🚀 Speed Converter

Knots to Feet per Second
( kn → ft/s )

Instantly convert knots to feet per second. Enter any value below and get an accurate result with the full formula and reference table.

Converter Tool
kn
ft/s
Result
1 kn ≈ 1.687809857 ft/s
1.687809857
ft/s
The Formula
ft/s = kn × 1.687809857
1 knot = 1.852 km/h, 1 km/h = 0.911344415 ft/s → 1.852 × 0.911344415 = 1.687809857 ft/s. Therefore, ft/s = knots × 1.687809857.

How to Convert Knots to Feet per Second

To convert knots to feet per second, multiply the number of knots by 1.687809857. This is derived from the definitions: 1 knot = 1 nautical mile per hour, 1 nautical mile = 1852 m, and 1 m/s = 3.28084 ft/s.

Step-by-Step Example

Let’s convert 10 knots to feet per second:

1. Multiply by 1.687809857: 10 × 1.687809857 = 16.87809857
2. So 10 knots equals approximately 16.88 ft/s.

For a smaller amount, 5 knots × 1.687809857 = 8.439049285 ft/s.

When You’d Use Each Unit

Knots are the standard unit for speed in aviation, maritime navigation, and meteorology. Feet per second are often used in engineering, ballistics, and some everyday applications in the United States. Converting between them is essential for technical calculations and comparing speeds in different contexts.

Conversion Table

Common knots values converted to feet per second — typical values highlighted.

knots ft/s Approximate
Frequently Asked Questions
How do I convert knots to ft/s quickly? +
Multiply the number of knots by 1.68781. For example, 20 knots × 1.68781 = 33.7562 ft/s. This tool provides the precise value.
How many ft/s are in a knot? +
There are approximately 1.68781 feet per second in one knot.
What is 1 knot in ft/s? +
1 kn ≈ 1.68781 ft/s.
What is 1 ft/s in knots? +
1 ft/s ≈ 0.592484 knots.
What is 30 knots in ft/s? +
30 knots ≈ 50.6343 ft/s.
Can I convert ft/s back to knots with this tool? +
Yes! Just type a value into the ft/s field and the knots field updates automatically. Or use the ⇄ swap button to switch directions.
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