Percentage Decrease Calculator

Find the percentage decrease between an original value and a new value.

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Percentage Decrease Calculator: The Complete Guide

Find out how much something has fallen in percentage terms. Enter the original value and the new value to see the percentage decrease and the size of the drop.

Who the Percentage Decrease Calculator is for

Anyone measuring a drop — discounts, declines, or reductions of any value.

How to use the Percentage Decrease Calculator

  1. Type your values into the fields above — pick your currency or units where the calculator offers them.
  2. Results update automatically as you type; there's no submit button and nothing is sent to a server.
  3. Adjust any input to compare scenarios, then copy the result with a single click.

How it works

Percentage decrease = (original value − new value) ÷ original value × 100. A negative result means the value actually increased.

Features

  • Percentage decrease
  • Change in value
  • Handles increases too
  • Instant result

Measuring a drop

A percentage decrease expresses how much a value has fallen relative to where it started. A drop from 100 to 75 is a 25% decrease. If the new value is actually higher, the calculator reports a negative percentage, signalling an increase instead.

Frequently Asked Questions

What if the value went up instead?

Then the calculator shows a negative percentage, meaning an increase. Use the percentage increase calculator for a positive growth figure.

Is a 50% decrease the opposite of a 50% increase?

No — they don't cancel. A 50% increase then a 50% decrease leaves you at 75% of the original, because each percentage is taken from a different base.

Is this calculator free and private?

Yes. It's completely free with no signup, and every calculation runs locally in your browser, so your numbers never leave your device.

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