mL/h to GPH Converter
Enter the flow rate in ml/h below to convert it to gph.
Convert mL/h to GPH (US)
Enter a value in ml/h (mL/h) to convert to gph (us) (GPH).
Milliliters per Hour to US Gallons per Hour Conversion Table
Table showing various milliliters per hour measurements converted to gph. Click any preset value or arrow to load it into the converter.
| mL/h (mL/h) | GPH (US) (GPH) |
|---|---|
| 1 mL/h | 0.000264172 GPH |
| 2 mL/h | 0.000528344 GPH |
| 2.5 mL/h | 0.00066043 GPH |
| 5 mL/h | 0.0013209 GPH |
| 10 mL/h | 0.0026417 GPH |
| 15 mL/h | 0.0039626 GPH |
| 20 mL/h | 0.0052834 GPH |
| 25 mL/h | 0.0066043 GPH |
| 30 mL/h | 0.0079252 GPH |
| 50 mL/h | 0.0132086 GPH |
How to Convert mL/h to GPH
To convert ml/h to gph, multiply the flow rate by the following conversion ratio: 0.000264172 gph/milliliters per hour.
Since one milliliters per hour is equal to 0.000264172 gph, you can use this simple formula to convert:
The flow rate in gph is equal to the flow rate in ml/h multiplied by 0.000264172.
For example, here's how to convert 5 ml/h to gph using the formula above.
How Many GPH Are in a Milliliters per Hour?
There are 0.000264172 gph in a milliliters per hour, which is why we use this value in the formula above.
Our milliliters per hour to us gallons per hour calculator automatically converts your flow rate measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
mL/h and gph are both units used to measure flow rate. Keep reading to learn more about each unit.
What Is a Milliliters per Hour?
A milliliters per hour is a unit of flow rate equal to 1/60,000 of a liters per minute (0.000016667 L/min). Medical IV infusion pump rate unit. [1]
The milliliters per hour is classified as a metric and SI-compatible unit of flow rate. mL/h can be abbreviated as mL/h; for example, 1 milliliters per hour can be written as 1 mL/h.
In the metric system, "milli" is the standard SI prefix for thousandths, or 10⁻³. This makes the milliliters per hour (mL/h) a convenient decimal multiple of the liters per minute (L/min).
In practice, ml/h (mL/h) are widely used across fine-tolerance laboratory, analytical, and micro-scale flow rate measurements within SI metric workflows, engineering documentation, and technical data sheets.
What Is a US Gallons per Hour?
A us gallons per hour is a unit of flow rate equal to 0.0630902 liters per minute (L/min), the base unit for flow rate. Equal to 1/60 GPM (0.06309 L/min). [2]
The us gallons per hour is classified as a US customary unit of flow rate. GPH can be abbreviated as GPH; for example, 1 us gallons per hour can be written as 1 GPH.
When working with gph (GPH) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, gph (GPH) are widely used across standard flow rate applications within US customary workflows, engineering documentation, and technical data sheets.
When converting flow rate between ml/h (mL/h) and gph (GPH), keep full floating-point precision (1 mL/h = 0.000264172 GPH; 1 GPH = 3,785.411784 mL/h) during intermediate calculations and round only the final us gallons per hour figure to match your instrument tolerance.
More Milliliters per Hour & US Gallons per Hour Conversions
Need to calculate in the opposite direction? Use our gph (us) to ml/h calculator to switch your starting unit immediately. You can also explore related tools such as converting gph (us) to ml/h, converting liters per hour to gph (us), or converting liters per minute to gpm (us).
Frequently Asked Questions
References
- [1]NIST SP 811 StandardNIST SP 811 (NIST SP 811 App. B.9 (Volume Divided by Time))·Flow Rate Metrology Standard — mL/h (mL/h) to GPH (US) (GPH)
- [2]NIST OWM SpecificationNIST OWM (SI Units — Volume & Flow Capacity)·Unit Specifications: Milliliters per Hour (mL/h) & US Gallons per Hour (GPH) (GPH)
- [3]BIPM ReferenceBIPM (Coherent Volumetric Flow Units (m³/s))·Conversion Factors & Mathematical Basis (mL/h to GPH)