth analysis
- pricing comparisons
- business reporting
- performance tracking
Percentage Change Formula
Percentage Change = ((New Value − Old Value) ÷ Old Value) × 100
Where:
- Old Value = starting number
- New Value = ending number
- Percentage Change = increase or decrease as a percentage
Example calculation
If a value changes from 100 to 120:
- Percentage change = ((120 − 100) ÷ 100) × 100
- Percentage change = 20%
What is percentage change?
Percentage change measures the relative increase or decrease between two values.
It shows how much something changed compared with where it started.
Why percentage change matters
Percentage change helps businesses and individuals:
- track growth
- compare performance
- measure price movement
- evaluate trends
When to use this calculator
Use this calculator when you want to:
- compare sales between two periods
- track pricing changes
- measure improvement or decline
- evaluate business growth
Common mistakes
Common mistakes include:
- using the wrong starting value
- confusing change with total percentage
- ignoring context behind the change
Percentage change vs percentage
These are different.
- Percentage shows part of a whole
- Percentage change shows change between two values
Related calculations
You may also want to use:
- Percentage Calculator
- Revenue Growth Calculator
- Price Elasticity Calculator
FAQs
What is percentage change?
Percentage change measures how much a value increased or decreased relative to the original value.
How do you calculate percentage change?
Percentage Change = ((New Value − Old Value) ÷ Old Value) × 100.
Why is percentage change important?
It helps compare performance, trends, and changes over time.
Can percentage change be negative?
Yes. A negative result means the value decreased.
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