Convert Cumecs to Cubic Metres per Day (m3/s to m3/day)
1 cumec (m³/s) = 86400 cubic metres per day (m³/day). 1 m³/day = 0.00001157407407 m³/s. Example: 15 m³/s = 15 × 86400 = 1296000 m³/day.
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1 m³/s = 86400 m³/day
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk cumec to cubic metre per day converter to paste a column from Excel.
How to Convert Cumec to Cubic Metre per Day
- 1 m³/s = 86400 m³/day
- 1 m³/day = 0.00001157407407 m³/s
- Example: convert 15 m³/s to m³/day: 15 m³/s = 15 × 86400 m³/day = 1296000 m³/day
Formula
m³/day = m³/s × 86400
Derivation from SI units:
- 1 cumec = 1 m³/s.
- 1 m³/day = 1/86,400 m³/s; one kilolitre per day (KLD).
Both units are defined exactly, so the factor is exact. Cumec definition: cumec; Cubic Metre per Day definition: cubic metre per day.
Worked examples
- A reading of 5 m³/s converts to 432000 m³/day.
5 m³/s × 86400 = 432000 m³/day - A value of 100 m³/s is 8640000 m³/day.
100 m³/s × 86400 = 8640000 m³/day
Cumec to Cubic Metre per Day conversion table
| Cumecs (m³/s) | Cubic Metres per Day (m³/day) |
|---|---|
| 0.1 m³/s | 8640 m³/day |
| 0.5 m³/s | 43200 m³/day |
| 1 m³/s | 86400 m³/day |
| 5 m³/s | 432000 m³/day |
| 10 m³/s | 864000 m³/day |
| 50 m³/s | 4320000 m³/day |
| 100 m³/s | 8640000 m³/day |
| 500 m³/s | 43200000 m³/day |
| 1000 m³/s | 86400000 m³/day |
| 10000 m³/s | 864000000 m³/day |
Where it's used
Cumecs are used for river and flood discharge, while cubic metres per day appear in STP and ETP capacity (KLD). 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 cubic metre per day | 86400 m³/day |
| cumec to cusec | 35.31466672 ft³/s |
| cumec to MLD | 86.4 MLD |
| cumec to litre per second | 1000 L/s |
| 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 cubic metres per day are in 1 cumec?
1 m³/s = 86400 m³/day.
How do I convert cumecs to cubic metres per day?
Multiply the value in m³/s by 86400. For example, 15 m³/s × 86400 = 1296000 m³/day.
Is the m³/s to m³/day 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
- 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 Cubic Metres per Day (m3/s to m3/day). Retrieved October 29, 2026, from https://scientificconverters.com/discharge/cumecs-to-cubic-meters-per-day/
IEEE
Scientific Converters, "Convert Cumecs to Cubic Metres per Day (m3/s to m3/day)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/discharge/cumecs-to-cubic-meters-per-day/