Calculate distance, average speed, or travel time using knots, mph, or km/h and nautical miles, miles, or kilometers. Assumes a constant average speed and excludes stops.
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Distance From Knots Formula
The following formula is used to calculate the Distance From Knots.
- Where Dk is the Distance From Knots (miles)
- SK is the total speed (knots)
- TT is the travel time (hrs)
To calculate statute miles, multiply the average speed in knots by 1852 / 1609.344 (approximately 1.150779448), then by the time in hours. For nautical miles, multiply knots by hours directly. Use speed over ground for distance over ground.
| Speed (knots) | 15 min (NM) | 30 min (NM) | 1 hour (NM) | 2 hours (NM) |
|---|---|---|---|---|
| 1 | 0.250 | 0.500 | 1.000 | 2.000 |
| 2 | 0.500 | 1.000 | 2.000 | 4.000 |
| 3 | 0.750 | 1.500 | 3.000 | 6.000 |
| 4 | 1.000 | 2.000 | 4.000 | 8.000 |
| 5 | 1.250 | 2.500 | 5.000 | 10.000 |
| 6 | 1.500 | 3.000 | 6.000 | 12.000 |
| 7 | 1.750 | 3.500 | 7.000 | 14.000 |
| 7.5 | 1.875 | 3.750 | 7.500 | 15.000 |
| 8 | 2.000 | 4.000 | 8.000 | 16.000 |
| 9 | 2.250 | 4.500 | 9.000 | 18.000 |
| 10 | 2.500 | 5.000 | 10.000 | 20.000 |
| 12 | 3.000 | 6.000 | 12.000 | 24.000 |
| 13 | 3.250 | 6.500 | 13.000 | 26.000 |
| 15 | 3.750 | 7.500 | 15.000 | 30.000 |
| 18 | 4.500 | 9.000 | 18.000 | 36.000 |
| 20 | 5.000 | 10.000 | 20.000 | 40.000 |
| 22 | 5.500 | 11.000 | 22.000 | 44.000 |
| 25 | 6.250 | 12.500 | 25.000 | 50.000 |
| 30 | 7.500 | 15.000 | 30.000 | 60.000 |
| 35 | 8.750 | 17.500 | 35.000 | 70.000 |
| * Rounded to 3 decimals. Assumes 1 knot = 1 nautical mile per hour. | ||||
How to Calculate Distance From Knots?
The following example problems outline how to calculate Distance From Knots.
Example Problem #1:
- First, determine the total speed (knots).
- The total speed (knots) is given as 15.
- Next, determine the travel time (hrs).
- The travel time (hrs) is provided as 20.
- Finally, calculate the Distance From Knots using the equation above:
Dk = SK * (1852 / 1609.344) * TT
The values given above are inserted into the equation below and the solution is calculated:
Dk = 15 * (1852 / 1609.344) * 20 ≈ 345.234 statute miles (300 nautical miles)
Example Problem #2:
For this problem, the variables needed are provided below:
total speed (knots) = 30
travel time (hrs) = 40
This example problem is a test of your knowledge on the subject. Use the calculator above to check your answer.
Dk = SK * (1852 / 1609.344) * TT = ?
