Tanod Util

utilpeek: convert units of measurement (exact factors)

convert_units

Read-onlyIdempotent

utilpeek: Convert units of measurement: length, weight, temperature, volume, pressure, energy, data size. Returns a value converted between two units of one category, with the exact factor: length, mass, temperature (with offsets), volume (US and imperial), area, speed, pressure, energy, power, data size (kB = 1000 bytes, KiB = 1024), time and fuel economy (reciprocal). Input: value, from and to. Cross-category or unknown units, ambiguous spellings (KB), temperatures below absolute zero and 0 into a reciprocal fuel unit are a 422 before any payment (not charged). gal, qt, pt, cup and fl_oz are US; the imperial ones end in _imp. Typically under 0.1 s. Price: USD 0.001. Free: 10 utilpeek calls per IP per UTC day. Docs: https://tanod.dev/learn/unit-conversion-api.html

Input Schema

TableJSON Schema

Name	Required	Description
`to`	Yes	Unit to convert to, of the same category as `from`.
`from`	Yes	Unit to convert from: a symbol or name such as in, ft, mi, kg, lb, C, F, K, L, gal, gal_imp, m2, acre, km/h, mph, kn, psi, inHg, atm, kWh, BTU, eV, hp, kB, KiB, Mbit, h, L/100km, mpg, mpg_imp. Case matters only where it must (kB vs kb, MB vs Mb).
`value`	Yes	The number to convert (at most 1e300 in magnitude).

Output Schema

TableJSON Schema

Name	Required	Description
`to`	No
`from`	No
`kind`	No
`error`	No	Only on an error result: an object {code, message}, or the reason string of an x402 PaymentRequired object.
`value`	No
`factor`	No
`offset`	No
`result`	No
`formula`	No
`to_name`	No
`category`	No
`from_name`	No
`factor_exact`	No
`offset_exact`	No
`factor_decimal`	No
`offset_decimal`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 8, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "properties": {
+    "category": {
+      "enum": [
+        "length",
+        "mass",
+        "temperature",
+        "volume",
+        "area",
+        "speed",
+        "pressure",
+        "energy",
+        "power",
+        "data",
+        "time",
+        "fuel_economy",
+        null
+      ],
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "error": {
+      "description": "Only on an error result: an object {code, message}, or the reason string of an x402 PaymentRequired object."
+    },
+    "factor": {
+      "type": [
+        "number",
+        "null"
+      ]
+    },
+    "factor_decimal": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "factor_exact": {
+      "type": [
+        "boolean",
+        "null"
+      ]
+    },
+    "formula": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "from": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "from_name": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "kind": {
+      "enum": [
+        "multiply",
+        "affine",
+        "reciprocal",
+        null
+      ],
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "offset": {
+      "type": [
+        "number",
+        "null"
+      ]
+    },
+    "offset_decimal": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "offset_exact": {
+      "type": [
+        "boolean",
+        "null"
+      ]
+    },
+    "result": {
+      "type": [
+        "number",
+        "null"
+      ]
+    },
+    "to": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "to_name": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "value": {
+      "type": [
+        "number",
+        "null"
+      ]
+    }
+  },
+  "type": "object"
+}

AddedOct 8, 2026

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