Percentage Change Calculator Tool – Find Percent Increase or Decrease

Percentage Change Calculator

Measure how much a value increased or decreased, and see both the percent and absolute change.

Instant Results

Original Value

New Value

Increase

Absolute change: 0

Enter values to see the breakdown.

Why percent change matters

Percent change normalizes movement so you can compare growth for different-sized values—perfect for tracking investments, revenue, grades, or fitness progress.

Understanding Percentage Change

Percentage change shows how much a value has increased or decreased relative to where it started. Positive values indicate growth, while negative values show decline.

Formula

Percent Change = ((New Value – Original Value) ÷ Original Value) × 100

Where it helps

📈 Finance

Measure stock performance or quarterly revenue.

🏋️ Fitness

Track weight, reps, or running times over time.

🏫 Academics

See grade improvements between exams.

🛍️ Pricing

Compare price hikes or drops across stores.

Example

Original price $80 → new price $100 = ((100-80)/80) × 100 = 25% increase.
Original weight 200 lbs → new weight 180 lbs = -10% change (loss).

Frequently Asked Questions

Why doesn’t a 20% drop followed by 20% gain return to the original value?

The second percentage uses the new base. Example: 100 – 20% = 80, then +20% of 80 = 96—not 100.

How do I find the original value if I know the percent change?

Original = New ÷ (1 + percent change). For decreases, use a negative percent.

What’s the difference between percent change and percent difference?

Percent change compares a value over time. Percent difference compares two values relative to their average.

Can percent change exceed 100%?

Yes. If revenue doubles, that’s a 100% increase. Tripling is 200%, etc.