Calculate RC time constant, settling time, cutoff frequency, and charge/discharge progress.

Test JavaScript regex patterns and inspect matches and capture groups.

Decode 4-band and 5-band resistor color codes.

Convert between decimal numbers and standard Roman numerals.

Find running pace per km or mile from distance and time.

Find sales tax, final price, pre-tax price, or tax rate.

Scientific math functions with degree and radian modes.

Compare SemVer versions and inspect prerelease precedence.

Combine resistors in series or parallel and calculate total current and power.

Convert km/h, mph, m/s, ft/s, and knots instantly.

Mean, median, mode, variance, standard deviation, and more.

Convert Celsius, Fahrenheit, and Kelvin temperatures.

Compare two texts and find line-by-line changes.

Find hours, minutes, total minutes, and decimal hours between times.

Convert times between searchable IANA time zones.

Find tip, total, and per-person split for a bill.

Calculate transformer turns ratio, secondary turns, current, and reflected impedance.

Solve triangle sides, angles, area, and perimeter.

Find the price per unit for packages and multipacks.

Convert Unix seconds, milliseconds, ISO dates, UTC, and local time.

Convert URL text to and from percent encoding.

Inspect URL components and query parameters.

Convert UTC into local time with offsets and ISO output.

Count UTF-8 bytes, Unicode code points, and UTF-16 code units.