Radiation Absorbed DoseRads to Grays

Rads to Grays

Snapshot

1 Rad equals 0.01 Grays. Conversion Encyclopedia uses the same fixed conversion basis across the calculator, common values, and reverse page for this page.

Reference basis: This conversion uses exact gray-based absorbed-dose definitions.
Example: For 0.1 Rads, the result equals 0.001 Grays.
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

0.01 Grays (Gy)

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Machine access

Available to apps and AI agents

Rads to Grays 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: radiation-absorbed-dose
Source unit: rads
Target unit: grays

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": "radiation-absorbed-dose",
  "value": 1,
  "from": "rads",
  "to": "grays"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "radiation-absorbed-dose",
    "value": 1,
    "from": "rads",
    "to": "grays",
    "result": {
      "raw": 0.01,
      "display": "0.01"
    },
    "canonicalPath": "/radiation-absorbed-dose/rads-to-grays/"
  }
}

Full API documentation

Explanation

Formula: Grays = Rads × 0.01. Why: the rad has the fixed definition 1 rad = 0.01 Gy, so the calculator normalizes through grays before applying the target scale.

Rads (rad): a legacy absorbed-dose unit tied to a fixed gray equivalent, where 1 rad equals exactly 0.01 Gy.

Grays (Gy): the SI derived unit of absorbed dose, equal to one joule of radiation energy deposited per kilogram of matter.

This route is useful when translating absorbed-dose values between legacy rad-based references and modern gray-based SI reporting in laboratory, industrial, and technical contexts.

This conversion is purely multiplicative because both units reduce through grays using fixed absorbed-dose definitions with no offset.

Method & Reference

Method basis: exact conversion formula shown in Snapshot.
Applied factor: 1 Rad = 0.01 Grays.
Consistency rule: calculator output and table values use the same constants and rounding policy.

Common Conversion Values

Rads (rad)	Grays (Gy)
0.1	0.001
1	0.01
10	0.1
100	1
1,000	10

Questions & answers

Frequently Asked Questions

How many grays are in 1 rad?

1 Rad equals 0.01 Grays on this page.

What exact relationship does this Rads to Grays page use for rad and gray?

This route uses the exact relationship 1 rad = 0.01 gray, so gray-based SI values and legacy rad values stay aligned across the page.

When would I convert rads to grays?

Use this route when restating absorbed-dose values across radiology, dosimetry, shielding, and laboratory reporting scales.

How do I reverse Rads to Grays?

Use the mirror Grays to Rads route; it applies the inverse relationship with the same absorbed-dose assumptions.