Volumetric flow rate.
Cubic Meter per Seconds to Cubic Kilometer per Seconds Converter — m3/s to km3/s
Convert Cubic Meter per Seconds (m3/s) to Cubic Kilometer per Seconds (km3/s) using the exact conversion factor (1 cubic meter per seconds = 1e-9 cubic kilometer per seconds). See the formula, worked examples, conversion table, and common uses.
Cubic Meter per Seconds to Cubic Kilometer per Seconds converter
Converter
Flow Rate Converter
Convert volumetric flow rates across metric, US, imperial, industrial, and scientific units.
Context values
Some unit families need one extra value for a physically accurate result.
Volumetric flow rate.
Result = input x 1 / 1e+9.
Flow rate uses cubic meters per second as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Cubic Meter per Seconds to Cubic Kilometer per Seconds
Cubic Meter per Seconds and Cubic Kilometer per Seconds both measure volumetric flow rate — how much volume passes a point over time — used to size pipes and pumps, monitor river or stream discharge, control industrial processes, and set medical infusion rates. Cubic Meter per Seconds is most often used for used by hydrologists and water-resource engineers internationally to report river and reservoir discharge at large scales.
Formula
cubic kilometer per seconds = cubic meter per seconds × 1e-9
This factor comes from each unit's defined relationship to the category's base unit: 1 cubic meter per seconds equals 1 base unit, and 1 cubic kilometer per seconds equals 1000000000 base units, so dividing one by the other gives the direct cubic meter per seconds-to-cubic kilometer per seconds factor of 1e-9.
Simple example
1 m3/s × 1e-9 = 1e-9 km3/s
1 cubic meter per seconds = 1e-9 cubic kilometer per seconds.
Real-world example
60 m3/s × 1e-9 = 6e-8 km3/s
60 cubic meter per seconds = 6e-8 cubic kilometer per seconds.
Conversion table
| Cubic Meter per Seconds (m3/s) | Cubic Kilometer per Seconds (km3/s) |
|---|---|
| 0.1 m3/s | 1e-10 km3/s |
| 1 m3/s | 1e-9 km3/s |
| 10 m3/s | 1e-8 km3/s |
| 60 m3/s | 6e-8 km3/s |
| 100 m3/s | 1e-7 km3/s |
| 1,000 m3/s | 0.000001 km3/s |
Reverse conversion: Cubic Kilometer per Seconds to Cubic Meter per Seconds
1e-9 km3/s × 1000000000 = 1 m3/s
1e-9 cubic kilometer per seconds = 1 cubic meter per seconds.
cubic meter per seconds = cubic kilometer per seconds × 1000000000
For a page dedicated to this direction, see Cubic Kilometer per Seconds to Cubic Meter per Seconds.
Understanding the Cubic Meter per Seconds
Cubic Meter per Seconds (m3/s) measures volumetric flow rate. The SI coherent unit for volumetric flow rate — one cubic meter of volume passing a point every second. It is classified as a SI coherent derived unit.
Where it's used: Used internationally in hydrology and large-scale water-resource engineering
Uses of the Cubic Meter per Seconds today
- Used by hydrologists and water-resource engineers internationally to report river and reservoir discharge at large scales
Understanding the Cubic Kilometer per Seconds (km3/s)
Volumetric flow rate.
Cubic Meter per Seconds — sources
- BIPM SI Brochure — Cubic meter per second as the SI coherent derived unit for volumetric flow rate.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many cubic kilometer per seconds are in 1 cubic meter per seconds?
1 cubic meter per seconds equals 1e-9 cubic kilometer per seconds, using the exact defined conversion factor rather than an estimate.
How do I convert cubic meter per seconds to cubic kilometer per seconds?
Multiply the cubic meter per seconds value by 1e-9. The converter above does this instantly to whatever precision you set.
How do I convert cubic kilometer per seconds back to cubic meter per seconds?
Use the reverse factor: 1 cubic kilometer per seconds equals 1,000,000,000 cubic meter per seconds. You can also use the swap control in the converter above to flip the direction instantly.
What is a cubic meter per seconds?
Cubic Meter per Seconds (m3/s) measures volumetric flow rate. The SI coherent unit for volumetric flow rate — one cubic meter of volume passing a point every second. It is classified as a SI coherent derived unit.
What is a cubic kilometer per seconds?
Cubic Kilometer per Seconds (km3/s) is a unit of flow rate.
Is the cubic meter per seconds to cubic kilometer per seconds conversion exact?
Yes. Both cubic meter per seconds and cubic kilometer per seconds are defined by fixed standards rather than physical artifacts, so the factor of 1e-9 used above is exact to as many digits as you choose to display.
Where is the cubic meter per seconds still used today?
Used internationally in hydrology and large-scale water-resource engineering
What's the difference between volumetric and mass flow rate?
Volumetric flow rate measures the volume of fluid passing a point per unit time (for example, liters per second). Mass flow rate measures the mass instead. For a fluid of constant density the two are directly proportional, but for compressible fluids like gases, mass flow is often the more meaningful quantity.