Speed Unit Converter

Enter a value in any unit input field, and the system will automatically convert and display corresponding values for all other units. Click the advanced module switches to expand more unit options.

Enter Speed

Enter a value in any unit input field, and other units will automatically sync and update.

Common Units

Meter per second

m/s

Kilometer per hour

km/h

Mile per hour

mph

Knot

Foot per second

ft/s

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Usage Instructions

About Speed Unit Converter

Speed Unit Converter is a fast and precise tool for converting between various speed units. It supports common units used in daily life and transportation, as well as specialized units for scientific research, engineering, aerospace, physics, astronomy, and oceanography.

Key Features

Common Units: m/s, km/h, mph, knots, ft/s
Aerospace: Mach, km/s, ft/min
Physics: Speed of light, cm/s, MeV/c
Engineering: mm/s, in/s, yd/s
Astronomy: AU/yr, ly/yr, pc/yr
Oceanography: nmi/d
Rare Units: Furlong/hour, chain/hour, Chinese li/hour, rod/hour
Real-time Conversion: Instant conversion as you type
High Precision: Accurate conversion factors with appropriate decimal precision
Privacy Protection: All conversions performed locally in your browser

Conversion Standards

Base Unit

All conversions use m/s (meter per second) as the base unit. Every unit has a precise conversion factor to m/s, ensuring accuracy and consistency.

Precision Rules

Common Units: Display up to 6 decimal places, automatically removing trailing zeros
Professional Units: Display up to 9 decimal places for high precision
Astronomical Units: Use scientific notation for very large values
Automatic Formatting: Very large or very small values automatically switch to scientific notation

Use Cases

Daily Life: Convert between metric and imperial units for driving, running, etc.
Transportation: Convert vehicle speeds, flight speeds, maritime speeds
Physics Research: Work with relativistic speeds, particle physics
Engineering: Convert between various mechanical and industrial units
Astronomy: Work with astronomical velocities and cosmic scales
Oceanography: Convert maritime and oceanographic speed measurements

FAQ

Q: How do I reset all inputs?: A: Click the "Reset" button (rotating arrow icon) in the top-right corner of the input area to clear all input data and restore to the initial state.
Q: Which units are supported?: A: Supports common units (m/s, km/h, mph, knots, ft/s), professional units (Mach, km/s, speed of light, cm/s, mm/s, in/s, yd/s, AU/yr, ly/yr, pc/yr, nmi/d), and rare units (furlong/hour, chain/hour, Chinese li/hour, rod/hour).
Q: What is the conversion precision?: A: All conversions use m/s as the base unit with precise conversion factors. Common units retain up to 6 decimal places, professional units retain up to 9 decimal places, and astronomical units use scientific notation.
Q: Is data automatically saved? Will it be lost when refreshing the page?: A: Yes, input data is automatically saved to browser local storage. Refreshing the page won't cause data loss, and you can continue editing previously entered content. Data is automatically saved about 400ms after you stop typing.