Percentage Change Calculator
What's the percentage increase or decrease? Calculate the percentage change between two values, add a percentage to a number, or subtract a percentage. Works with any currency.
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How to Use This Calculator
Tab "% Change"
Enter the old value and the new value. The calculator shows the percentage change (positive for an increase, negative for a decrease) and the absolute difference between the two values.
Tab "% Increase"
Enter an original value and the percentage to add. The result shows the new value after applying the increase. Use this for tips, tax markups, salary raises, and price increases.
Tab "% Decrease"
Enter an original value and the percentage to subtract. The result shows the new value after applying the decrease. Use this for discounts, depreciation, and price reductions.
The Formulas
% Change = (New Value − Old Value) / |Old Value| × 100
Percentage increase (add % to a number):
New Value = Original × (1 + Percentage / 100)
Percentage decrease (subtract % from a number):
New Value = Original × (1 − Percentage / 100)
All calculations use standard arithmetic. No country-specific tax rates or adjustments are applied.
Worked Examples
Example 1 — Stock price: $45 to $62
A stock was purchased at $45 and is now worth $62. What is the percentage change?
The stock increased by 37.78%. Every dollar invested at $45 is now worth about $1.38.
Example 2 — Rent: $2,000 to $1,800
Monthly rent dropped from $2,000 to $1,800 after renegotiating the lease.
The rent decreased by 10.0%, saving $200 per month or $2,400 per year.
Example 3 — Revenue: $150,000 to $210,000
A company earned $150,000 last year and $210,000 this year. What is the year-over-year growth?
Revenue grew by 40%, a strong year-over-year performance. The company added $60,000 in new revenue.
Understanding Percentage Change
What Is Percentage Change?
Percentage change measures how much a value has increased or decreased relative to its original amount. It is one of the most commonly used calculations in finance, business, and everyday life — from tracking stock returns and salary raises to comparing prices and measuring growth.
Increase vs Decrease
A positive percentage change means the value went up (increase). A negative percentage change means it went down (decrease). The formula is the same in both cases — the sign of the result tells you the direction automatically.
Percentage Change vs Percentage Points
Percentage change measures relative change between two values. Percentage points measure the absolute difference between two percentages. For example, an interest rate moving from 3% to 5% is a 2 percentage point increase but a 66.7% percentage change. These are different concepts and should not be confused.
Common Uses
Percentage change is used to track investment returns, measure inflation, compare prices, calculate discounts, evaluate business growth, determine salary raises, and analyse year-over-year performance. The "% Increase" and "% Decrease" tabs provide quick shortcuts for the most common scenarios.