A knot is one nautical mile per hour.
Knots to Centimeter per Days Converter — kn to cm/d
Convert Knots (kn) to Centimeter per Days (cm/d) using the exact conversion factor (1 knots = 4,444,800 centimeter per days). See the formula, worked examples, conversion table, history, and common uses.
Knots to Centimeter per Days converter
Converter
Speed Converter
Convert road, aviation, marine, lab, and scientific speed units.
Context values
Some unit families need one extra value for a physically accurate result.
Distance divided by time.
Result = input x 0.5144444444 / 1.15740741e-7.
Speed uses meters per second as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Knots to Centimeter per Days
Knots and Centimeter per Days both describe speed, and the conversion matters whenever a maritime or aviation speed (knots) needs to be compared against a road speed (mph). Knots is most often used for ship and boat speed in marine navigation.
Formula
centimeter per days = knots × 4444800
This factor comes from each unit's defined relationship to the category's base unit: 1 knots equals 0.514444444444 base units, and 1 centimeter per days equals 1.157407e-7 base units, so dividing one by the other gives the direct knots-to-centimeter per days factor of 4444800.
Simple example
1 kn × 4444800 = 4,444,800 cm/d
1 knots = 4,444,800 centimeter per days.
Real-world example
10 kn × 4444800 = 44,448,000 cm/d
10 knots = 44,448,000 centimeter per days.
Conversion table
| Knots (kn) | Centimeter per Days (cm/d) |
|---|---|
| 1 kn | 4,444,800 cm/d |
| 5 kn | 22,224,000 cm/d |
| 10 kn | 44,448,000 cm/d |
| 25 kn | 111,120,000 cm/d |
| 50 kn | 222,240,000 cm/d |
| 100 kn | 444,480,000 cm/d |
Reverse conversion: Centimeter per Days to Knots
1 cm/d × 2.24982e-7 = 2.24982e-7 kn
1 centimeter per days = 2.24982e-7 knots.
knots = centimeter per days × 2.24982e-7
For a page dedicated to this direction, see Centimeter per Days to Knots.
Understanding the Knots
Knots (kn) measures speed. A knot is one nautical mile per hour; since the nautical mile is exactly 1,852 meters, a knot is exactly 1,852/3,600 m/s. It is classified as a Non-SI unit accepted for use with SI (maritime/aviation).
Where it's used: Used internationally in maritime navigation and aviation
Uses of the Knots today
- Ship and boat speed in marine navigation
- Aircraft airspeed and wind speed reporting in aviation
- Marine weather forecasts (wind speed)
History of the Knots
The knot gets its name from an old nautical method of measuring speed: sailors trailed a 'log line' with evenly spaced knots behind a ship and counted how many knots paid out over a fixed time, giving a direct speed reading in 'knots.'
The nautical mile it's based on was itself standardized internationally in 1929 (the International Nautical Mile, 1,852 m exactly), tying the knot to a precise value still used in shipping and aviation today.
Historical origin. Knots was not the invention of a single named person; it developed through the process described above.
Understanding the Centimeter per Days (cm/d)
Distance divided by time.
Knots — sources
- BIPM SI Brochure — Non-SI units accepted for use with SI — Lists the knot among accepted non-SI speed units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many centimeter per days are in 1 knots?
1 knots equals 4,444,800 centimeter per days, using the exact defined conversion factor rather than an estimate.
How do I convert knots to centimeter per days?
Multiply the knots value by 4444800. The converter above does this instantly to whatever precision you set.
How do I convert centimeter per days back to knots?
Use the reverse factor: 1 centimeter per days equals 2.24982e-7 knots. You can also use the swap control in the converter above to flip the direction instantly.
What is a knots?
Knots (kn) measures speed. A knot is one nautical mile per hour; since the nautical mile is exactly 1,852 meters, a knot is exactly 1,852/3,600 m/s. It is classified as a Non-SI unit accepted for use with SI (maritime/aviation).
What is a centimeter per days?
Centimeter per Days (cm/d) is a unit of speed.
Is the knots to centimeter per days conversion exact?
Yes. A knot is one nautical mile per hour; since the nautical mile is exactly 1,852 meters, a knot is exactly 1,852/3,600 m/s. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
Where is the knots still used today?
Used internationally in maritime navigation and aviation