Marine & NauticalFeet per Second to Kilometers per Hour

Feet per Second to Kilometers per Hour

Snapshot

1 Foot per Second equals 1.09728 Kilometers per Hour. Conversion Encyclopedia uses the same fixed conversion basis across the calculator, common values, and reverse page for this page.

Reference basis: This result uses fixed vessel-speed definitions anchored to knots and the active marine route.
Example: For 5 Feet per Second, the result equals 5.4864 Kilometers per Hour.
Use the reverse page if you need the opposite direction with the same basis.

Use the interactive calculator below for custom values and the common-value table for quick checks.

Interactive conversion

Converter Calculator

1.09728 Kilometers per Hour (km/h)

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Machine access

Available to apps and AI agents

Feet per Second to Kilometers per Hour can be requested through Conversion Encyclopedia's structured interfaces by software and compatible AI agents. The identifiers below select the same calculation as the calculator.

Machine-readable identifiers

Conversion family: marine
Source unit: feet_per_second
Target unit: kilometers_per_hour

The JSON API and OpenAPI specification use the identifiers to reach the conversion engine. WebMCP lets compatible AI agents request the same calculation.

Example API request and response

POST /api/v1/convert

Request

{
  "family": "marine",
  "value": 1,
  "from": "feet_per_second",
  "to": "kilometers_per_hour"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "marine",
    "value": 1,
    "from": "feet_per_second",
    "to": "kilometers_per_hour",
    "result": {
      "raw": 1.09728,
      "display": "1.09728"
    },
    "canonicalPath": "/marine/feet-per-second-to-kilometers-per-hour/"
  }
}

Full API documentation

Explanation

Formula: Kilometers per Hour = Foot per Second × 1.09728. Why: marine speed units are normalized through knots, so the route follows one deterministic vessel-speed basis before applying the target unit.

Feet per Second (ft/s): an imperial speed unit used in engineering and flow-style velocity references.

Kilometers per Hour (km/h): a metric speed unit often used for vehicle and land-transport comparisons.

This route is useful when restating vessel speed between knots and engineering or land-speed units for navigation, instrumentation, and performance reporting.

This conversion is purely multiplicative because both units reduce through one fixed marine reference basis for the active family, with no offset.

Method & Marine Basis

Method basis: fixed vessel-speed definitions anchored to knots for marine reporting and instrumentation.
Applied factor: 1 Foot per Second = 1.09728 Kilometers per Hour.
Consistency rule: calculator output and common-value rows use the same fixed marine constants in both directions.

Common Conversion Values

Foot per Second (ft/s)	Kilometers per Hour (km/h)
1	1.09728
5	5.4864
10	10.9728
15	16.4592
20	21.9456
30	32.9184
40	43.8912

Questions & answers

Frequently Asked Questions

How many kilometers per hour are in 1 foot per second?

The fixed factor gives 1 foot per second = 1.09728 kilometers per hour.

What is the reverse conversion for Feet per Second to Kilometers per Hour?

Use the Kilometers per Hour to Feet per Second page to reverse the same vessel-speed relationship for knots, current, and performance checks.

Can I use decimal feet per second values?

Yes. Decimal feet per second values are supported for vessel speed, current, and instrumentation checks.