Convert Litres per Second to Cumecs (L/s to m3/s)
1 litre per second (L/s) = 0.001 cumecs (m³/s). 1 m³/s = 1000 L/s. Example: 15 L/s = 15 × 0.001 = 0.015 m³/s.
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1 L/s = 0.001 m³/s
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk litre per second to cumec converter to paste a column from Excel.
How to Convert Litre per Second to Cumec
- 1 L/s = 0.001 m³/s
- 1 m³/s = 1000 L/s
- Example: convert 15 L/s to m³/s: 15 L/s = 15 × 0.001 m³/s = 0.015 m³/s
Formula
m³/s = L/s ÷ 1000
Derivation from SI units:
- 1 L/s = 10⁻³ m³/s.
- 1 cumec = 1 m³/s.
Both units are defined exactly, so the factor is exact. Litre per Second definition: litre per second; Cumec definition: cumec.
Worked examples
- A reading of 5 L/s converts to 0.005 m³/s.
5 L/s × 0.001 = 0.005 m³/s - A value of 50 L/s is 0.05 m³/s.
50 L/s × 0.001 = 0.05 m³/s
Litre per Second to Cumec conversion table
| Litres per Second (L/s) | Cumecs (m³/s) |
|---|---|
| 0.5 L/s | 0.0005 m³/s |
| 1 L/s | 0.001 m³/s |
| 2 L/s | 0.002 m³/s |
| 5 L/s | 0.005 m³/s |
| 10 L/s | 0.01 m³/s |
| 25 L/s | 0.025 m³/s |
| 50 L/s | 0.05 m³/s |
| 100 L/s | 0.1 m³/s |
| 500 L/s | 0.5 m³/s |
| 1000 L/s | 1 m³/s |
Where it's used
Litres per Second are used for tube-well and pump discharge, while cumecs appear in river and flood discharge. Both measure volumetric discharge of rivers, canals and water supply, so the conversion is a fixed factor.
Litre per Second to other water discharge units
| Conversion | 1 L/s equals |
|---|---|
| litre per second to cumec | 0.001 m³/s |
| litre per second to cusec | 0.03531466672 ft³/s |
| litre per second to MLD | 0.0864 MLD |
| litre per second to cubic metre per day | 86.4 m³/day |
| litre per second to MGD | 0.02282446532 MGD |
| litre per second to MGD (imp) | 0.01900534305 MGD (imp) |
| litre per second to acre-foot per day | 0.07004561994 acre-ft/day |
Frequently asked questions
How many cumecs are in 1 litre per second?
1 L/s = 0.001 m³/s.
How do I convert litres per second to cumecs?
Multiply the value in L/s by 0.001, or divide it by 1000. For example, 15 L/s × 0.001 = 0.015 m³/s.
Is the L/s to m³/s conversion exact?
Yes. Both units are defined exactly, and 1 L/s is exactly 0.001 m³/s.
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 Litres per Second to Cumecs (L/s to m3/s). Retrieved October 29, 2026, from https://scientificconverters.com/discharge/liters-per-second-to-cumecs/
IEEE
Scientific Converters, "Convert Litres per Second to Cumecs (L/s to m3/s)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/discharge/liters-per-second-to-cumecs/