Choose a category below and convert between units quickly and accurately.
Result
1 Knots = 1.7160e-9 Speed of Light
Velocity conversions from everyday speeds to supersonic Mach numbers and the speed of light.
| Knots (kn) | Speed of Light (c) |
|---|---|
| 1 kn | 1.7160e-9 c |
| 2 kn | 3.4320e-9 c |
| 5 kn | 8.5800e-9 c |
| 10 kn | 1.7160e-8 c |
| 25 kn | 4.2900e-8 c |
| 50 kn | 8.5800e-8 c |
| 100 kn | 1.7160e-7 c |
| 250 kn | 4.2900e-7 c |
| 500 kn | 8.5800e-7 c |
| 1000 kn | 1.7160e-6 c |
Formula
Speed of Light = Knots × 1.7160e-9
Worked Example
Example: 5 Knots = 5 × 1.7160e-9 = 8.5800e-9 Speed of Light
To convert Knots to Speed of Light, multiply the Knots value by 1.7160e-9. This factor is derived from the ratio between the two units.
A knot is a unit of speed equal to one nautical mile per hour (approximately 1.151 mph or 1.852 km/h). It is the standard unit of speed in maritime and air navigation worldwide.
History
The term 'knot' comes from the practice of measuring a ship's speed by throwing a log overboard attached to a rope with knots tied at regular intervals. Sailors would count how many knots passed through their hands in a set time. One knot equals one nautical mile per hour.
Celsius is a temperature scale where 0°C is the freezing point of water and 100°C is the boiling point of water at standard atmospheric pressure. It is used by most countries worldwide for everyday temperature measurement and in scientific contexts.
History
The Celsius scale was proposed by Swedish astronomer Anders Celsius in 1742. Originally, his scale was inverted (0° was boiling, 100° was freezing), but it was reversed after his death. The scale was renamed from 'centigrade' to 'Celsius' in 1948 by the General Conference on Weights and Measures.
Calculated using the latest NIST standards for physical constants and unit ratios.
No reload required. Get your results in real-time as you type or change units.
A responsive precision tool that fits in your pocket or dominates your desktop.
Each category converts first through a base unit, then into the destination unit. That keeps the math consistent across metric and imperial systems and makes it easier to explain how results are generated.
Use these tools for planning, study, and everyday reference. For regulated, medical, engineering, or procurement work, confirm requirements against the official standard or specification you are working from.