Convert Cumecs to Litres per Second (m3/s to L/s)
1 cumec (m³/s) = 1000 litres per second (L/s). 1 L/s = 0.001 m³/s. Example: 15 m³/s = 15 × 1000 = 15000 L/s.
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1 m³/s = 1000 L/s
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk cumec to litre per second converter to paste a column from Excel.
How to Convert Cumec to Litre per Second
- 1 m³/s = 1000 L/s
- 1 L/s = 0.001 m³/s
- Example: convert 15 m³/s to L/s: 15 m³/s = 15 × 1000 L/s = 15000 L/s
Formula
L/s = m³/s × 1000
Derivation from SI units:
- 1 cumec = 1 m³/s.
- 1 L/s = 10⁻³ m³/s.
Both units are defined exactly, so the factor is exact. Cumec definition: cumec; Litre per Second definition: litre per second.
Worked examples
- A reading of 5 m³/s converts to 5000 L/s.
5 m³/s × 1000 = 5000 L/s - A value of 100 m³/s is 100000 L/s.
100 m³/s × 1000 = 100000 L/s
Cumec to Litre per Second conversion table
| Cumecs (m³/s) | Litres per Second (L/s) |
|---|---|
| 0.1 m³/s | 100 L/s |
| 0.5 m³/s | 500 L/s |
| 1 m³/s | 1000 L/s |
| 5 m³/s | 5000 L/s |
| 10 m³/s | 10000 L/s |
| 50 m³/s | 50000 L/s |
| 100 m³/s | 100000 L/s |
| 500 m³/s | 500000 L/s |
| 1000 m³/s | 1000000 L/s |
| 10000 m³/s | 10000000 L/s |
Where it's used
Cumecs are used for river and flood discharge, while litres per second appear in tube-well and pump discharge. Both measure volumetric discharge of rivers, canals and water supply, so the conversion is a fixed factor.
Cumec to other water discharge units
| Conversion | 1 m³/s equals |
|---|---|
| cumec to litre per second | 1000 L/s |
| cumec to cusec | 35.31466672 ft³/s |
| cumec to MLD | 86.4 MLD |
| cumec to cubic metre per day | 86400 m³/day |
| cumec to MGD | 22.82446532 MGD |
| cumec to MGD (imp) | 19.00534305 MGD (imp) |
| cumec to acre-foot per day | 70.04561994 acre-ft/day |
Frequently asked questions
How many litres per second are in 1 cumec?
1 m³/s = 1000 L/s.
How do I convert cumecs to litres per second?
Multiply the value in m³/s by 1000. For example, 15 m³/s × 1000 = 15000 L/s.
Is the m³/s to L/s conversion exact?
Yes. Both units are defined exactly, and 1 m³/s is exactly 1000 L/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 Cumecs to Litres per Second (m3/s to L/s). Retrieved October 29, 2026, from https://scientificconverters.com/discharge/cumecs-to-liters-per-second/
IEEE
Scientific Converters, "Convert Cumecs to Litres per Second (m3/s to L/s)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/discharge/cumecs-to-liters-per-second/