Measurement Converters
Convert mass, temperature, speed, and pressure values with visible formulas and full unit tables. Each converter uses the correct SI base route: kilograms, kelvin, meters per second, or pascals.
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Weight and Mass Converter
Convert kilograms, grams, pounds, ounces, stones, tons, grains, and slugs through kilogram factors.
Temperature Converter
Convert Celsius, Fahrenheit, kelvin, and Rankine with offset-aware formulas.
Speed Converter
Convert m/s, km/h, mph, ft/s, knots, cm/s, in/s, and Mach at standard atmosphere.
Pressure Converter
Convert Pa, kPa, MPa, bar, mbar, atm, psi, psf, Torr, mmHg, and inHg.
Physical unit converters available now
Weight and Mass Converter
Convert kilograms, grams, pounds, ounces, stones, tons, grains, and slugs through kilogram factors.
Use converterTemperature Converter
Convert Celsius, Fahrenheit, kelvin, and Rankine with offset-aware formulas.
Use converterSpeed Converter
Convert m/s, km/h, mph, ft/s, knots, cm/s, in/s, and Mach at standard atmosphere.
Use converterPressure Converter
Convert Pa, kPa, MPa, bar, mbar, atm, psi, psf, Torr, mmHg, and inHg.
Use converterWhy each physical converter has its own base unit
Physical unit conversion is not one generic operation. Mass uses kilograms, temperature uses kelvin and offset formulas, speed uses meters per second, and pressure uses pascals. Treating all four categories as simple multiplication would produce wrong temperature answers and unclear pressure or speed context.
Toolarithm keeps the formula visible on each converter page and shows the full table of supported units. That makes a quick answer useful for copying, but also gives enough context to verify the unit factor before the result goes into a worksheet, specification, lab note, or project document.
Common unit conversions reference
Common Unit Conversions Guide
Review the most common physical-unit relationships, including pounds to kilograms, Celsius to Fahrenheit, mph to km/h, and atm to kPa.