LPM to CFM Calculator
Convert flow rates across all units — air, water & gas for smart home systems
Flow Rate Converter
Quick Presets
Common Flow Rate Spec Grid
Full LPM Conversion Table
| LPM | CFM | GPM | L/s | m³/hr |
|---|
Application Flow Rate Reference
| Device / System | Typical LPM | CFM | GPM | Use Case |
|---|---|---|---|---|
| Bathroom Exhaust Fan | 28–142 | 1–5 | 7–37 | HVAC ventilation |
| Smart Irrigation Valve | 10–40 | 0.35–1.4 | 2.6–10.6 | Lawn / garden watering |
| Aquarium / Fish Tank Pump | 100–1000 | 3.5–35.3 | 26–264 | Water circulation |
| Residential Pool Pump | 500–1500 | 17.7–53 | 132–396 | Pool filtration |
| Under-Sink Water Filter | 4–15 | 0.14–0.53 | 1–4 | Drinking water |
| Whole-House Water Filter | 30–60 | 1.1–2.1 | 8–16 | Household supply |
| Air Compressor (small) | 100–300 | 3.5–10.6 | 26–79 | Tools / inflation |
| HVAC Main Duct | 2800–8500 | 100–300 | — | Whole-home airflow |
| Residential Gas Meter | 280–850 | 10–30 | — | Natural gas / LP |
| Water Softener | 20–55 | 0.7–1.9 | 5–15 | Regeneration cycle |
Smart Home Flow Monitoring Tips
Converting LPM to CFM maybe seem hard at first but genuinely it is very easy when you understand the principle. LPM shows liters per minute, so how many liters flow through space during 60 seconds. Liter matches 0.001 cubic meter or 1000 cubic centimetres.
CFM is cubic feet per minute. Because both measure per minute, just convert the volume… From liters to cubic feet.
Easy way to convert LPM to CFM and CFM to LPM
The calculation of LPM to CFM is very simple. Take your value in LPM and multiply by 0.0353147. For instance, 75 L/min give around 2.65 CFM.
Putting all numbers in calculator gets old fast, so there are websites to do the work. Use a caluclator to save time.
Of CFM to LPM go just as easily. Multiply your CFM by 28.3168. So 1 CFM matches about 28.3 LPM.
Use a metric conversion online, and you get the result in seconds.
In compressed air and pneumatic tools you often need those conversions. Compressor in store can have 310 LPM, what is around 10.94 CFM. The inflator of Makita reaches 45 LPM, so approx a 1.59 CFM.
Being able to swap between the two help to compare tools with different units.
Online there are many free tools, that quickly change liters per minute to cubic feet per minute. Some even show tables and steps. Just search “74 l/min to cfm” or “35 liters per minute to cfm“, and you have the answer immediately.
One tricky spot trips many: is the result ACFM or SCFM. Using a normal converter, mind what you receive, actual cubic feet per minute or standard. That matters, especially for small flow through air under pressure.
do not forget also GPM, gallons per minute. For 15 GPM multiply by 3.78541, and you have 56.78 LPM. Later you can go to liters per second or cubic meters per hour, if required.
Flow calculator, that handles all three units together, saves alot of headache.
