Speed Converter

Free Online Speed Converter

This tool supports conversion between common speed units including m/s, km/h, mph, ft/s, knots, Mach, and speed of light. Enter a value in any unit to see results in all other units in real time. All data is processed locally in your browser — nothing is uploaded to any server, fully protecting your privacy.

Features

• Supports 7 common speed unit conversions
• Covers metric, imperial, and aviation/nautical units
• All units displayed simultaneously with real-time sync
• Automatic scientific notation for very large or small values
• One-click copy of conversion results
• Pure frontend offline processing, protects user privacy

Common Conversion Formulas

• 1 km/h = 0.2778 m/s
• 1 mph = 1.609 km/h
• 1 kn = 1.852 km/h
• 1 Ma = 343 m/s
• Speed of light c = 299792458 m/s

Common Reference Values

• 1 km/h ≈ 0.278 m/s
• 1 mph ≈ 1.609 km/h
• 1 knot ≈ 1.852 km/h
• 1 Mach ≈ 1235 km/h

How to Use

1. 1Click on any unit card's input field
2. 2Enter a value, other units update in real time
3. 3Click the copy button to copy conversion results