Percentage Increase Calculator | Free % Change & CAGR Tool
Calculate the percentage increase or decrease between two values, find the compound annual growth rate (CAGR) for multi-year periods, and reverse-calculate the original value before a percentage change. Includes visual comparison bars, growth factor multipliers, and auto-generated insights.
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Read our complete guide to the Percentage Increase Calculator — with real-world examples, expert insights, and pro tips.
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Calculator Features
% Increase / Decrease
Enter original and new values to find the percentage change. Shows increase or decrease with absolute difference, growth factor multiplier, and auto-generated insight about the magnitude of change.
CAGR Calculator
Calculate the Compound Annual Growth Rate over multiple years. Enter starting value, final value, and time period to get the annualized growth rate with compound verification.
Reverse % Change
Find the original value before a percentage increase or decrease. Perfect for reverse-engineering discounts, markups, or historical pricing.
Growth Factor Display
Every result includes the growth factor multiplier. A 100% increase shows as 2.00×, a 50% increase as 1.50× — intuitive for understanding compound effects.
Visual Bars
Color-coded comparison bars show the original value versus the change amount (green for increase, red for decrease, blue for original).
Contextual Insights
Auto-generated insights explain what the percentage change means in real terms. CAGR results include market context based on the growth rate magnitude.
How to Use
Calculate Percent Change
- Select the '% Increase / Decrease' mode tab
- Enter the original (starting) value
- Enter the new (ending) value
- See the percentage change with +/- sign
- Check the growth factor and absolute difference
Calculate CAGR
- Select the 'CAGR' mode tab
- Enter the starting value (e.g., initial investment)
- Enter the final value (e.g., ending portfolio value)
- Enter the number of years
- See the annualized growth rate with compound verification
Find Original Value
- Select the 'Reverse % Change' mode tab
- Enter the new value (after change)
- Choose Increase or Decrease
- Enter the percentage change amount
- See what the original value was before the change
Use Quick Presets
- In % Increase mode, use preset buttons for common changes
- Click '+25%' to instantly see what a 25% increase looks like
- Presets range from 10% to 500%
- The growth factor automatically updates with results
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Formula Guide
% Increase
((New − Original) ÷ Original) × 100
((150 − 100) ÷ 100) × 100 = 50% increase
% Decrease
((Original − New) ÷ Original) × 100
((100 − 75) ÷ 100) × 100 = 25% decrease
CAGR
((Final ÷ Start)^(1/Years) − 1) × 100
((20000 ÷ 10000)^(1/5) − 1) × 100 = 14.87%
Reverse %
New ÷ (1 ± % ÷ 100)
150 ÷ (1 + 25 ÷ 100) = 120
Reviewed by Emily Watson, M.Ed.
Mathematics EducatorMathematics teacher and curriculum designer with 15+ years of experience.
Percentage Increase Calculator Pros & Cons
Pros
- ✅ Increase, decrease, CAGR & reverse modes
- ✅ Step-by-step formula display
- ✅ Instant results for any values
- ✅ Free forever — no subscriptions
- ✅ Works offline after page load
Cons
- ✗ No multi-period CAGR charting
- ✗ No batch/inflation adjustment
Frequently Asked Questions
How do I calculate percentage increase?
Percentage increase = ((New Value − Original Value) ÷ Original Value) × 100. For example, if a stock rises from $50 to $75: ((75 − 50) ÷ 50) × 100 = 50% increase.
How do I calculate percentage decrease?
Percentage decrease = ((Original Value − New Value) ÷ Original Value) × 100. For example, if a price drops from $80 to $60: ((80 − 60) ÷ 80) × 100 = 25% decrease.
What is the difference between percentage increase and percentage change?
Percentage change is the broader term that includes both increases and decreases. Percentage increase specifically refers to positive changes where the new value is higher.
What is CAGR and how is it different from simple growth?
CAGR (Compound Annual Growth Rate) is the mean annual growth rate that would produce the observed growth if applied consistently each year. It accounts for compounding over time.
How do I reverse-calculate the original value after a percentage increase?
Original Value = New Value ÷ (1 + Percentage ÷ 100). For example, if an item now costs $150 after a 25% increase: Original = 150 ÷ (1 + 0.25) = $120.
What is a growth factor and how do I use it?
The growth factor is the multiplier that shows how many times the original value grew. A 100% increase = 2.00× growth factor (doubled). A 25% increase = 1.25×.
Want to Learn More?
Check out our comprehensive guide for in-depth explanations, real-world examples, and expert tips.
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