🔄 Percent Change Calculator

Calculate the overall change (increase or decrease) between two values — in percentage.

💡 What Is Percent Change?

It tells you how much a value has changed over time, either up 📈 or down 📉, as a percentage of the original value.

🔄 Percent Change Calculator

📊 Calculation Breakdown

Initial Value Final Value Difference Percent Change Change Type Multiplier

🧮 Percent Change Formulas

Basic Formula

% Change = [(Final - Initial) ÷ |Initial|] × 100

Example: Initial = 100, Final = 150
[(150 - 100) ÷ 100] × 100 = 50% increase

Example: Initial = 100, Final = 75
[(75 - 100) ÷ 100] × 100 = 25% decrease

Reverse Calculation

Initial Value = Final ÷ (1 + %Change/100)

For increases: Final = 150, Change = +50%
150 ÷ (1 + 50/100) = 100

For decreases: Final = 75, Change = -25%
75 ÷ (1 - 25/100) = 100

Multiplier Method

Final Value = Initial × (1 + %Change/100)

For increases: Initial = 100, Change = +50%
100 × (1.5) = 150

For decreases: Initial = 100, Change = -25%
100 × (0.75) = 75

💡 Common Percent Change Examples

Scenario Initial Final Change Type
Stock price $50 $65 +30% Increase
Temperature 80°F 68°F -15% Decrease
Population 1,000 1,200 +20% Increase
Test score 80 points 72 points -10% Decrease

💡 Percent Change Tips

  • Positive result indicates an increase, negative indicates a decrease
  • When initial value is negative, interpret results carefully
  • For repeated changes, use multipliers (e.g., 10% increase then 10% decrease ≠ 0% change)
  • Percent change is relative to the initial value (50 → 75 is +50%, 100 → 125 is +25%)

🧠 Formula

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

🧮 Example

  • Original Value: 1,000

  • New Value: 850

  • 👉 Percent Change = ((850 - 1000) ÷ 1000) × 100 = -15%
    ✔️ So, the value decreased by 15%.

✅ Best For:

  • Comparing prices or sales

  • Measuring business growth or loss

  • Tracking score or performance changes

  • Monitoring weight, expenses, or profits

📊 Why Use This Calculator?

  • ⚡ Fast and simple

  • 📱 Works on all devices

  • 🧠 No math required

  • 💯 Accurate and free

🔁 Want to focus on increase or decrease only?

Try these:
👉 Percentage Increase Calculator
👉 Percentage Decrease Calculator

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