Velocity: units and measurement guide

What is being measured?

Speed is the magnitude of motion per time. These conversions change its unit and do not infer a velocity direction.

Convert compatible measurements of the same quantity. A unit conversion does not infer a new physical property.

Choose a unit definition

Symbols, prefixes and conventions matter. Each row links to a definition, a worked example and a comparison table. Units of different quantities are kept separate even when symbols or dimensions look similar.

Choose the conversion direction

Start with the unit attached to the original measurement. Select the unit needed by the receiving report, specification or formula. Conversion tools preserve the measured quantity; calculating another property can require additional measured inputs and assumptions.

Precision and common mistakes

• Keep the source and target quantity consistent. A matching symbol is not enough to establish a compatible definition.
• Record the original measurement precision. Showing twelve significant digits in a table does not make a rounded input more precise.
• Check symbol capitalization, prefixes and any regional convention in the source. Use the displayed unit definition rather than a similarly named unit.
• Factors involving repeating fractions or π use finite numerical precision. Round the final answer to the precision justified by your input.

Use a working converter

• Speed converter
• Metres per second to Kilometres per hour converter
• Metres per second to Miles per hour converter
• Metres per second to knots converter
• Metres per second to feet per second converter
• Metres per second to kilometers per second converter

Source and verification scope

Examples and tables are computed from the versioned unit definitions used by the linked converters. The source access dates appear below. Computandum is independent of the cited organizations; a citation does not mean that a publisher endorses this page or an actual project.

Read the calculation and sourcing methodology →