How to convert becquerels to curies

To convert activity from Bq to Ci, multiply the value by the factor: 1 Bq = 2.7027e-11 Ci. 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 Bq = 2.7027e-11 Ci; 10 Bq = 2.7027e-10 Ci; 100 Bq = 2.7027e-9 Ci; 1,000 Bq = 2.7027e-8 Ci; 1,000,000 Bq = 0.000027027 Ci. Reverse: 1 Ci = 3.7e+10 Bq.