Convert MCM to Gigalitres (MCM to GL)
1 million cubic metres (MCM) = 1 gigalitre (GL). 1 GL = 1 MCM. Example: 15 MCM = 15 × 1 = 15 GL.
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1 MCM = 1 GL
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk MCM to gigalitre converter to paste a column from Excel.
How to Convert MCM to Gigalitre
- 1 MCM = 1 GL
- 1 GL = 1 MCM
- Example: convert 15 MCM to GL: 15 MCM = 15 × 1 GL = 15 GL
Formula
GL = MCM × 1
Derivation from SI units:
- 1 MCM = 10⁶ m³ = 1 hm³ (cubic hectometre).
- 1 GL = 10⁹ L = 10⁶ m³ = 1 MCM.
Both units are defined exactly, so the factor is exact. MCM definition: million cubic metres; Gigalitre definition: gigalitre.
Worked examples
- A reading of 5 MCM converts to 5 GL.
5 MCM × 1 = 5 GL - A value of 100 MCM is 100 GL.
100 MCM × 1 = 100 GL
MCM to Gigalitre conversion table
| MCM | Gigalitres (GL) |
|---|---|
| 0.1 MCM | 0.1 GL |
| 0.5 MCM | 0.5 GL |
| 1 MCM | 1 GL |
| 5 MCM | 5 GL |
| 10 MCM | 10 GL |
| 50 MCM | 50 GL |
| 100 MCM | 100 GL |
| 500 MCM | 500 GL |
| 1000 MCM | 1000 GL |
| 10000 MCM | 10000 GL |
Where it's used
MCM are used for CWC weekly reservoir storage bulletins, 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.
MCM to other water volume units
| Conversion | 1 MCM equals |
|---|---|
| MCM to gigalitre | 1 GL |
| MCM to BCM | 0.001 BCM |
| MCM to TMC | 0.03531466672 TMC |
| MCM to acre-foot | 810.7131938 acre-ft |
| MCM to cubic metre | 1000000 m³ |
| MCM to Mcft | 35.31466672 Mcft |
| MCM to MAF | 0.0008107131938 MAF |
| MCM to hectare-metre | 100 ha·m |
Show 2 more units
| MCM to megalitre | 1000 ML |
|---|---|
| MCM to cubic kilometre | 0.001 km³ |
Frequently asked questions
How many gigalitres are in 1 million cubic metres?
1 MCM = 1 GL.
How do I convert million cubic metres to gigalitres?
Multiply the value in MCM by 1. For example, 15 MCM × 1 = 15 GL.
Is the MCM to GL conversion exact?
Yes. Both units are defined exactly, and 1 MCM is exactly 1 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 MCM to Gigalitres (MCM to GL). Retrieved October 29, 2026, from https://scientificconverters.com/water-volume/mcm-to-gigaliters/
IEEE
Scientific Converters, "Convert MCM to Gigalitres (MCM to GL)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/water-volume/mcm-to-gigaliters/