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Percentage increase calculator

By how much a value grew from an old figure to a new one, as a percentage — and the absolute change. A negative result means it actually fell.

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The Percentage increase calculator turns Original value, New value into Increase, Absolute change, instantly and for free. For instance, with Original value = 50 and New value = 75 it returns Increase = 50% and Absolute change = 25.

How to use it

  1. Enter your values: Original value, New value.
  2. Read the result instantly: Increase, Absolute change.

Frequently asked questions

How does the Percentage increase calculator work?

It takes Original value and New value and derives Increase and Absolute change from them. The calculation is live as you type, so the result updates on every change.

Which values does the calculator ask for?

2 values: Original value and New value. Nothing else is required — no account, no file upload.

What does a typical calculation look like?

With Original value = 50 and New value = 75, the calculator returns Increase = 50% and Absolute change = 25. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

How much does the result change with different inputs?

It moves a lot. Using Original value = 100 and New value = 150 instead, Absolute change goes from 25 to 50 — which is why it is worth testing a few scenarios rather than trusting a single figure.

What does it give for smaller values?

Scaled down to Original value = 25 and New value = 38, Increase comes out at 52%. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

The everyday cases: a discount at the till, a rise or fall between two figures, the price before tax, and working backwards from a total.

What is the most common mistake?

Undoing a percentage by applying it again. Take 20% off 100 and you get 80; add 20% to 80 and you get 96, not 100 — the two operations use different bases.

What is the difference between the Percentage increase calculator and the Percentage change calculator?

This one returns Increase and Absolute change; the Percentage change calculator returns Change and Difference. That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Percentage decrease calculator is the closest one after this: How far a value fell from an old figure to a new one, as a percentage — and the absolute drop. A negative result means it actually rose.

What else is worth having open alongside it?

Percentage point change calculator and Percentage difference calculator — they come up in the same task often enough to be worth a second tab.

Further reading

All guides →
ExplainerPercentage Points Are Not PercentMoving from 4% to 5% is a rise of one percentage point and a rise of twenty-five percent. Both statements are true, which is exactly why the ambiguity is so easy to exploit — and why basis points exist.ExplainerStacked Discounts Do Not Add UpTwenty percent off and then a further ten percent off is not thirty percent off — it is twenty-eight, because the second discount applies to the already-reduced price. The general rule, the cases where order matters, and how sales tax changes the answer.ExplainerRelative Risk and Absolute Risk Are Not the Same StoryA headline saying 50% higher risk can describe a change of two-tenths of a percentage point. Both numbers come from the same 2x2 table, and computing both takes one line each — here is how, with a worked example, number needed to treat, and where the odds ratio stops approximating relative risk.How-toPercentage Change: Increase and DecreaseSubtract old from new, divide by the old value, times 100. Here's the formula, why increases and decreases aren't symmetric, and where it's used.How-toHow to Calculate a Percentage: 4 Methods with ExamplesA clear guide to percentages: find X% of a number, work out what percent one number is of another, and add or subtract a percentage — with worked examples.ExplainerPercentage Difference vs. Percentage Change vs. Percentage ErrorThree percentages that look alike but answer different questions. Learn the formula for each, when to use it, and why they give different numbers.