Unit converters
Convert between metric and imperial units, turn steps into miles, work out the volume of a tank or the square footage of a room, and write numbers out in words.
Conversion factors come from NIST definitions, so an inch is exactly 2.54 cm and a mile exactly 1,609.344 m.
ConvertersUnit ConverterConvert length, mass, temperature, area, volume, speed, time, and decimal or binary data units with transparent factors and precision.ConvertersNumbers to Words ConverterConvert whole numbers, decimals, currency amounts, checks, ordinals, and scientific notation into English words.ConvertersVolume CalculatorCalculate and compare geometric volume, capacity, surface area, occupied volume, and unit conversions for ten common solids.ConvertersSteps to Miles CalculatorConvert a step count into miles and kilometers with a measured step length, known-distance calibration, or clearly labeled height estimate.ConvertersSquare Footage CalculatorCalculate net project area for six common shapes, then compare unit conversions, deductions, material allowance, package coverage, and cost.ConvertersFuel Cost CalculatorEstimate fuel, cost, unit equivalents, repeat trips, route allowance, shared cost, and real-world fuel-use scenarios.ConvertersSpeed CalculatorSolve average speed, distance, or travel time with independent units, pace conversions, reverse checks, and constant-rate benchmark projections.ConvertersMass CalculatorConvert mass across metric, avoirdupois, troy, jewelry, and industrial units with exact factors, precision control, reverse checks, and a complete equivalence table.ConvertersShoe Size Conversion CalculatorMatch an adult shoe label or measured foot length to listed US, UK, EU, and Mondopoint references from two published manufacturer charts.