Convert Cusecs to Litres per Second (ft3/s to L/s)
1 cusec (ft³/s) = 28.31684659 litres per second (L/s). 1 L/s = 0.03531466672 ft³/s. Example: 15 ft³/s = 15 × 28.31684659 = 424.7526989 L/s.
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1 ft³/s = 28.31684659 L/s
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk cusec to litre per second converter to paste a column from Excel.
How to Convert Cusec to Litre per Second
- 1 ft³/s = 28.31684659 L/s
- 1 L/s = 0.03531466672 ft³/s
- Example: convert 15 ft³/s to L/s: 15 ft³/s = 15 × 28.31684659 L/s = 424.7526989 L/s
Formula
L/s = ft³/s × 28.316846592
Derivation from SI units:
- 1 cusec = 1 ft³/s = 0.028316846592 m³/s.
- 1 L/s = 10⁻³ m³/s.
- 1 ft³/s = 0.028316846592 m³/s ÷ 0.001 m³/s per L/s = 28.316846592 L/s
Both units are defined exactly, so the factor is exact. Cusec definition: cusec; Litre per Second definition: litre per second.
Worked examples
- A reading of 100 ft³/s converts to 2831.684659 L/s.
100 ft³/s × 28.31684659 = 2831.684659 L/s - A value of 5000 ft³/s is 141584.233 L/s.
5000 ft³/s × 28.31684659 = 141584.233 L/s
Cusec to Litre per Second conversion table
| Cusecs (ft³/s) | Litres per Second (L/s) |
|---|---|
| 1 ft³/s | 28.31684659 L/s |
| 10 ft³/s | 283.1684659 L/s |
| 35.3 ft³/s | 999.5846847 L/s |
| 100 ft³/s | 2831.684659 L/s |
| 500 ft³/s | 14158.4233 L/s |
| 1000 ft³/s | 28316.84659 L/s |
| 5000 ft³/s | 141584.233 L/s |
| 10000 ft³/s | 283168.4659 L/s |
| 50000 ft³/s | 1415842.33 L/s |
| 100000 ft³/s | 2831684.659 L/s |
Where it's used
Cusecs are used for canal and dam releases in India (e.g. Cauvery releases), 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.
Cusec to other water discharge units
| Conversion | 1 ft³/s equals |
|---|---|
| cusec to litre per second | 28.31684659 L/s |
| cusec to cumec | 0.02831684659 m³/s |
| cusec to MLD | 2.446575546 MLD |
| cusec to cubic metre per day | 2446.575546 m³/day |
| cusec to MGD | 0.6463168831 MGD |
| cusec to MGD (imp) | 0.5381713837 MGD (imp) |
| cusec to acre-foot per day | 1.983471074 acre-ft/day |
Frequently asked questions
How many litres per second are in 1 cusec?
1 ft³/s = 28.31684659 L/s.
How do I convert cusecs to litres per second?
Multiply the value in ft³/s by 28.31684659. For example, 15 ft³/s × 28.31684659 = 424.7526989 L/s.
Is the ft³/s to L/s conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "cubic foot per second".
- 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 Cusecs to Litres per Second (ft3/s to L/s). Retrieved October 29, 2026, from https://scientificconverters.com/discharge/cusecs-to-liters-per-second/
IEEE
Scientific Converters, "Convert Cusecs to Litres per Second (ft3/s to L/s)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/discharge/cusecs-to-liters-per-second/