Solve average acceleration, velocity, or time.

Calculate a date before or after a chosen number of days, weeks, months, or years.

Find completed years, months, days, total days, and next birthday.

Convert square meters, square feet, acres, hectares, and more.

Simplify dimensions and resize them without changing their proportions.

Calculate and compare four useful types of averages.

Convert plain text and Base64 in either direction.

A simple arithmetic calculator for quick results.

Calculate adult BMI and the standard screening category from height and weight.

Calculate weekdays between dates and optionally exclude holidays.

Build and understand HTTP Cache-Control directives.

Combine capacitors in series or parallel and calculate equivalent capacitance.

Convert text into common writing and developer casing styles.

Convert Unix file permissions between octal and rwx notation.

Check WCAG text contrast ratios for two web colors.

Convert and preview HEX, RGB, and HSL colors.

Estimate final balance, contributions, and interest earned with compounding.

Understand each field in a five-field cron schedule.

Build layered CSS box shadows with a live preview.

Build fluid CSS clamp() values from size and viewport endpoints.

Create copyable linear and radial CSS gradients with a live preview.

Convert relative CSS units with the context that determines their real size.

Convert structured CSV and JSON data in either direction.

Split total current across parallel resistors and calculate branch currents, voltage, resistance, and power.