Percentage Calculator

Use the first section to calculate a percentage of any value, such as sales tax, markdowns, or commission.

Use the second section to express one number as a percentage of another, helpful for exam scores, budget utilization, or growth comparisons.

Results update instantly in the browser, making it easy to test multiple scenarios while shopping or planning.

Percentage math appears everywhere in personal finance: coupon discounts, annual fee increases, portfolio allocation targets, and tip calculations all rely on the same proportional relationships this page solves in two directions.

When finding a percent of a number, convert the percentage to a decimal mentally by dividing by one hundred, then multiply. The first calculator section performs that conversion automatically so you can focus on the scenario rather than arithmetic.

When asking what percent one value is of another, order matters. The part goes in the numerator and the whole in the denominator. That distinction helps avoid common mistakes such as comparing a discount to the sale price instead of the original price.

For budgeting, try entering your monthly take-home pay as the whole and each expense category as the part. Seeing recurring bills as a share of income makes it easier to spot categories that deserve a closer look.