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. Conversion Encyclopedia uses the same fixed conversion basis across the calculator, common values, and reverse page for this page.

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.

Use the interactive calculator below for custom values and the common-value table for quick checks.

Interactive conversion

Converter Calculator

37,000,000,000 Becquerels (Bq)

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Machine access

Available to apps and AI agents

Curies to Becquerels 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-activity
Source unit: curies
Target unit: becquerels

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-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/"
  }
}

Full API 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.

Values are calculated from one explicit conversion basis.
Displayed results are rounded only after the underlying calculation.
Real measured materials and ingredients can vary from the stated reference basis.
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

How many becquerels are in 1 curie?

1 Curie equals 37,000,000,000 Becquerels on this page.

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.