Updated · Built and checked by the PlinzoTools team, formulas tested against published sources
Calculate the percentage increase between an original value and a new value.
This tool calculates the percentage increase from an original value to a new (higher) value using ((new − original) ÷ original) × 100.
Enter the original value and the new value. The percentage increase appears instantly.
Imagine a hypothetical online shop whose monthly orders went from 400 to 520. Enter 400 as the original value and 520 as the new value. The difference is 120, and 120 divided by 400 is 0.30, so the tool reports 30.00% and labels it an increase. The label under the number switches to Decrease if the result is negative, so you can tell direction at a glance.
increase % = ((new - original) / |original|) x 100
A frequent source of confusion is mixing up relative change with percentage points. If a conversion rate rises from 2% to 3%, the change is one percentage point, but the relative increase is 50%, because 1 divided by 2 is 0.5. This tool computes the relative change. Enter 2 and 3 and you will get 50.00%. When you report results, say which one you mean so readers do not misread it.
The base for the calculation is always the original value. A rise of 50% from 100 gives 150, but a fall from 150 back to 100 is only a 33.33% decrease, not 50%. This matters when you chain changes: gaining 20% and then losing 20% does not bring you back to the start. From 100 you reach 120, then 96. Use the two-step approach in the tool, running each change separately, if you want to see the effect.
This tool finds the percentage from two known values. If you already know the percentage and the original and need the new figure, multiply the original by one plus the percentage as a decimal. An original of 80 with a 15% increase becomes 80 x 1.15 = 92. You can then paste 80 and 92 into the tool to confirm that it returns 15.00%.
This tool is useful for comparing prices before and after a change, tracking growth in traffic, salary changes, population or measurements over time, and checking figures quoted in news reports. It does not account for inflation, compounding across multiple periods, or annualising a change; for those you need a growth-rate or compound-interest calculation.
The result will show as a negative percentage -- effectively a percentage decrease. Use the dedicated Percentage Decrease Calculator if you want the magnitude framed as a decrease.
A percentage increase divides the change by the original value, and dividing by zero is undefined. There is no sensible percentage for growth from nothing, so the tool shows a dash instead.
Percentage points describe the arithmetic gap between two percentages, while this tool gives the relative change. From 4% to 5% is one percentage point but a 25.00% relative increase.
Yes. The original value is the base. Swapping the numbers changes the base and the sign, so 100 to 125 is 25.00% but 125 to 100 is -20.00%.
Yes, the tool divides by the absolute value of the original so the direction stays correct, but percent change on negative baselines can be hard to interpret. Describe it in plain units if the audience may be confused.
Reference: NIST Weights and Measures