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Free Online Percentage Change Calculator

Measure relative change from an original value.

Your input stays on this device. Processing is bounded; regex runs in a worker with a two-second timeout.

Result

How to use Percentage Change Calculator

Measure relative change from an original value. A zero original value is rejected. Negative originals use the absolute original as the denominator. State this convention when comparing losses or negative balances.

  1. Set Original value.
  2. Set New value.
  3. Run the tool, review the result and its stated limitations, then copy or download if needed.

Example & practical use

Measure relative change from an original value. The example below demonstrates Original value; New value.

Example input:
{
  "a": 80,
  "b": 100
}
Expected result (relevant fields):
{
  "result": 25
}

Features & result limitations

A zero original value is rejected. Negative originals use the absolute original as the denominator. State this convention when comparing losses or negative balances.

Frequently asked questions

What inputs does Percentage Change Calculator accept?

Original value; New value

How should I interpret the Percentage Change Calculator result?

A zero original value is rejected. Negative originals use the absolute original as the denominator. State this convention when comparing losses or negative balances.

Where does Percentage Change Calculator process my data?

Inputs are processed locally in your browser. Submitted text is not sent to external services. A successful-run event increments an aggregate tool counter without your input.

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