Volume unit convert

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

Convert exact decimal volumes among SI, cubic, US liquid, and imperial units with explicit half-even rounding.

Use when you need to: convert volume units exactly · liters to US gallons · imperial gallons to liters.

Decide before calling

Read the versioned contract and the supported scope below. Reuse volume-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 volume-unit-convert@1.0.0 for convert volume units exactly. 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 volume units exactly
• liters to US gallons
• imperial gallons to liters
• convert cubic feet to cubic meters
• US fluid ounces to milliliters
• compare US and imperial gallons
• exact cubic inch volume conversion

Not supported

• convert mass or weight units
• convert dry-volume or cooking-cup units
• infer units from free-form text

Behavior

• Input value is a canonical signed base-10 decimal string without exponent notation or redundant leading zeros.
• Factors are exact rational liters per unit: the international inch is exactly 25.4 mm, the US liquid gallon is 231 cubic inches, and the imperial gallon is 4.54609 liters.
• US liquid and imperial gallons, quarts, pints, and fluid ounces are distinct units and are never aliases.
• exact_fraction is reduced; value uses integer round-half-to-even at optional precision 0..50 (default 18), then removes trailing fractional zeros and negative zero.
• All validation and arithmetic are synchronous, bounded, locale-independent, offline, and deterministic.

Input

• value (string, required): min length 1; max length 100; pattern ^[+-]?(?:0|[1-9][0-9]*)(?:\.[0-9]+)?$
• from_unit (one of "milliliter", "liter", "cubic_centimeter", "cubic_meter", "cubic_inch", "cubic_foot", "us_fluid_ounce", "us_pint", "us_quart", "us_gallon", "imperial_fluid_ounce", "imperial_pint", "imperial_quart", "imperial_gallon", required)
• to_unit (one of "milliliter", "liter", "cubic_centimeter", "cubic_meter", "cubic_inch", "cubic_foot", "us_fluid_ounce", "us_pint", "us_quart", "us_gallon", "imperial_fluid_ounce", "imperial_pint", "imperial_quart", "imperial_gallon", required)
• precision (integer, optional): min 0; max 50

Output

• value (string, required): min length 1; max length 256; pattern ^-?(?:0|[1-9][0-9]*)(?:\.[0-9]+)?$
• exact_fraction (string, required): min length 3; max length 512; pattern ^-?(?:0|[1-9][0-9]*)/[1-9][0-9]*$
• from_unit (one of "milliliter", "liter", "cubic_centimeter", "cubic_meter", "cubic_inch", "cubic_foot", "us_fluid_ounce", "us_pint", "us_quart", "us_gallon", "imperial_fluid_ounce", "imperial_pint", "imperial_quart", "imperial_gallon", required)
• to_unit (one of "milliliter", "liter", "cubic_centimeter", "cubic_meter", "cubic_inch", "cubic_foot", "us_fluid_ounce", "us_pint", "us_quart", "us_gallon", "imperial_fluid_ounce", "imperial_pint", "imperial_quart", "imperial_gallon", required)

Limits

• max input bytes: 256
• max value chars: 100
• max precision: 50
• max output bytes: 1024

Example

Request input:

{
  "value": "1",
  "from_unit": "us_gallon",
  "to_unit": "liter"
}

Response:

{
  "result": {
    "value": "3.785411784",
    "exact_fraction": "473176473/125000000",
    "from_unit": "us_gallon",
    "to_unit": "liter"
  }
}

How to call it

MCP

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

{
  "id": "volume-unit-convert",
  "version": "1.0.0",
  "input": {
    "value": "1",
    "from_unit": "us_gallon",
    "to_unit": "liter"
  }
}

HTTP (no key)

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

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

CLI

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

Get the client at /clients/cli/.

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