How to Calculate Percentage Increase / Decrease
Calculate the percentage increase or decrease between two values. Process: provide an original value and a new value, compute the difference, divide by the original value, and multiply by 100 to get the percentage. Useful for finance, discounts, analytics and reporting.
What: Compute percentage change between two numbers and interpret whether it is an increase or a decrease. Usage: enter the original and new values then click calculate. Process: Δ = new − original; percent = (Δ / original) × 100. Scenarios: pricing changes, revenue growth, discounts and KPI reporting.
Frequently asked questions
What is the percentage change formula?
Percent change = (New − Original) / Original × 100. Positive means increase; negative means decrease.
Why must the original value be non-zero?
Division by zero is undefined. If the original value is 0, percentage change from that base cannot be computed.
Is percentage change the same as percentage points?
No. Moving from 10% to 12% is a 2 percentage-point rise, but a 20% relative increase.