Converting cubic feet per hour (ft3/h) to litres per hour (l/h) helps you compare flow measurements written in different units. This is useful when a specification uses cubic feet per hour, while a report, instrument, or project document expects litres per hour.
Both units describe the same parent measure: Volume Flow Rate. The conversion changes the unit used to express the rate without changing the actual amount of volume moving over time.
What Does Cubic Foot Per Hour Mean?
Cubic foot per hour is a unit of volume flow rate. Its symbol is ft3/h.
The unit combines two ideas:
- Cubic foot: a unit used to express volume.
- Per hour: the volume is measured over a one-hour period.
A reading in ft3/h tells you how much volume passes through a system during an hour. It may appear in equipment specifications, ventilation data, air-handling records, or other flow-related measurements.
What Does Litre Per Hour Mean?
Litre per hour is also a unit of volume flow rate. Its symbol is l/h.
It expresses the volume moving through a system over one hour, with the volume stated in litres. This unit is often useful when working with metric measurements or when a flow value needs to be recorded in a format familiar to a particular instrument or reporting system.
How Cubic Foot Per Hour Relates to Litre Per Hour
Cubic foot per hour and litre per hour measure the same type of quantity: volume flow rate. The difference is the volume unit used before the “per hour” time component.
To convert a value from ft3/h to l/h, the volume expressed in cubic feet must be represented in litres while the hourly rate remains unchanged. The conversion tool applies the relevant relationship between the two volume units and presents the result in l/h.
The general structure is:
Value in l/h = Value in ft3/h × the applicable cubic-foot-to-litre conversion relationship
The exact numerical factor is not stated here. Enter the ft3/h value into the converter to obtain the corresponding l/h result.
How to Convert ft3/h to l/h
- Identify the flow rate stated in cubic feet per hour.
- Confirm that the source unit is ft3/h, not a different cubic-foot unit.
- Enter the value into the cubic foot per hour field.
- Select litre per hour, shown as l/h, as the target unit.
- Review the result and retain the unit label when copying it into a report or calculation.
Keeping the unit symbols visible is important. A number without its unit can be misunderstood, especially when several flow-rate systems appear in the same document.
Why This Conversion Matters
Flow information is often shared between teams that use different measurement conventions. One supplier may list performance in ft3/h, while an operator may record readings in l/h. Converting the value creates a consistent basis for review.
This can help with:
- Comparing equipment specifications.
- Preparing technical reports.
- Recording process or system readings.
- Checking whether a stated flow rate matches a required unit.
- Communicating measurements across metric and non-metric documentation.
Practical Applications of Volume Flow Rate Conversion
Equipment Specifications
Manufacturers may describe a device’s flow performance in ft3/h. If a purchasing team or project document uses l/h, converting the value makes the specification easier to compare with other information.
System Monitoring
Flow readings can be collected in one unit and reported in another. A consistent conversion helps readers interpret the data without mentally switching between measurement systems.
Engineering and Maintenance Records
Maintenance teams often work from manuals, labels, and historical records created at different times. Converting ft3/h to l/h can make these records easier to align, provided the original unit and converted unit are both clearly shown.
Technical Communication
A conversion is also useful when people in different regions or departments follow different measurement practices. Stating the original value and the converted value improves traceability and reduces ambiguity.
Common Mistakes to Avoid
Confusing Volume With Volume Flow Rate
A cubic foot and a litre describe volume. Cubic foot per hour and litre per hour describe how quickly volume moves. The “per hour” part is essential.
Dropping the Time Component
Do not rewrite ft3/h as a volume-only unit. Removing “per hour” changes the measure and makes the result unsuitable for flow-rate comparisons.
Mixing Unit Symbols
Use ft3/h for cubic foot per hour and l/h for litre per hour. Clear symbols help prevent a flow-rate result from being mistaken for a simple volume measurement.
Rounding Too Early
If a conversion is part of a larger calculation, keep the converter’s displayed precision until the final step. Early rounding can affect later comparisons or totals.
Leaving Out the Source Unit
Always record the original unit alongside the converted result. This makes it easier to audit the calculation and confirm which relationship was used.
Quick Reference for Common Input Values
The table below lists the requested ft3/h input values. The corresponding numerical l/h results are not included because the conversion factor was not supplied. Use the conversion tool to calculate each result.
| Cubic Foot Per Hour (ft3/h) | Litre Per Hour (l/h) |
|---|---|
| 1 | Use the converter |
| 2 | Use the converter |
| 5 | Use the converter |
| 10 | Use the converter |
| 20 | Use the converter |
| 50 | Use the converter |
| 100 | Use the converter |
| 500 | Use the converter |
Key Takeaway
Cubic foot per hour to litre per hour is a volume flow rate conversion. It changes the volume unit from cubic feet to litres while keeping the hourly rate intact. Enter a value in ft3/h, select l/h, and use the converter for the corresponding result.
For clear records, show both the original value and the converted unit. This small step makes technical data easier to check, compare, and use.