Math & Scientific
Percentage Increase Calculator
Compare a strictly positive original value with a new value using percentage increase = (new − original) ÷ original × 100. The result identifies an increase, decrease or no change. The form takes two values; it does not take an amount and a percentage rate.
Enter your original value and new value and Percentage Increase Calculator works out the answer with the percentage relationship — fast, free and private, with no sign-up or uploads.
About this calculator
Compare a strictly positive original value with a new value using percentage increase = (new − original) ÷ original × 100. The result identifies an increase, decrease or no change. The form takes two values; it does not take an amount and a percentage rate.
How to use
- Enter a strictly positive original value and a finite new value. Zero or negative original values are outside this ordinary percentage-change model.
- Press Calculate to run the percentage increase calculator.
- Read the result: the percentage increase and the absolute change.
- Press Reset to clear the percentage increase calculator and start again.
Why use Percentage Increase Calculator
Fast
Calculations run in your browser. No round trip to a server.
Private
Your inputs never leave your device. Nothing is uploaded.
Free
No signup, no paywall, no ads-in-results, no watermarks.
Accurate
Based on standard, well-established formulas.
Mobile-ready
Optimised for phones, tablets, and desktops alike.
Transparent
Honest disclaimers wherever browser limits or regional rules apply.
Common uses
Use it for understanding a formula's behaviour
Use it for homework and assignment checks
Use it when comparing two different methods
Use it for science-fair and project numbers
Percentage Increase in research and report calculations
Percentage Increase in competitive-exam practice
Technical notes
Compare a strictly positive original value with a new value using percentage increase = (new − original) ÷ original × 100. The result identifies an increase, decrease or no change. The form takes two values; it does not take an amount and a percentage rate.
Inputs are taken exactly as entered, so check for typos before trusting an answer.
Because it runs locally, results appear instantly with no server round-trip.
Worked example
Going from 80 to 100: the increase is (100 − 80) ÷ 80 × 100 = 20 ÷ 80 × 100 = 25%. The denominator is always the original value, so the same 20-unit change from 100 to 120 would instead be a 20% increase.
FAQ
How is a percentage increase calculated?
As (new − old) ÷ old × 100, shown as an increase when the new value is larger.
What do I enter in the Percentage Increase Calculator?
Enter a strictly positive original value and the new value. A zero or negative starting base is rejected; a negative new value is allowed and represents a decline through zero.
What does a 30% increase look like?
Going from 100 to 130 is a 30% increase.
Does the Percentage Increase Calculator send my data to a server?
No — the Percentage Increase Calculator runs entirely in your browser, so the numbers you enter never leave your device.