Math Calculators
Percentage Increase Calculator
From price hikes to salary raises to investment growth, percentage change is everywhere. Enter the old and new values to get the percentage increase or decrease
Private by design: this tool runs 100% in your browser. Nothing you enter is sent, stored, or tracked.
How to use this calculator
- Enter the original (old) value.
- Enter the new value.
- See the percentage change, the difference, and whether it's an increase or decrease.
The formula
Percentage change = ((new − old) ÷ old) × 100. A positive result is an increase; negative is a decrease.
Worked example
A salary rising from $60,000 to $66,000: ((66,000 − 60,000) ÷ 60,000) × 100 = 10% increase. A price dropping from $80 to $64 is a 20% decrease.
About this tool
From price hikes to salary raises to investment growth, percentage change is everywhere. Enter the old and new values to get the percentage increase or decrease, the absolute difference, and the formula — instantly.
Frequently asked questions
What's the difference between percentage increase and percentage points?
A rise from 10% to 15% is a 5 percentage-point increase, but a 50% relative increase. Mixing these up is one of the most common statistics mistakes — this calculator gives the relative change.
Can the old value be zero?
No — percentage change from zero is undefined (you'd be dividing by zero). If the starting value is zero, describe the change in absolute terms instead.
How do I calculate a percentage of a number?
That's a different operation: (percent ÷ 100) × number. For example, 20% of 150 = 0.20 × 150 = 30.
Why do prices use this so much?
Discounts, markups, tax, tips, and investment returns are all percentage changes — mastering this one formula covers most everyday money math.