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Mathematics

Percentage change

Percentage change: enter your values and get an instant free result.

Your result

Complete the fields and calculate.

Calculation method and formula

(New value − Old value) ÷ Old value × 100

Understand the inputs

Old value
Use a measured value or your own assumption.
New value
Use a measured value or your own assumption.

Assumptions and limitations

The starting value is the reference and must not be zero. A total return across the entered period is not automatically an annualized return.

The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation.

Worked example

Illustrative values. Replace them with your own inputs for your calculation.

Old value
80
New value
100
Example result25 %

The result was calculated directly from your entries.

Model revision: October 17, 2026 · How CleverCalc works

FAQ

Frequently asked questions

How does Percentage change work?+

(New value − Old value) ÷ Old value × 100. The starting value is the reference and must not be zero. A total return across the entered period is not automatically an annualized return.

What assumptions should I consider for this result?+

The starting value is the reference and must not be zero. A total return across the entered period is not automatically an annualized return. The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation.

How accurate is the result?+

The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation. Prices, measurements and model assumptions determine how well the result represents your situation.

Is this calculator free?+

Yes. Calculations and PDF export work without an account or registration.

What happens to my inputs?+

Calculations run in your browser. Results are saved locally only when you add them to My results; favourites and history are also local. Shared links contain your values. The currency tool requests the selected currencies from its rate provider without sending your amount.

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