Solve every common percentage problem in one place: what is X% of Y, X is what percent of Y, and percent increase or decrease between two numbers.
No more pulling up a calculator and remembering whether to multiply or divide. The labels show exactly what each input means.
Retail discounts, tax calculations, tip splitting, grade percentages and growth rates all boil down to the same math with different framing. What is 15% off 79.99? What percent is 42 of 160? Did revenue grow or shrink quarter over quarter?
Mental math on percentages introduces rounding errors that compound in spreadsheets. A dedicated calculator gives exact figures you can paste into invoices, reports and presentations with confidence.
(new − old) ÷ old × 100. A positive result is an increase, negative is a decrease. We display both the percent and the absolute difference.
Yes. Percent change can exceed 100% if the new value is more than double the old. Percent of a number can also exceed 100% (e.g. 150% of 80 = 120).
Mathematically they're the same operation. 'Percent off' is the retail framing of percent decrease, where the old value is the original price.
Percent change relative to zero is mathematically undefined. Use absolute difference instead when the starting value is zero.