How do you convert feet per second to kilometers per second?

To convert feet per second (ft/s) to kilometers per second (km/s), multiply the speed in feet per second by 0.0003048 (kilometers per second = feet per second × 0.0003048).

What is 5 feet per second in kilometers per second?

5 feet per second (5 ft/s) is equal to 0.001524 kilometers per second (0.001524 km/s).

Which is larger, 1 feet per second (ft/s) or 1 kilometers per second (km/s)?

One kilometers per second (km/s) is larger than one feet per second (ft/s). Specifically, 1 km/s equals 3,280.8399 ft/s, while 1 ft/s is 0.0003048 km/s.

How do I convert back from kilometers per second (km/s) to feet per second (ft/s)?

To reverse the calculation from km/s to ft/s, multiply your kilometers per second value by the inverse factor 3,280.8399 (or divide by 0.0003048). You can also click the Swap button in the tool above to flip directions in one click.

How many decimal places should I round ft/s to km/s results to?

For everyday comparisons and quick estimates, rounding to 2 decimal places is usually sufficient (for example, 5 ft/s ≈ 0.00 km/s). For engineering, laboratory, or machining specifications, select 4 or 6 decimals—or Scientific (10ⁿ) mode—in the calculator toolbar above.

Feet per Second to Kilometers per Second Converter

Enter the speed in feet per second below to convert it to kilometers per second.

Kilometers per Second to Feet per Second (km/s → ft/s)

Convert Feet per Second to Kilometers per Second

Enter a value in feet per second (ft/s) to convert to kilometers per second (km/s).

Value (ft/s)

From

Result

•

0.001524kilometers per second

5 ft/s = 0.001524 km/s

Result updates automatically

Get Widget

Equivalent Measurements Across UnitsFor 5 ft/s

Knots2.96242 kn

Suggested Conversions

Reference:NIST SP 811 (NIST SP 811 App. B.9 (Velocity))

[1–3] ↓

Feet per Second to Kilometers per Second Conversion Table

Table showing various feet per second measurements converted to kilometers per second. Click any preset value or arrow to load it into the converter.

Feet per Second (ft/s)	Kilometers per Second (km/s)
1 ft/s	0.0003048 km/s
2 ft/s	0.0006096 km/s
2.5 ft/s	0.000762 km/s
5 ft/s	0.001524 km/s
10 ft/s	0.003048 km/s
15 ft/s	0.004572 km/s
20 ft/s	0.006096 km/s
25 ft/s	0.00762 km/s
30 ft/s	0.009144 km/s
50 ft/s	0.01524 km/s

How to Convert Feet per Second to Kilometers per Second

To convert feet per second to kilometers per second, multiply the speed by the following conversion ratio: 0.0003048 kilometers per second/feet per second.

Since one feet per second is equal to 0.0003048 kilometers per second, you can use this simple formula to convert:

kilometers per second = feet per second × 0.0003048

The speed in kilometers per second is equal to the speed in feet per second multiplied by 0.0003048.

For example, here's how to convert 5 feet per second to kilometers per second using the formula above.

kilometers per second = (5 ft/s × 0.0003048) = 0.001524 km/s

How Many Kilometers per Second Are in a Feet per Second?

There are 0.0003048 kilometers per second in a feet per second, which is why we use this value in the formula above.

1 ft/s = 0.0003048 km/s|1 km/s = 3,280.839895 ft/s

Our feet per second to kilometers per second calculator automatically converts your speed measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.

Feet per Second and kilometers per second are both units used to measure speed. Keep reading to learn more about each unit.

What Is a Feet per Second?

A feet per second is a unit of speed equal to 0.3048 meters per second (m/s), the base unit for speed. Equal to 0.3048 m/s. [1]

The feet per second is classified as a US customary and imperial unit of speed. Feet per Second can be abbreviated as ft/s; for example, 1 feet per second can be written as 1 ft/s.

When working with feet per second (ft/s) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.

In practice, feet per second (ft/s) are widely used across standard speed applications within US customary and imperial workflows, engineering documentation, and technical data sheets.

Learn more about feet per second in our Speed Converter.

What Is a Kilometers per Second?

A kilometers per second is a unit of speed equal to 1,000 meters per second (m/s), the base unit for speed. Astrophysics & orbital velocity unit equal to 1,000 m/s. [2]

The kilometers per second is classified as an International System of Units (SI) unit of speed. Kilometers per Second can be abbreviated as km/s; for example, 1 kilometers per second can be written as 1 km/s.

In the metric system, "kilo" is the standard SI prefix for thousands, or 10³. This makes the kilometers per second (km/s) a convenient decimal multiple of the meters per second (m/s).

In practice, kilometers per second (km/s) are widely used across large-scale industrial, bulk, and macro-level speed specifications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.

Learn more about kilometers per second in our Speed Converter.

When converting speed between feet per second (ft/s) and kilometers per second (km/s), keep full floating-point precision (1 ft/s = 0.0003048 km/s; 1 km/s = 3,280.839895 ft/s) during intermediate calculations and round only the final kilometers per second figure to match your instrument tolerance.

More Feet per Second & Kilometers per Second Conversions

Need to calculate in the opposite direction? Use our kilometers per second to feet per second calculator to switch your starting unit immediately. You can also explore related tools such as converting kilometers per second to feet per second, converting feet per second to miles per hour, or converting miles per hour to kilometers per hour.

Convert from Feet per Second

Convert to Kilometers per Second

Frequently Asked Questions

There are 0.0003048 kilometers per second (km/s) in 1 feet per second (ft/s). Conversely, 1 kilometers per second (km/s) is equal to 3,280.8399 feet per second (ft/s).

Speed Converter

Quick Info

Direct Factor: 1 feet per second (ft/s) equals 0.0003048 kilometers per second (km/s).
Inverse Factor: 1 kilometers per second (km/s) equals 3,280.8399 feet per second (ft/s).
Formula: kilometers per second = feet per second × 0.0003048.
Verified Precision: Anchored to official NIST SP 811 and ISO/IEC 80000 standards.

Units Comparison

Feet per Second (ft/s)

Equal to 0.3048 m/s.

Kilometers per Second (km/s)

Astrophysics & orbital velocity unit equal to 1,000 m/s.

Meters per Second (m/s)

Coherent SI unit of velocity.

References

[1]NIST SP 811 · NIST SP 811 App. B.9 (Velocity)
Source
[2]NIST OWM · SI Units — Length & Distance
Source
[3]NIST CUU · SI Coherent Derived Units (m/s)
Source

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References

NIST · BIPM · ISO

[1]
NIST SP 811 (NIST SP 811 App. B.9 (Velocity))·Speed Metrology Standard — Feet per Second (ft/s) to Kilometers per Second (km/s)
NIST SP 811 Standard
[2]
NIST OWM (SI Units — Length & Distance)·Unit Specifications: Feet per Second (ft/s) & Kilometers per Second (km/s)
NIST OWM Specification
[3]
NIST CUU (SI Coherent Derived Units (m/s))·Conversion Factors & Mathematical Basis (ft/s to km/s)
NIST CUU Reference

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