Math Calculators

Simple math helpers for percentages, discounts, taxes, tips, and everyday comparisons.

Percentage Calculator

Find a percentage of a number and compare increase or decrease.

Calculate tip amount, total bill, and split cost per person.

Calculate sale price, discount amount, and optional tax.

Calculate tax amount and total price after tax.

Scale a value by the golden ratio and its reciprocal.

Calculate ratio, scaled values, and proportional parts.