Instant • Offline • Private

Online Percentage Calculator

Quickly solve everyday math problems like discounts, tips, margins, and taxes without sending your financial numbers to a server.

What is % of
= 15
is what % of
= 25%
by %
= 110

When to use a Percentage Calculator

Calculating percentages in your head can be tricky, especially when dealing with exact decimal figures like tax rates or profit margins. This offline utility is designed to handle the three most common percentage formulas instantly:

1. Finding a Fraction

"What is 15% of $80?"

Perfect for calculating tips at restaurants, figuring out sales tax, or identifying the exact dollar amount of a percentage-based discount.

2. Finding the Ratio

"25 is what percent of 100?"

Ideal for finding conversion rates, test scores, or determining what percentage of a budget has already been spent.

3. Markups & Markdowns

"Increase 100 by 10%"

Used daily by e-commerce managers to calculate retail markup pricing, or to find the final price of an item after applying a percentage-off coupon.