SCHOOL PLANNING AND CORE MATH
Percentage Decrease Calculator
Calculate the percentage decrease from an original value to a smaller new value.
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Enter your values and select Calculate. Your result stays on this device.
How it works
Percentage decrease = (original value − new value) ÷ original value × 100.
Assumptions
The original value must be greater than zero.
Use case
percentage decrease calculator: a clear planning check
Calculate the percentage decrease from an original value to a smaller new value. The stated formula, assumptions, and result limits remain visible so the calculation can be checked in context.
Use a clear percentage decrease calculator scenario with values you can verify before relying on the result.
Method and update
Last reviewed: 2026-08-08. This tool performs the stated formula locally in your browser using the values you enter.
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