Percentage Change Calculator
Calculate the percentage increase or decrease between two numbers.
Results update as you type.
About this calculator
A percentage change calculator finds how much a value has gone up or down in percent terms between an original and a new number, plus the raw difference. Subtract the original from the new value, divide by the original, and multiply by 100 — a positive result is an increase and a negative one a decrease.
For example, a price rising from 200 to 260 is a change of (260 − 200) ÷ 200 × 100 = 30%, with a raw difference of 60. Reverse it and 260 falling back to 200 is about a −23% change, because the same 60 gap is now measured against the larger starting figure of 260.
Use it for price rises and cuts, salary changes, investment gains and losses, weight change, exam improvement or any before-and-after comparison where you want both the percentage and the actual amount of the change.
Frequently asked questions
How do I calculate percentage change?
Subtract the original from the new value, divide by the original, and multiply by 100. From 200 to 260 is (260−200)/200 × 100 = 30% increase.
What does a negative result mean?
A negative percentage change means the value decreased. From 260 to 200 is a −23% change.
How do I calculate a percentage increase?
Take the increase (new minus original), divide by the original, and multiply by 100. Going from 50 to 75 is a rise of 25, so 25 ÷ 50 × 100 = a 50% increase.
How do I calculate a percentage decrease?
Take the drop (original minus new), divide by the original, and multiply by 100. Falling from 80 to 60 is a drop of 20, so 20 ÷ 80 × 100 = a 25% decrease.
Why isn’t a rise and fall by the same percent symmetrical?
Because the two changes are measured against different starting points. A 30% rise from 200 to 260 does not reverse with a 30% fall — dropping 260 back to 200 is only a 23% decrease, since 260 is the larger base.
What is the difference between percentage change and percentage points?
Percentage change is relative to the starting value, while percentage points are an absolute gap between two percentages. A rate going from 4% to 6% is a rise of 2 percentage points but a 50% percentage change.
API — use this calculator from code
Call this calculator as a free JSON endpoint — no key required. Send the field values below as query parameters or JSON. Read the full API docs →
Endpoint
GET https://calculator.free/api/v1/percentage-change/curl
curl "https://calculator.free/api/v1/percentage-change/?from=200&to=260"JavaScript fetch()
const r = await fetch(
"https://calculator.free/api/v1/percentage-change/?" + new URLSearchParams({
"from": "200",
"to": "260"
}));
const data = await r.json();
console.log(data.results);Results are estimates for general guidance only, not financial, medical or tax advice.