Convert Gigalitres to MCM (GL to MCM)
1 gigalitre (GL) = 1 million cubic metres (MCM). 1 MCM = 1 GL. Example: 15 GL = 15 × 1 = 15 MCM.
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1 GL = 1 MCM
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk gigalitre to MCM converter to paste a column from Excel.
How to Convert Gigalitre to MCM
- 1 GL = 1 MCM
- 1 MCM = 1 GL
- Example: convert 15 GL to MCM: 15 GL = 15 × 1 MCM = 15 MCM
Formula
MCM = GL × 1
Derivation from SI units:
- 1 GL = 10⁹ L = 10⁶ m³ = 1 MCM.
- 1 MCM = 10⁶ m³ = 1 hm³ (cubic hectometre).
Both units are defined exactly, so the factor is exact. Gigalitre definition: gigalitre; MCM definition: million cubic metres.
Worked examples
- A reading of 5 GL converts to 5 MCM.
5 GL × 1 = 5 MCM - A value of 100 GL is 100 MCM.
100 GL × 1 = 100 MCM
Gigalitre to MCM conversion table
| Gigalitres (GL) | MCM |
|---|---|
| 0.1 GL | 0.1 MCM |
| 0.5 GL | 0.5 MCM |
| 1 GL | 1 MCM |
| 5 GL | 5 MCM |
| 10 GL | 10 MCM |
| 50 GL | 50 MCM |
| 100 GL | 100 MCM |
| 500 GL | 500 MCM |
| 1000 GL | 1000 MCM |
| 10000 GL | 10000 MCM |
Where it's used
Gigalitres are used for australian dam storage, while million cubic metres appear in CWC weekly reservoir storage bulletins. 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 MCM | 1 MCM |
| gigalitre to BCM | 0.001 BCM |
| 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 million cubic metres are in 1 gigalitre?
1 GL = 1 MCM.
How do I convert gigalitres to million cubic metres?
Multiply the value in GL by 1. For example, 15 GL × 1 = 15 MCM.
Is the GL to MCM conversion exact?
Yes. Both units are defined exactly, and 1 GL is exactly 1 MCM.
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 MCM (GL to MCM). Retrieved October 29, 2026, from https://scientificconverters.com/water-volume/gigaliters-to-mcm/
IEEE
Scientific Converters, "Convert Gigalitres to MCM (GL to MCM)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/water-volume/gigaliters-to-mcm/