Volumetric flow rate.
Cubic Kilometer per Seconds to Cubic Millimeter per Seconds Converter — km3/s to mm3/s
Convert Cubic Kilometer per Seconds (km3/s) to Cubic Millimeter per Seconds (mm3/s) using the exact conversion factor (1 cubic kilometer per seconds = 1e+18 cubic millimeter per seconds). See the formula, worked examples, and conversion table.
Cubic Kilometer per Seconds to Cubic Millimeter 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 1e+9 / 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 Kilometer per Seconds to Cubic Millimeter per Seconds
Cubic Kilometer per Seconds and Cubic Millimeter 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. Both are volumetric flow rate units.
Formula
cubic millimeter per seconds = cubic kilometer per seconds × 1e+18
This factor comes from each unit's defined relationship to the category's base unit: 1 cubic kilometer per seconds equals 1000000000 base units, and 1 cubic millimeter per seconds equals 1e-9 base units, so dividing one by the other gives the direct cubic kilometer per seconds-to-cubic millimeter per seconds factor of 1e+18.
Simple example
1 km3/s × 1e+18 = 1e+18 mm3/s
1 cubic kilometer per seconds = 1e+18 cubic millimeter per seconds.
Real-world example
60 km3/s × 1e+18 = 6e+19 mm3/s
60 cubic kilometer per seconds = 6e+19 cubic millimeter per seconds.
Conversion table
| Cubic Kilometer per Seconds (km3/s) | Cubic Millimeter per Seconds (mm3/s) |
|---|---|
| 0.1 km3/s | 1e+17 mm3/s |
| 1 km3/s | 1e+18 mm3/s |
| 10 km3/s | 1e+19 mm3/s |
| 60 km3/s | 6e+19 mm3/s |
| 100 km3/s | 1e+20 mm3/s |
| 1,000 km3/s | 1e+21 mm3/s |
Reverse conversion: Cubic Millimeter per Seconds to Cubic Kilometer per Seconds
1e+18 mm3/s × 1e-18 = 1 km3/s
1e+18 cubic millimeter per seconds = 1 cubic kilometer per seconds.
cubic kilometer per seconds = cubic millimeter per seconds × 1e-18
For a page dedicated to this direction, see Cubic Millimeter per Seconds to Cubic Kilometer per Seconds.
Understanding the Cubic Kilometer per Seconds (km3/s)
Volumetric flow rate.
Understanding the Cubic Millimeter per Seconds (mm3/s)
Volumetric flow rate.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many cubic millimeter per seconds are in 1 cubic kilometer per seconds?
1 cubic kilometer per seconds equals 1e+18 cubic millimeter per seconds, using the exact defined conversion factor rather than an estimate.
How do I convert cubic kilometer per seconds to cubic millimeter per seconds?
Multiply the cubic kilometer per seconds value by 1e+18. The converter above does this instantly to whatever precision you set.
How do I convert cubic millimeter per seconds back to cubic kilometer per seconds?
Use the reverse factor: 1 cubic millimeter per seconds equals 1e-18 cubic kilometer per seconds. You can also use the swap control in the converter above to flip the direction instantly.
What is a cubic kilometer per seconds?
Cubic Kilometer per Seconds (km3/s) is a unit of flow rate.
What is a cubic millimeter per seconds?
Cubic Millimeter per Seconds (mm3/s) is a unit of flow rate.
Is the cubic kilometer per seconds to cubic millimeter per seconds conversion exact?
Yes. Both cubic kilometer per seconds and cubic millimeter per seconds are defined by fixed standards rather than physical artifacts, so the factor of 1e+18 used above is exact to as many digits as you choose to display.
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.