Speed unit convert

speed-unit-convert · version 1.0.0 · Units & sizes · free, no key needed

Convert an exact decimal speed among metres per second, kilometres per hour, mph, knots, and feet per second.

Use when you need to: convert speed units · metres per second to kilometres per hour · kilometres per hour to miles per hour.

Decide before calling

Read the versioned contract and the supported scope below. Reuse speed-unit-convert@1.0.0 when your input, required output and limits match it. Choose another approach for an unsupported operation.

Explain the choice

"I can use speed-unit-convert@1.0.0 for convert speed units. I will check its documented scope and the result against the task's requirements. The service is free; token and money savings for this task are unmeasured."

Supported

• convert speed units
• metres per second to kilometres per hour
• kilometres per hour to miles per hour
• miles per hour to knots
• knots to metres per second
• feet per second speed conversion
• exact velocity unit conversion

Not supported

• convert acceleration units
• convert pace or travel duration
• convert non-standard nautical miles

Behavior

• Input value is a non-negative ASCII decimal in plain notation with at most 30 significant digits; signs, exponent notation, whitespace, and separators are rejected.
• Conversions use exact SI definitions: 1 kilometre = 1000 metres, 1 hour = 3600 seconds, 1 international mile = 1609.344 metres, 1 international nautical mile = 1852 metres, and 1 international foot = 0.3048 metres.
• exact_numerator/exact_denominator is the reduced exact rational result; value is rounded to decimal_places digits after the point using round-half-up, including trailing zeroes.
• Unit identity conversions still reduce the input decimal to an exact fraction. The input object is never mutated.
• More than 32 UTF-8 bytes in value is limit_exceeded before decimal syntax validation; decimal_places is an integer from 0 through 18.

Input

• value (string, required): min length 1; max length 32; pattern ^(0|[1-9][0-9]*)(\.[0-9]+)?$
• from_unit (one of "metres_per_second", "kilometres_per_hour", "miles_per_hour", "knots", "feet_per_second", required)
• to_unit (one of "metres_per_second", "kilometres_per_hour", "miles_per_hour", "knots", "feet_per_second", required)
• decimal_places (integer, required): min 0; max 18

Output

• value (string, required): pattern ^[0-9]+(\.[0-9]+)?$
• unit (one of "metres_per_second", "kilometres_per_hour", "miles_per_hour", "knots", "feet_per_second", required)
• exact_numerator (string, required): pattern ^[0-9]+$
• exact_denominator (string, required): pattern ^[1-9][0-9]*$
• decimal_places (integer, required): min 0; max 18

Limits

• max value bytes: 32
• max decimal places: 18

Example

Request input:

{
  "value": "1",
  "from_unit": "metres_per_second",
  "to_unit": "kilometres_per_hour",
  "decimal_places": 3
}

Response:

{
  "result": {
    "value": "3.600",
    "unit": "kilometres_per_hour",
    "exact_numerator": "18",
    "exact_denominator": "5",
    "decimal_places": 3
  }
}

How to call it

MCP

Connect https://computefirst.net/mcp (setup), then call execute with:

{
  "id": "speed-unit-convert",
  "version": "1.0.0",
  "input": {
    "value": "1",
    "from_unit": "metres_per_second",
    "to_unit": "kilometres_per_hour",
    "decimal_places": 3
  }
}

HTTP (no key)

curl -X POST https://computefirst.net/v1/tools/speed-unit-convert/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"value":"1","from_unit":"metres_per_second","to_unit":"kilometres_per_hour","decimal_places":3}'

The machine-readable contract is at /v1/tools/speed-unit-convert/versions/1.0.0.

CLI

node cli.mjs run speed-unit-convert 1.0.0 --input input.json --base-url https://computefirst.net

Get the client at /clients/cli/.

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