Radiation ActivityCuries to Becquerels

Curies to Becquerels

Updated: July 25, 2026 · Source: U.S. Nuclear Regulatory Commission: units of radioactivity (The NRC defines one curie as 3.7 × 10^10 becquerels.)

Methodology·How We Verify

Snapshot

1 curie equals exactly 37,000,000,000 becquerels.

Reference basis: Multiply curies by 37,000,000,000 to obtain becquerels. The relationship is defined exactly for unit conversion.
Example: For 0.001 curie, the result is 37,000,000 becquerels.
Source basis: U.S. Nuclear Regulatory Commission: units of radioactivity.

Interactive conversion

Converter Calculator

Decimals: 1.5 or 1,5. Fractions: 1/2. Scientific notation: 1e3. Write 1000 without grouping separators.

37,000,000,000 Becquerels (Bq)

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API and AI agent access

Curies to Becquerels.

Machine-readable identifiers

Conversion family: radiation-activity
Source unit: curies
Target unit: becquerels

Use these identifiers in the API request. Sources and model limits also apply to software clients.

Example API request and response

POST /api/v1/convert

Request

{
  "family": "radiation-activity",
  "value": 1,
  "from": "curies",
  "to": "becquerels"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "radiation-activity",
    "value": 1,
    "from": "curies",
    "to": "becquerels",
    "result": {
      "raw": 37000000000,
      "display": "37,000,000,000"
    },
    "canonicalPath": "/radiation-activity/curies-to-becquerels/"
  }
}

API, OpenAPI and WebMCP documentation

Explanation

Curie and becquerel both measure radioactive activity, not absorbed dose or biological effect. A becquerel is one nuclear transformation per second, while the curie is a much larger legacy unit.

Multiply curies by 37,000,000,000 to obtain becquerels. The relationship is defined exactly for unit conversion.

Conversion Basis

Multiply curies by 37,000,000,000 to obtain becquerels. The relationship is defined exactly for unit conversion.
For 0.001 curie, the result is 37,000,000 becquerels.
The snapshot, calculator, common values, and reverse route use the same conversion basis.
Source: U.S. Nuclear Regulatory Commission: units of radioactivity (The NRC defines one curie as 3.7 × 10^10 becquerels.)

Reference & Scope

The NRC definition states that one curie equals 3.7 × 10^10 nuclear transformations per second, or becquerels.

Source: U.S. Nuclear Regulatory Commission: units of radioactivity (The NRC defines one curie as 3.7 × 10^10 becquerels.)

Common Conversion Values

Curies (Ci)	Becquerels (Bq)
0.000001	37,000
0.001	37,000,000
0.01	370,000,000
0.1	3,700,000,000
1	37,000,000,000
2	74,000,000,000
5	185,000,000,000
10	370,000,000,000

Questions & answers

Frequently Asked Questions

What exact relationship does this Curies to Becquerels page use for curies and becquerels?

This route uses the exact relationship 1 curie = 3.7 × 10^10 becquerels, so curie-based and becquerel-based activity values stay aligned across the page.

When would I convert curies to becquerels?

Use this route when restating radioactivity values across laboratory, medical, industrial, or regulatory reporting scales.

How do I reverse Curies to Becquerels?

Use the mirror Becquerels to Curies route; it applies the inverse relationship with the same radiation-activity assumptions.