Convert BCM to Gigalitres (BCM to GL)
1 billion cubic metres (BCM) = 1000 gigalitres (GL). 1 GL = 0.001 BCM. Example: 15 BCM = 15 × 1000 = 15000 GL.
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1 BCM = 1000 GL
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk BCM to gigalitre converter to paste a column from Excel.
How to Convert BCM to Gigalitre
- 1 BCM = 1000 GL
- 1 GL = 0.001 BCM
- Example: convert 15 BCM to GL: 15 BCM = 15 × 1000 GL = 15000 GL
Formula
GL = BCM × 1000
Derivation from SI units:
- 1 BCM = 10⁹ m³ = 1000 MCM = 1 km³.
- 1 GL = 10⁹ L = 10⁶ m³ = 1 MCM.
- 1 BCM = 1000 MCM ÷ 1 MCM per GL = 1000 GL
Both units are defined exactly, so the factor is exact. BCM definition: billion cubic metres; Gigalitre definition: gigalitre.
Worked examples
- A reading of 2 BCM converts to 2000 GL.
2 BCM × 1000 = 2000 GL - A value of 30 BCM is 30000 GL.
30 BCM × 1000 = 30000 GL
BCM to Gigalitre conversion table
| BCM | Gigalitres (GL) |
|---|---|
| 0.1 BCM | 100 GL |
| 0.5 BCM | 500 GL |
| 1 BCM | 1000 GL |
| 2 BCM | 2000 GL |
| 5 BCM | 5000 GL |
| 10 BCM | 10000 GL |
| 30 BCM | 30000 GL |
| 100 BCM | 100000 GL |
| 400 BCM | 400000 GL |
| 1000 BCM | 1000000 GL |
Where it's used
BCM are used for national water resources assessments, while gigalitres appear in australian dam storage. Both measure volume of stored or released water (reservoirs, river flows, allocations), so the conversion is a fixed factor.
BCM to other water volume units
| Conversion | 1 BCM equals |
|---|---|
| BCM to gigalitre | 1000 GL |
| BCM to MCM | 1000 MCM |
| BCM to TMC | 35.31466672 TMC |
| BCM to acre-foot | 810713.1938 acre-ft |
| BCM to cubic metre | 1000000000 m³ |
| BCM to Mcft | 35314.66672 Mcft |
| BCM to MAF | 0.8107131938 MAF |
| BCM to hectare-metre | 100000 ha·m |
Show 2 more units
| BCM to megalitre | 1000000 ML |
|---|---|
| BCM to cubic kilometre | 1 km³ |
Frequently asked questions
How many gigalitres are in 1 billion cubic metres?
1 BCM = 1000 GL.
How do I convert billion cubic metres to gigalitres?
Multiply the value in BCM by 1000. For example, 15 BCM × 1000 = 15000 GL.
Is the BCM to GL conversion exact?
Yes. Both units are defined exactly, and 1 BCM is exactly 1000 GL.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4 (derived units) and Table 8 (non-SI units accepted for use with the SI).
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert BCM to Gigalitres (BCM to GL). Retrieved October 29, 2026, from https://scientificconverters.com/water-volume/bcm-to-gigaliters/
IEEE
Scientific Converters, "Convert BCM to Gigalitres (BCM to GL)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/water-volume/bcm-to-gigaliters/