Radioactivity
CitokCi
Convert curies (Ci) to kilocuries (kCi).
Factor1 Ci = 0.001 kCi
Converter
Ci
Accepts numbers or expressions, e.g. 150 + 14.7
Result
kCi
Rendered to 6 significant figures.
Formula
Formula
kCi = Ci × 0.001
Multiply any value in curies by 0.001 to obtain the value in kilocuries.
Worked example
Convert 1000 Ci to kCi.
- 01Start with 1000 Ci.
- 02Multiply by the conversion factor: 1000 × 0.001 = 1 kCi.
Result1000 Ci = 1 kCi
Conversion table
| Ci | kCi |
|---|---|
| 1 | 0.001 |
| 2 | 0.002 |
| 5 | 0.005 |
| 10 | 0.01 |
| 20 | 0.02 |
| 50 | 0.05 |
| 100 | 0.1 |
| 200 | 0.2 |
| 500 | 0.5 |
| 1000 | 1 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from Ci to kCi?
1 Ci equals 0.001 kCi. To convert, multiply the value in curies by 0.001.
How do I convert 1 Ci to kCi?
1 Ci = 0.001 kCi. For any value, multiply by 0.001.
How do I convert kCi back to Ci?
Divide by the same factor — or equivalently, multiply by 1000. So 1 kCi = 1000 Ci.
When would I need to convert curie to kilocurie?
Radioactivity (activity) conversions between Ci and kCi are routine in health physics, nuclear medicine ordering, environmental monitoring, radiopharmacy and reactor/accelerator-source documentation. The becquerel (Bq) is the SI unit; the curie (Ci) is the legacy unit (1 Ci ≡ 3.7×10¹⁰ Bq exactly). This category is strictly activity (decays per second) — it does NOT cover absorbed dose (Gy, rad), dose equivalent (Sv, rem), exposure or dose rate, all of which are different physical quantities and live in separate categories.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).