UC Unit ConversionScientific reference desk

Established for clear calculation
Practical units, careful definitions, precise answers.

The measure of things

Every quantity deserves a clear answer.

A dependable desk for converting everyday, technical, and scientific units—with the working shown plainly enough to understand.

1 m = 100 cm  ·  Exact relationships. Useful explanations.

Conversion tables

Find your field of measurement

Start with a familiar category, then move from question to calculation without losing the meaning of the unit.

01 / GEOMETRY

Angle

Convert degrees, radians, gradians, arcminutes, and arcseconds for geometry, navigation, engineering drawings, astronomy, and technical calculations.

→ 02 / SPACE

Area

Compare square metres, square feet, acres, hectares, and square kilometres when planning rooms, gardens, property, maps, and land surveys.

→ 03 / FINANCE

Currency

Translate monetary amounts between major currencies for travel budgets, international shopping, invoices, and comparing costs across countries.

→ 04 / DIGITAL

File size

Understand bits, bytes, decimal storage units, and binary units such as KiB and MiB. Compare downloads, device capacity, cloud storage, and network speeds.

→ 05 / ELECTRICITY

Electrical

Convert voltage, current, resistance, power, charge, and related electrical units for circuits, appliances, electronics projects, and engineering work.

→ 06 / PHYSICS

Energy

Move between joules, calories, kilowatt-hours, electronvolts, and BTUs to compare food energy, heating, batteries, fuel, and scientific results.

→ 07 / SI BASE

Length

Convert metres, kilometres, centimetres, miles, yards, feet, inches, and nautical miles for travel, construction plans, sports, and measurements.

→ 08 / FORCE

Pressure

Compare pascals, bar, psi, atmospheres, millimetres of mercury, and more for tyres, weather, diving, laboratory work, and industrial systems.

→ 09 / MOTION

Speed

Translate mph, km/h, metres per second, knots, and Mach for journeys, cycling, aviation, weather data, racing, and science experiments.

→ 10 / THERMAL

Temperature

Move confidently between Celsius, Fahrenheit, Kelvin, and Rankine for weather reports, ovens, engineering data, classroom science, and research notes.

→ 11 / DURATION

Time

Convert seconds, minutes, hours, days, weeks, months, and years for project planning, routines, timetables, historical dates, and scientific observations.

→ 12 / CAPACITY

Volume

Calculate litres, millilitres, gallons, cubic metres, cups, pints, and fluid ounces for cooking, fuel, aquariums, laboratory work, and home projects.

→ 13 / MATERIAL

Weight

Compare grams, kilograms, ounces, pounds, stones, tonnes, and more for recipes, luggage limits, health tracking, shipping, and laboratory measurements.

→

Field notes

Understand before you convert.

Good conversion is more than moving a decimal point. We explain where units come from, which relationships are exact, and when context changes the answer.

Read the measurement guide →
Exact
Metric prefixes scale by powers of ten: 1 kilometre is exactly 1,000 metres.
Context
Mass and weight are related but not identical: mass measures matter; weight depends on gravity.
Care
Temperature conversions use an offset as well as a scale, so they cannot be converted by simple multiplication.