Percentage Increase Calculator
Enter an old and new value and get the percentage increase or decrease, or add a percentage to any number.
The result updates as you type.
From 80 to 100
25% increase
Difference 20 · B is 125% of A · 1.25×
What this page cannot tell you
A percentage change is measured against the starting value, so going up 50% and then down 50% does not return to the start. Percentage points (a change from 5% to 7% is 2 points) are different from percent change (that is a 40% increase).
How to calculate a percentage increase
- Pick the calculation. Percent change, add or subtract a percent, or original before a percent.
- Enter the values. The original and new values, or a value and a percentage.
- Read the result. The percentage, the difference and the ratio.
10 everyday percentage changes
Pay raises
An employee sees that $52,000 to $55,000 is a 5.77% raise.
Rent increases
A tenant works out the percentage of a rent rise.
Price changes
A shopper compares a product's old and new price.
Sales growth
A shop owner sees month-on-month growth.
Weight change
Someone tracks a percentage change in weight.
Stock prices
An investor sees a share's percentage move.
Discounts
A shopper subtracts 25% from a price.
Price before tax or markup
A seller works back to the price before a 20% markup.
Population or survey data
A student calculates percentage change between years.
Utility bills
A household compares this winter's bill with last year's.
How the percentages are worked out
Percentage change = (new − original) ÷ |original| × 100. A positive result is an increase, a negative one a decrease.
Adding p%: value × (1 + p ÷ 100). Subtracting p%: value × (1 − p ÷ 100). The original before a change: new ÷ (1 ± p ÷ 100) — not the new value minus the same percentage.
Limits: a change from 0 has no percentage. Percentage points (5% to 7%) are different from percent change (a 40% increase).
Frequently asked questions
How do I calculate percentage increase?
Subtract the old value from the new, divide by the old value and multiply by 100.
What is the percentage increase from 80 to 100?
25%.
What is the percentage decrease from 100 to 80?
20%. Decreases and increases between the same numbers differ because the base differs.
How do I add 15% to a number?
Multiply by 1.15.
How do I find the original price before a 20% increase?
Divide by 1.2.
What is a percentage point?
The simple difference between two percentages: 5% to 7% is 2 percentage points.
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