Convert Gigalitres to BCM (GL to BCM)
1 gigalitre (GL) = 0.001 billion cubic metres (BCM). 1 BCM = 1000 GL. Example: 15 GL = 15 × 0.001 = 0.015 BCM.
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1 GL = 0.001 BCM
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk gigalitre to BCM converter to paste a column from Excel.
How to Convert Gigalitre to BCM
- 1 GL = 0.001 BCM
- 1 BCM = 1000 GL
- Example: convert 15 GL to BCM: 15 GL = 15 × 0.001 BCM = 0.015 BCM
Formula
BCM = GL ÷ 1000
Derivation from SI units:
- 1 GL = 10⁹ L = 10⁶ m³ = 1 MCM.
- 1 BCM = 10⁹ m³ = 1000 MCM = 1 km³.
- 1 GL = 1 MCM ÷ 1000 MCM per BCM = 0.001 BCM
Both units are defined exactly, so the factor is exact. Gigalitre definition: gigalitre; BCM definition: billion cubic metres.
Worked examples
- A reading of 5 GL converts to 0.005 BCM.
5 GL × 0.001 = 0.005 BCM - A value of 100 GL is 0.1 BCM.
100 GL × 0.001 = 0.1 BCM
Gigalitre to BCM conversion table
| Gigalitres (GL) | BCM |
|---|---|
| 0.1 GL | 0.0001 BCM |
| 0.5 GL | 0.0005 BCM |
| 1 GL | 0.001 BCM |
| 5 GL | 0.005 BCM |
| 10 GL | 0.01 BCM |
| 50 GL | 0.05 BCM |
| 100 GL | 0.1 BCM |
| 500 GL | 0.5 BCM |
| 1000 GL | 1 BCM |
| 10000 GL | 10 BCM |
Where it's used
Gigalitres are used for australian dam storage, while billion cubic metres appear in national water resources assessments. Both measure volume of stored or released water (reservoirs, river flows, allocations), so the conversion is a fixed factor.
Gigalitre to other water volume units
| Conversion | 1 GL equals |
|---|---|
| gigalitre to BCM | 0.001 BCM |
| gigalitre to MCM | 1 MCM |
| gigalitre to TMC | 0.03531466672 TMC |
| gigalitre to acre-foot | 810.7131938 acre-ft |
| gigalitre to cubic metre | 1000000 m³ |
| gigalitre to Mcft | 35.31466672 Mcft |
| gigalitre to MAF | 0.0008107131938 MAF |
| gigalitre to hectare-metre | 100 ha·m |
Show 2 more units
| gigalitre to megalitre | 1000 ML |
|---|---|
| gigalitre to cubic kilometre | 0.001 km³ |
Frequently asked questions
How many billion cubic metres are in 1 gigalitre?
1 GL = 0.001 BCM.
How do I convert gigalitres to billion cubic metres?
Multiply the value in GL by 0.001, or divide it by 1000. For example, 15 GL × 0.001 = 0.015 BCM.
Is the GL to BCM conversion exact?
Yes. Both units are defined exactly, and 1 GL is exactly 0.001 BCM.
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 Gigalitres to BCM (GL to BCM). Retrieved October 29, 2026, from https://scientificconverters.com/water-volume/gigaliters-to-bcm/
IEEE
Scientific Converters, "Convert Gigalitres to BCM (GL to BCM)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/water-volume/gigaliters-to-bcm/