Instantly calculate percentage growth or decline between two values. Perfect for financial analysis, sales tracking, and academic purposes.
Percentage change measures the relative difference between an original value and a new value. It's commonly used to track growth or decline in various contexts like business, finance, and academics.
Follow these steps:
Let's say your monthly revenue increased from $5,000 to $6,500. Here's how to calculate the percentage change:
Step 1: Subtract original value from new value: 6,500 - 5,000 = 1,500
Step 2: Divide by original value: 1,500 ÷ 5,000 = 0.3
Step 3: Multiply by 100: 0.3 × 100 = 30%
Result: You experienced a 30% increase in revenue.
Our Percentage Change Calculator offers several advantages:
Whether you're analyzing sales data, tracking investment performance, or comparing academic scores, this tool provides quick and reliable results.
Percentage change measures how much a value has grown or shrunk relative to where it started. Raw differences can mislead: an extra £500 means one thing on a £2,000 salary and something else entirely on a £50,000 salary. Percentage change puts both on the same footing, which is why it is the standard way to describe price rises, sales growth, exam-score movement and investment performance. This calculator takes an original value and a new value and returns the change as a percentage, colour coded — green for an increase, red for a decrease — using the standard formula:
Percentage change = ((new value − original value) ÷ original value) × 100
A shop raises a jacket’s price from £80 to £100. The change is (100 − 80) ÷ 80 × 100 = a 25% increase. A student’s test score climbs from 64 to 80 marks: (80 − 64) ÷ 64 × 100 = a 25% increase — the same headline figure from completely different numbers, which is exactly the point of working in percentages. In the other direction, a freelancer’s monthly income dropping from £4,000 to £3,800 is (3,800 − 4,000) ÷ 4,000 × 100 = a 5% decrease. And a website whose visitors grow from 1,200 to 1,530 a month has gained (1,530 − 1,200) ÷ 1,200 × 100 = a 27.5% increase.
One distinction is worth keeping straight, because the two are often confused: percentage change always compares a new value against the original one. If neither number is the “original” — comparing two exam years, say — percentage difference, which compares both against their average, is the fairer measure, and there is a separate calculator for it below. Everything here runs instantly in your browser; nothing you enter is sent or stored. Free, with no sign-up.
Related: if you only need the increase on its own, use the Percentage Increase Calculator; for comparing two values with no starting point, the Percentage Calculator includes percentage difference; and for adding or removing tax instead, try the GST Calculator.
((New value − original value) ÷ original value) × 100. Subtract the original from the new value, divide by the original, then multiply by 100.
It is the same formula. If the new value is bigger than the original, the result is positive — that is your percentage increase. A rise from 80 to 100 gives (20 ÷ 80) × 100 = 25%.
Also the same formula. If the new value is smaller, the result comes out negative, and the calculator shows it in red as a decrease — for example 4,000 down to 3,800 is a 5% decrease.
Change compares a new value to the original starting value. Difference compares two values against their average, and is used when neither value is the starting point.