Convert Pounds per Hour per Square Foot to Kilograms per Second per Square Meter
Pound per Hour per Square Foot (lb/(h·ft²)) to Kilogram per Second per Square Meter (kg/(s·m²)) mass flux density conversion — enter any value below to get an instant result, or use the table for common values.
Results from this calculator are estimates provided for general informational purposes only, based on formulas, rates, and standards commonly accepted as of 2026. Figures may differ slightly from other calculators or professional sources due to rounding methods, differing assumptions, or regional regulations, and rules may change over time. Always consult a qualified professional — such as a financial advisor, healthcare provider, or other relevant specialist — before making decisions based on these results.
Result
1 lb/(h·ft²) = 0.00013562299 kg/(s·m²)
1 Pound per Hour per Square Foot = 0.00013562299 Kilograms per Second per Square Meter
1 Kilogram per Second per Square Meter = 7373.3811 Pounds per Hour per Square Foot
1 lb/(h·ft²) in every supported unit
Conversion chart: Pound per Hour per Square Foot to Kilograms per Second per Square Meter
Conversion table
| Pound per Hour per Square Foot (lb/(h·ft²)) | Kilogram per Second per Square Meter (kg/(s·m²)) |
|---|---|
| 0.01 lb/(h·ft²) | 1.35623E-06 kg/(s·m²) |
| 0.1 lb/(h·ft²) | 1.35623E-05 kg/(s·m²) |
| 1 lb/(h·ft²) | 0.00013562299 kg/(s·m²) |
| 2 lb/(h·ft²) | 0.00027124598 kg/(s·m²) |
| 3 lb/(h·ft²) | 0.00040686897 kg/(s·m²) |
| 5 lb/(h·ft²) | 0.00067811496 kg/(s·m²) |
| 10 lb/(h·ft²) | 0.0013562299 kg/(s·m²) |
| 20 lb/(h·ft²) | 0.0027124598 kg/(s·m²) |
| 50 lb/(h·ft²) | 0.0067811496 kg/(s·m²) |
| 100 lb/(h·ft²) | 0.013562299 kg/(s·m²) |
| 1000 lb/(h·ft²) | 0.13562299 kg/(s·m²) |
Pound per Hour per Square Foot (lb/(h·ft²))
Definition: The standard US customary mass flux density unit — pounds of mass passing through one square foot of surface, per hour.
History: Built from the pound, hour, and square foot, the everyday US customary units used throughout American process and chemical engineering.
Current use: The standard unit on US membrane-filtration, spray-drying, and evaporator specification sheets, matching the customary units used across American process design.
Kilogram per Second per Square Meter (kg/(s·m²))
Definition: The SI derived base unit of mass flux density — the kilograms of mass currently passing through one square meter of surface, every second.
History: Formed directly from the kilogram, second, and square meter once all three were standardized as SI units, giving mass-transfer engineering a coherent mass-per-area-per-time unit.
Current use: The standard unit in membrane science, chemical engineering, and process-design literature wherever mass-transfer rates are reported in strict SI terms.
Supported Units
| Unit | Symbol | In kg/(s·m²) |
|---|---|---|
| Kilogram per Second per Square Meter | kg/(s·m²) | 1 kg/(s·m²) |
| Kilogram per Hour per Square Meter | kg/(h·m²) | 0.0002777778 kg/(s·m²) |
| Gram per Second per Square Meter | g/(s·m²) | 0.001 kg/(s·m²) |
| Gram per Second per Square Centimeter | g/(s·cm²) | 10 kg/(s·m²) |
| Kilogram per Hour per Square Foot | kg/(h·ft²) | 2.98998E-05 kg/(s·m²) |
| Pound per Hour per Square Foot | lb/(h·ft²) | 0.00013562299 kg/(s·m²) |
| Pound per Second per Square Foot | lb/(s·ft²) | 4.8824277 kg/(s·m²) |
About These Parameters
- Value
- The mass flux density value you want to convert, expressed in the "From" unit. Accepts decimals.
- From Unit
- The unit your input value is currently measured in — a lab report's g/(s·cm²), or a US plant's lb/(h·ft²).
- To Unit
- The unit you want the result converted into. Use the swap button to flip From and To instantly.
How Mass Flux Density Conversion Works
The Formula
Every unit here is defined by a fixed multiplier relative to kilograms per second per square meter. To convert a value from one unit to another:
result = value × (factor of "From" unit ÷ factor of "To" unit)
For Pound per Hour per Square Foot → Kilogram per Second per Square Meter: multiply by 0.00013562299. For example, 1 lb/(h·ft²) × 0.00013562299 = 0.00013562299 kg/(s·m²).
Mass Flux Density vs. Mass Flow Rate
Mass flux density is a mass flow rate that has been normalized by the area it passes through: mass flux density = mass flow rate ÷ area. The site's separate Flow - Mass Converter covers the un-normalized total flow rate (e.g. kilograms per second, with no area involved) — the reading you would get straight off a mass flow meter. Dividing that total flow by the cross-sectional or membrane area it flows through is what turns it into a mass flux density.
Why Area Normalization Matters
A large filtration membrane will naturally pass more total mass per second than a small one, even if the small membrane is actually performing better per unit of surface. Normalizing by area removes that size bias, letting engineers compare a lab-scale membrane coupon directly against a full production membrane module, or benchmark competing filter designs of different sizes on equal footing.
Example
A mass flux density of 1 lb/(h·ft²) equals 0.00013562299 kg/(s·m²). For scale, typical reverse-osmosis membranes operate around 0.01-0.03 kg/(s·m²) of permeate flux, while an industrial spray dryer's evaporation rate can run considerably higher per square meter of drying surface.
Frequently Asked Questions
How many Kilograms per Second per Square Meter are in 1 Pound per Hour per Square Foot?
1 Pound per Hour per Square Foot (lb/(h·ft²)) equals exactly 0.00013562299 Kilograms per Second per Square Meter (kg/(s·m²)).
What is mass flux density used for?
Mass flux density is used to quantify how fast material moves through a unit area — most commonly membrane permeation rates in reverse-osmosis and ultrafiltration systems, evaporation and drying rates off a material's surface, and mass-transport rates in chemical process design.
How is mass flux density different from mass flow rate?
Mass flow rate is the total mass moving per unit time (e.g. kilograms per second), with no reference to area. Mass flux density divides that flow rate by the area it passes through, giving a per-area rate that lets surfaces of different sizes be compared fairly.
How accurate are these conversions?
Every conversion factor used here is the exact, internationally recognized relationship between the underlying mass, time, and area units — results are limited only by floating-point display precision, not by rounded conversion constants.
Why are there only seven units on this page?
Mass flux density is a specialized quantity used mainly in membrane science and process engineering, so unlike broader categories such as length or weight, only a handful of unit combinations (metric and US customary, at second and hour time scales) see any real-world use.