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Foot Pounds/minute/square foot to Btus (IT)/second/square foot Converter (ft·lbf/(min·ft²) to Btu/(s·ft²))

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Live Conversion • ISO 80000-5:2019 Certified
1 Foot pound/minute/square foot = 2.14178837 × 10⁻⁵ Btu (IT)/second/square foot
1 ft·lbf/(min·ft²) = 2.141788 × 10⁻⁵ Btu/(s·ft²) • 1 Btu/(s·ft²) = 46689.95388 ft·lbf/(min·ft²)
Foot pound/minute/square foot to Btu (IT)/second/square foot: One Foot pound/minute/square foot is equal to 2.14178837 × 10⁻⁵ Btus (IT)/second/square foot.
Certified Authority Value
0.00002142
Btu/(s·ft²)
Exact: 1 Btu/(s·ft²) ≡ 46689.9538804248 ft·lbf/(min·ft²)
ft·lbf/(min·ft²)
ft·lbf/(min·ft²)
Swap to Btu (IT)/second/square foot to Foot pound/minute/square foot
Swap to Btu (IT)/second/square foot to Foot pound/minute/square foot
Btu/(s·ft²)
Btu/(s·ft²) 2.14178837 × 10⁻⁵
Quick Values:
Conversion Formula
To convert Foot pound/minute/square foot to Btu (IT)/second/square foot, multiply by 2.14178837 × 10⁻⁵
ft·lbf/(min·ft²) × 2.14178837 × 10⁻⁵ = Btu/(s·ft²)

Calculation: 1 ft·lbf/(min·ft²) × 2.14178837 × 10⁻⁵ = 2.14178837 × 10⁻⁵ Btu/(s·ft²)

Common Foot pound/minute/square foot to Btu (IT)/second/square foot Calculations

Quick-lookup reference table showing calculated equivalents for standard increments between Foot pound/minute/square foot (ft·lbf/(min·ft²)) and Btu (IT)/second/square foot (Btu/(s·ft²)).

Tap any row to calculate
Foot pound/minute/square foot to Btu (IT)/second/square foot: Primary Direct Table (15 Steps)
Foot pound/minute/square foot to Btu (IT)/second/square foot Conversion Reference Table
Conversion & Equivalent Value Scientific Notation
0.001 ft·lbf/(min·ft²) 2.141788 × 10⁻⁸ Btu/(s·ft²) 2.142 × 10⁻⁸
0.01 ft·lbf/(min·ft²) 2.141788 × 10⁻⁷ Btu/(s·ft²) 2.142 × 10⁻⁷
0.1 ft·lbf/(min·ft²) 2.141788 × 10⁻⁶ Btu/(s·ft²) 2.142 × 10⁻⁶
0.5 ft·lbf/(min·ft²) 1.070894 × 10⁻⁵ Btu/(s·ft²) 1.071 × 10⁻⁵
1 ft·lbf/(min·ft²) 2.141788 × 10⁻⁵ Btu/(s·ft²) 2.142 × 10⁻⁵
2 ft·lbf/(min·ft²) 4.283577 × 10⁻⁵ Btu/(s·ft²) 4.284 × 10⁻⁵
5 ft·lbf/(min·ft²) 0.000107089 Btu/(s·ft²) 1.071 × 10⁻⁴
10 ft·lbf/(min·ft²) 0.000214179 Btu/(s·ft²) 2.142 × 10⁻⁴
20 ft·lbf/(min·ft²) 0.000428358 Btu/(s·ft²) 4.284 × 10⁻⁴
25 ft·lbf/(min·ft²) 0.000535447 Btu/(s·ft²) 5.354 × 10⁻⁴
50 ft·lbf/(min·ft²) 0.00107089 Btu/(s·ft²) 1.071 × 10⁻³
100 ft·lbf/(min·ft²) 0.00214179 Btu/(s·ft²) 2.142 × 10⁻³
250 ft·lbf/(min·ft²) 0.00535447 Btu/(s·ft²) 5.354 × 10⁻³
500 ft·lbf/(min·ft²) 0.0107089 Btu/(s·ft²) 1.071 × 10⁻²
1000 ft·lbf/(min·ft²) 0.0214179 Btu/(s·ft²) 2.142 × 10⁻²
Btu (IT)/second/square foot to Foot pound/minute/square foot: Reciprocal Summary
Btu (IT)/second/square foot to Foot pound/minute/square foot Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 Btu/(s·ft²) 46689.95388 ft·lbf/(min·ft²) 4.669 × 10⁴
5 Btu/(s·ft²) 233449.769402 ft·lbf/(min·ft²) 2.334 × 10⁵
10 Btu/(s·ft²) 466899.538804 ft·lbf/(min·ft²) 4.669 × 10⁵
50 Btu/(s·ft²) 2334497.694021 ft·lbf/(min·ft²) 2.334 × 10⁶
100 Btu/(s·ft²) 4668995.388042 ft·lbf/(min·ft²) 4.669 × 10⁶
View Complete 15-Row Btu (IT)/second/square foot to Foot pound/minute/square foot Table

Real-World Context & Everyday Benchmarks

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To help contextualize these units in everyday life, science, and engineering, here are verified real-world reference points for Foot pound/minute/square foot (ft·lbf/(min·ft²)) and Btu (IT)/second/square foot (Btu/(s·ft²)):

Foot pound/minute/square foot References:

  • Mechanical friction heating flux on brake drum friction lining 2500 ft·lbf/(min·ft²)

Btu (IT)/second/square foot References:

  • Atmospheric orbital reentry heat shield peak aerodynamic flux 50 Btu/(s·ft²)

Tap any benchmark above to automatically calculate its exact equivalent in Btu (IT)/second/square foot.

ISQ Dimension: [M T⁻³] Coherent SI Unit: watt per square meter (W/m²) Thermodynamics & Heat Transfer

How to Convert Foot pound/minute/square foot to Btu (IT)/second/square foot

Converting Foot pound/minute/square foot (ft·lbf/(min·ft²)) to Btu (IT)/second/square foot (Btu/(s·ft²)) is a core calculation in Heat Flux Density, which measures the rate of thermal energy transfer radiating or conducting through a unit area per second. This calculation navigates the boundary between the International Metric System (SI) and British Imperial / US Customary engineering standards. In contemporary metrology, Imperial units are defined in terms of exact SI standards via international agreements—notably NIST SP 811 and the 1959 International Yard and Pound Agreement. Exactly 1 Foot pound/minute/square foot equals 2.141788 × 10⁻⁵ Btu (IT)/second/square foot, while 1 Btu/(s·ft²) equals 46689.95388 ft·lbf/(min·ft²).

Direct Factor1 ft·lbf/(min·ft²) = 2.141788 × 10⁻⁵ Btu/(s·ft²)
Inverse Ratio1 Btu/(s·ft²) = 46689.95388 ft·lbf/(min·ft²)
Conversion ScaleMetric SI to British Imperial / US Customary Bridge
First-Principles SI Derivation ProofNIST SP 811 / ISO 80000 Compliance

Mathematical Conversion Derivation via Coherent SI Base Unit

Under the International System of Quantities (ISQ), dimensional conversion between non-SI units is rigorously resolved by bridging through the coherent SI base unit (watt per square meter (W/m²)) without arbitrary rounding:

Vtarget=Vsource×(ksource→SIktarget→SI)V_{\text{target}} = V_{\text{source}} \times \left( \frac{k_{\text{source} \to \text{SI}}}{k_{\text{target} \to \text{SI}}} \right)
Universal Dimensional Conversion Law (ISO 80000 / NIST SP 811)
1. Source SI Bridge (ksource):1 ft·lbf/(min·ft²) = 0.243233 watt per square meter (W/m²)
2. Target SI Bridge (ktarget):1 Btu/(s·ft²) = 11356.526682 watt per square meter (W/m²)
Step-by-step substitution for Foot pound/minute/square foot → Btu (IT)/second/square foot:V(Btu/(s·ft²)) = V(ft·lbf/(min·ft²)) × ( 0.243233 / 11356.526682 ) = V(ft·lbf/(min·ft²)) × 2.141788 × 10⁻⁵
Mathematical FormulaValue in Btu (IT)/second/square foot = Value in Foot pound/minute/square foot × 2.14178837 × 10⁻⁵Direct computational formula applied for standard conversion.
Worked Example

Converting 36 ft·lbf/(min·ft²) yields an exact output of 0.000771044 Btu/(s·ft²) in Btu (IT)/second/square foot. Under higher industrial throughput, 5000 ft·lbf/(min·ft²) translates to 0.107089 Btu/(s·ft²).

Inverse check: 1 Btu/(s·ft²) = 46689.95388 ft·lbf/(min·ft²).

Understanding Foot pound/minute/square foot and Btu (IT)/second/square foot

Foot pound/minute/square foot

ft·lbf/(min·ft²)
Imperial / US

A Foot pound/minute/square foot (ft·lbf/(min·ft²)) is an imperial and US customary unit for heat flux density.

Applications & Practical Context

In practical heat flux density terms, a mechanical friction heating flux on brake drum friction lining equals 2500 ft·lbf/(min·ft²).

Physical Setup

A physical magnitude of 1 ft·lbf/(min·ft²) corresponds to 0.243233 W/m² in standard SI measurement.

Conversion to SI Unit: watt per square meter (W/m²)
1 ft·lbf/(min·ft²) = 0.243233 W/m²

Btu (IT)/second/square foot

Btu/(s·ft²)
Imperial / US

A Btu (IT)/second/square foot (Btu/(s·ft²)) is an imperial and US customary unit for heat flux density.

Applications & Practical Context

In practical heat flux density terms, a atmospheric orbital reentry heat shield peak aerodynamic flux equals 50 Btu/(s·ft²).

Physical Setup

A physical magnitude of 1 Btu/(s·ft²) corresponds to 11356.526682 W/m² in standard SI measurement.

Conversion to SI Unit: watt per square meter (W/m²)
1 Btu/(s·ft²) = 11356.526682 W/m²

Domain Metrology & Engineering Applications

Governing Law & Equation

Thermal Transmission Flux (q = Q̇ / A)

Measurement Instrumentation

Rigorously quantified in laboratory and field settings using Schmidt-Boelter heat flux gauges, differential thermopile foil transducers, and calibrated Gardon radiant gauges.

Primary Industry Sectors

Applied across rocket nozzle combustion chamber analysis, fire resistance testing (ASTM E119), furnace wall heat loss auditing, and hypersonic aerothermal design under international metrology standard ISO 80000-5:2019, ASME PTC 19.3.

Institutional Metrology & Standard Authority:

Formulas, conversion coefficients, and base definitions on this page strictly adhere to the ISO 80000-5:2019, ASME PTC 19.3 and the BIPM SI Brochure (9th Edition). Governed by Thermal Transmission Flux (q = Q̇ / A) under ISO 80000 dimensional vector [M T⁻³].

Multi-Variable Engineering Bridge Thermal Radiation & Power Dissipation

Heat Flux Density to Total Thermal Power Bridge (Watts • Kilowatts • Megawatts • BTU/h • Horsepower)

Calculate total continuous heat dissipation power P = q" × A across surface barriers and exchangers, bridging heat flux density [M T⁻³] with thermal power [M L² T⁻³].

P = q" × A
Vector: [W/m²] × [m²] → [W]
Live Calculated Bridge Equivalent:
1 ft·lbf/(min·ft²) at Industrial Hydronic Radiator Panel (8 m²) = 1.9459 W
Equals 0.001946 kW • 1.945862 × 10⁻⁶ MW • 0.002609 hp
SI Power
1.9459
W
Watts
Grid / Utility
0.001946
kW
Kilowatts
Power Plant
1.945862 × 10⁻⁶
MW
Megawatts
Mechanical Rating
0.002609
hp
Horsepower (Mechanical)
Metric Horsepower
0.002646
PS
Metric Horsepower (PS)
HVAC Thermal Rating
6.64
BTU/h
BTU per Hour
  1. 1. Normalize Input to SI Base Unit (W/m²):
    q" = 1 ft·lbf/(min·ft²) × 0.24323277 = 0.24323277 W/m²
  2. 2. Apply Engineering Parameter (A):
    Selected condition: Industrial Hydronic Radiator Panel (8 m²) at A = 8 m²
  3. 3. Execute Governing Physical Law in SI Units:
    P = q" × A = (0.24323277 W/m²) × (8 m²) = 1.945862 W
  4. 4. Convert to Standard Engineering Units:
    • W: 1.945862 × 1 = 1.9459 W (Watts) • kW: 1.945862 × 0.001 = 0.001946 kW (Kilowatts) • MW: 1.945862 × 1 × 10⁻⁶ = 1.945862 × 10⁻⁶ MW (Megawatts) • hp: 1.945862 × 0.001341 = 0.002609 hp (Horsepower (Mechanical)) • PS: 1.945862 × 0.00136 = 0.002646 PS (Metric Horsepower (PS)) • BTU/h: 1.945862 × 3.4121 = 6.64 BTU/h (BTU per Hour)
Explore Full Power Converter →
Engineering Substance / Operating Standard Parameter Value (m²) Reference State / Condition Typical Industrial & Engineering Application
Residential Window Glazing (4 m²) 4 4.0 m² Double-pane exterior window glass aperture
Industrial Hydronic Radiator Panel (8 m²) 8 8.0 m² Convective space heating radiator surface
Shell & Tube Heat Exchanger (50 m²) 50 50.0 m² Industrial process fluid cooling bundle
Power Boiler Waterwall (200 m²) 200 200.0 m² Thermal power plant steam generator wall
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Frequently Asked Questions

There are exactly 2.14178837 × 10⁻⁵ btus (it)/second/square foot (Btu/(s·ft²)) in 1 foot pound/minute/square foot (ft·lbf/(min·ft²)). To calculate larger amounts manually, simply multiply your total number of foot pounds/minute/square foot by the conversion multiplier of 2.14178837 × 10⁻⁵.

The mathematical formula to convert foot pounds/minute/square foot to btus (it)/second/square foot is: [value] * 2.14178837 × 10⁻⁵ = btus (it)/second/square foot. Rather than doing the math manually, you can use our high-precision online calculator to process this exact equation instantly without rounding errors.

To perform the reverse calculation from btus (it)/second/square foot back to foot pounds/minute/square foot, you must divide your starting value by 2.14178837 × 10⁻⁵. Our bidirectional tool automatically computes this inverse equation the moment you type into the btu (it)/second/square foot input field.

1 Btu (IT)/second/square foot is larger than 1 Foot pound/minute/square foot. Specifically, 1 Foot pound/minute/square foot equals 2.14178837 × 10⁻⁵ btus (it)/second/square foot, meaning 1 Btu (IT)/second/square foot is 46689.9539 times larger than 1 Foot pound/minute/square foot (a difference of 4.67 orders of magnitude). Expressing measurements in foot pounds/minute/square foot requires a larger numerical value to represent the equivalent physical magnitude.

Under standard international measurement guidelines, 1 Foot pound/minute/square foot converts to 2.14178837 × 10⁻⁵ btus (it)/second/square foot. Precise numerical conversion factors ensure consistency across laboratory, engineering, and field data.