How to convert curies to becquerels

To convert activity from Ci to Bq, multiply the value by the factor: 1 Ci = 3.7e+10 Bq. Enter a number in the field above for an instant result.

The relation is exact: 1 curie (Ci) = 3.7·10¹⁰ becquerels (Bq) by definition. The becquerel is the SI unit — one decay per second; the curie is a non-SI unit, historically the activity of 1 g of radium-226.

Use it to convert source activities from certificates, datasheets and regulations. Need other units (mCi, GBq, dpm)? The full activity converter has them all.

Examples: 1 Ci = 3.7e+10 Bq; 10 Ci = 3.7e+11 Bq; 100 Ci = 3.7e+12 Bq; 1,000 Ci = 3.7e+13 Bq; 1,000,000 Ci = 3.7e+16 Bq. Reverse: 1 Bq = 2.7027e-11 Ci.