Utilities & Conversions

Everyday Math Made Effortless

Not every calculation involves a mortgage or retirement plan. Some of the most useful math happens in ordinary situations: figuring out the sale price after a discount, splitting a restaurant check, comparing the price per ounce on two different product sizes, or estimating how much your phone charger costs to run each month. These utility calculators cover the everyday numbers that come up constantly but rarely get solved accurately with mental math alone.

Percentages and Pricing

Percentages appear constantly in daily life — discounts, tax rates, tips, grade curves, and interest rates all expressed as a percent. The Percentage Calculator handles the three most common percentage problems: finding what percentage one value is of another, calculating a percentage increase or decrease between two values, and finding the actual value that a percentage represents. The Discount Calculator takes a listed price and discount percentage and shows the exact sale price and dollar amount saved. The Sales Tax Calculator adds the applicable tax rate to any subtotal so you know the true cost at checkout.

Costs and Comparisons

The Unit Price Calculator compares two products by reducing each to a cost per unit of measure — per ounce, per sheet, per serving — making it easy to identify the better value regardless of how the products are packaged. The Profit Margin and Markup Calculators help freelancers, small business owners, and anyone pricing products understand the difference between margin (profit as a percent of revenue) and markup (profit as a percent of cost), which are often confused but produce very different selling prices. The Commission Calculator converts a total sales figure and commission rate into a take-home dollar amount instantly.

Time, Age, and Unit Conversions

The Age Calculator computes your exact age in years, months, and days from any birth date, useful for legal documents, medical forms, and curious moments. The Time Duration Calculator finds the hours, minutes, and seconds between any two points in time, handy for shift work, event planning, and tracking elapsed time. The Unit Conversion Calculator covers the most common measurement categories — length, weight, volume, temperature, and speed — in both metric and imperial units so you always have the right number in the right unit.

Frequently Asked Questions