🌊 Water & Utilities
Flow Rate Converter
Convert between LPM, LPH, m³/hr, GPM, L/s and CFM instantly. Enter any value and all units update at once.
📌 Common situation: Your pump nameplate says 500 LPM but your flow meter displays in LPH, and the datasheet from the European manufacturer lists m³/hr. This converter handles all three in one step.
📊 Converted Values
LPM (Litres/min)
—
LPH (Litres/hr)
—
m³/hr
—
m³/min
—
GPM (US)
—
L/s
—
CFM
—
💡 Quick memory aid: LPH = LPM × 60 | m³/hr = LPM ÷ 16.667 | GPM = LPM ÷ 3.785
Conversion Formulas
LPH = LPM × 60
m³/hr = LPM ÷ 16.667
m³/min = LPM ÷ 1000
GPM = LPM ÷ 3.785
L/s = LPM ÷ 60
CFM = LPM ÷ 28.317
m³/hr = LPM ÷ 16.667
m³/min = LPM ÷ 1000
GPM = LPM ÷ 3.785
L/s = LPM ÷ 60
CFM = LPM ÷ 28.317
All conversions go through LPM as the base unit. To convert between any two units, first convert to LPM then to your target unit.
Which Unit to Use?
- LPM — Indian industrial standard for pumps & piping
- LPH — Chemical dosing, water treatment, utility meters
- m³/hr — European pump datasheets, HVAC systems
- GPM — US-origin equipment, imported pumps
- L/s — Civil engineering, municipal water supply
- CFM — Compressed air systems, HVAC airflow
Common LPM to LPH Conversion Table
Quick reference for the most commonly used pump flow rates in Indian factories. Values rounded to nearest whole number.
| LPM | LPH | m³/hr | GPM (US) | L/s |
|---|---|---|---|---|
| 10 | 600 | 0.60 | 2.64 | 0.17 |
| 25 | 1,500 | 1.50 | 6.60 | 0.42 |
| 50 | 3,000 | 3.00 | 13.21 | 0.83 |
| 100 | 6,000 | 6.00 | 26.42 | 1.67 |
| 200 | 12,000 | 12.00 | 52.83 | 3.33 |
| 300 | 18,000 | 18.00 | 79.25 | 5.00 |
| 500 | 30,000 | 30.00 | 132.09 | 8.33 |
| 750 | 45,000 | 45.00 | 198.13 | 12.50 |
| 1000 | 60,000 | 60.00 | 264.17 | 16.67 |
| 1500 | 90,000 | 90.00 | 396.26 | 25.00 |
Flow Rate Unit Reference
| Unit | Full Name | Common Use in Industry | = 1 LPM |
|---|---|---|---|
| LPM | Litres per Minute | India industrial standard — pumps, piping | 1.000 LPM |
| LPH | Litres per Hour | Chemical dosing, water treatment, billing meters | 60 LPH |
| m³/hr | Cubic Metres per Hour | European pump datasheets, HVAC systems | 0.06 m³/hr |
| m³/min | Cubic Metres per Minute | Large industrial processes, compressed air | 0.001 m³/min |
| GPM | US Gallons per Minute | US-origin pumps and equipment | 0.264 GPM |
| L/s | Litres per Second | Civil/municipal water, hydraulic calculations | 0.0167 L/s |
| CFM | Cubic Feet per Minute | Compressed air systems, ventilation airflow | 0.0353 CFM |
How Flow Rate Conversion Works
Flow rate measures the volume of fluid passing a point per unit of time. All the units above measure the same physical quantity — they just use different time bases (per second, per minute, per hour) and different volume measures (litres, gallons, cubic metres, cubic feet).
LPM to LPH Formula
LPH = LPM × 60
Example: 250 LPM × 60 = 15,000 LPH
LPM to m³/hr Formula
m³/hr = LPM × 60 ÷ 1000 = LPM ÷ 16.667
Example: 500 LPM ÷ 16.667 = 30 m³/hr
LPM to GPM Formula
GPM = LPM ÷ 3.785
Example: 100 LPM ÷ 3.785 = 26.42 GPM
Practical Example — Pump Selection
A cooling tower pump is rated at 18 m³/hr on the datasheet. Your piping engineer needs the value in LPM and your flow meter logs in LPH.
18 m³/hr × 16.667 = 300 LPM
300 LPM × 60 = 18,000 LPH
18 m³/hr ÷ 3.785 × 60 = 79.25 GPM
300 LPM × 60 = 18,000 LPH
18 m³/hr ÷ 3.785 × 60 = 79.25 GPM
Frequently Asked Questions
Multiply LPM by 60. Since there are 60 minutes in an hour, 100 LPM = 6,000 LPH. To go from LPH back to LPM, divide by 60. This is the most common conversion in Indian factories where pumps are rated in LPM but flow meters log in LPH.
Divide LPM by 16.667 (or multiply by 0.06). This works because 1 m³ = 1000 litres and there are 60 minutes per hour: LPM × 60 ÷ 1000. So 500 LPM = 30 m³/hr. This conversion is frequently needed when matching Indian process requirements to European pump datasheets.
Both measure volume of liquid flowing per unit time. LPM (litres per minute) is used for pumps, piping and process equipment. LPH (litres per hour) is preferred for slower flow applications like chemical dosing pumps, water treatment systems and utility billing. 1 LPM = 60 LPH — same flow rate, different time base.
Multiply US GPM by 3.785. For example, 100 GPM × 3.785 = 378.5 LPM. This is important when selecting replacement pumps — a US-made pump rated at 50 GPM delivers 189.3 LPM. To convert LPM to GPM, divide by 3.785.
LPM (litres per minute) is the most widely used unit in Indian manufacturing plants for pump specifications, flow meters and piping design. m³/hr is also common, especially for larger industrial pumps and HVAC systems. LPH appears in utility metering, chemical dosing and water treatment applications.
Multiply CFM by 28.317. For example, 10 CFM × 28.317 = 283.17 LPM. CFM (cubic feet per minute) is commonly used for compressed air systems and ventilation. When sizing compressors in Indian plants, you often need to convert the CFM rating from US equipment to LPM or m³/min for comparison with local equipment.
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