This calculator works out compound percentage change over multiple periods. It’s useful for repeated price rises, monthly growth rates, investment returns, inflation adjustments, and any situation where the percentage change applies again and again.
Compounding is different from adding the percentages. For example, increasing £100 by 10% for two periods is not £100 + 20% = £120. It’s £100 × 1.10 × 1.10 = £121.00. This page calculates the final value and also shows the total overall percentage change from the original value. If you only need a single-step change from old to new, use the Percentage Change calculator.
Formula: final = start × (1 + p/100)n.
Steps: 100×1.10² = 121
Result: £121.00 (21.00% total increase)
Steps: 200×1.03¹²
Result: £253.85 (26.93% total increase)
It means the percentage change applies repeatedly to the updated value each period.
Because each period’s change uses a new base value, so the effect stacks.
Yes. A negative rate models repeated decreases (e.g., depreciation).
The final value equals the starting value because no changes are applied.