Enter an old value and a new value to see the percent increase or decrease between them.
Percentage change is always relative to the OLD value. A rise then an equal-percent fall doesn't return to the start. General information only.
Percentage change measures a rise or fall relative to where you started. Divide the difference by the original value — not the new one — and multiply by 100.
Change % = (new − old) ÷ old × 100
Because change is measured from the starting point. Dividing by the new value answers a different question and gives a smaller number.
No. 100 → 150 → 75. The percentages apply to different bases, so you end up lower than you started.
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Yes. The Percentage Change Calculator is completely free, runs in your browser, and never asks for a signup, email, or download. Enter your numbers and the result updates instantly.
It uses standard formulas and recalculates the moment you change a value, so the math is exact for the inputs you enter. Treat the result as a reliable planning estimate; for decisions with legal or tax consequences, confirm the figures with a qualified professional.
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Last reviewed: September 2026. Free to use, no signup — Percentage Change Calculator by ToolWise Digital.
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