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Metric Horsepowers/square foot to Btus (th)/second/sq. foot Converter (hp (metric)/ft² to Btu/(s·ft²))

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Live Conversion • ISO 80000-5:2019 Certified
1 Metric horsepower/square foot = 0.69758444 BTU (th)/second/sq. foot
1 hp (metric)/ft² = 0.697584 Btu/(s·ft²) • 1 Btu/(s·ft²) = 1.433518 hp (metric)/ft²
Metric horsepower/square foot to BTU (th)/second/sq. foot: One Metric horsepower/square foot is equal to 0.69758444 Btus (th)/second/sq. foot.
Certified Authority Value
0.69758444
Btu/(s·ft²)
Exact: 1 Btu/(s·ft²) ≡ 1.4335182094 hp (metric)/ft²
hp (metric)/ft²
hp (metric)/ft²
Swap to BTU (th)/second/sq. foot to Metric horsepower/square foot
Swap to BTU (th)/second/sq. foot to Metric horsepower/square foot
Btu/(s·ft²)
Btu/(s·ft²) 0.69758444
Quick Values:
Conversion Formula
To convert Metric horsepower/square foot to BTU (th)/second/sq. foot, multiply by 0.69758444
hp (metric)/ft² × 0.69758444 = Btu/(s·ft²)

Calculation: 1 hp (metric)/ft² × 0.69758444 = 0.69758444 Btu/(s·ft²)

Common Metric horsepower/square foot to BTU (th)/second/sq. foot Calculations

Quick-lookup reference table showing calculated equivalents for standard increments between Metric horsepower/square foot (hp (metric)/ft²) and BTU (th)/second/sq. foot (Btu/(s·ft²)).

Tap any row to calculate
Metric horsepower/square foot to BTU (th)/second/sq. foot: Primary Direct Table (15 Steps)
Metric horsepower/square foot to BTU (th)/second/sq. foot Conversion Reference Table
Conversion & Equivalent Value Scientific Notation
0.001 hp (metric)/ft² 0.000697584 Btu/(s·ft²) 6.976 × 10⁻⁴
0.01 hp (metric)/ft² 0.00697584 Btu/(s·ft²) 6.976 × 10⁻³
0.1 hp (metric)/ft² 0.0697584 Btu/(s·ft²) 6.976 × 10⁻²
0.5 hp (metric)/ft² 0.348792 Btu/(s·ft²) 3.488 × 10⁻¹
1 hp (metric)/ft² 0.697584 Btu/(s·ft²) 6.976 × 10⁻¹
2 hp (metric)/ft² 1.395169 Btu/(s·ft²) 1.395 × 10⁰
5 hp (metric)/ft² 3.487922 Btu/(s·ft²) 3.488 × 10⁰
10 hp (metric)/ft² 6.975844 Btu/(s·ft²) 6.976 × 10⁰
20 hp (metric)/ft² 13.951689 Btu/(s·ft²) 1.395 × 10¹
25 hp (metric)/ft² 17.439611 Btu/(s·ft²) 1.744 × 10¹
50 hp (metric)/ft² 34.879222 Btu/(s·ft²) 3.488 × 10¹
100 hp (metric)/ft² 69.758444 Btu/(s·ft²) 6.976 × 10¹
250 hp (metric)/ft² 174.39611 Btu/(s·ft²) 1.744 × 10²
500 hp (metric)/ft² 348.792221 Btu/(s·ft²) 3.488 × 10²
1000 hp (metric)/ft² 697.584442 Btu/(s·ft²) 6.976 × 10²
BTU (th)/second/sq. foot to Metric horsepower/square foot: Reciprocal Summary
BTU (th)/second/sq. foot to Metric horsepower/square foot Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 Btu/(s·ft²) 1.433518 hp (metric)/ft² 1.434 × 10⁰
5 Btu/(s·ft²) 7.167591 hp (metric)/ft² 7.168 × 10⁰
10 Btu/(s·ft²) 14.335182 hp (metric)/ft² 1.434 × 10¹
50 Btu/(s·ft²) 71.67591 hp (metric)/ft² 7.168 × 10¹
100 Btu/(s·ft²) 143.351821 hp (metric)/ft² 1.434 × 10²
View Complete 15-Row BTU (th)/second/sq. foot to Metric horsepower/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 Metric horsepower/square foot (hp (metric)/ft²) and BTU (th)/second/sq. foot (Btu/(s·ft²)):

Metric horsepower/square foot References:

  • Solar constant extraterrestrial solar irradiance at top of atmosphere 0.171912 hp (metric)/ft²
  • Clear sky direct midday summer sunlight striking sea level ground 0.126313 hp (metric)/ft²
  • Human body resting thermal metabolic heat radiation to room 0.006316 hp (metric)/ft²
  • Overcast winter day diffuse solar irradiance at sea level 0.012631 hp (metric)/ft²

BTU (th)/second/sq. foot References:

  • Solar constant extraterrestrial solar irradiance at top of atmosphere 0.119923 Btu/(s·ft²)
  • Clear sky direct midday summer sunlight striking sea level ground 0.088114 Btu/(s·ft²)
  • Human body resting thermal metabolic heat radiation to room 0.004406 Btu/(s·ft²)
  • Overcast winter day diffuse solar irradiance at sea level 0.008811 Btu/(s·ft²)

Tap any benchmark above to automatically calculate its exact equivalent in BTU (th)/second/sq. foot.

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

How to Convert Metric horsepower/square foot to BTU (th)/second/sq. foot

Converting Metric horsepower/square foot (hp (metric)/ft²) to BTU (th)/second/sq. 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 Metric horsepower/square foot equals 0.697584 BTU (th)/second/sq. foot, while 1 Btu/(s·ft²) equals 1.433518 hp (metric)/ft².

Direct Factor1 hp (metric)/ft² = 0.697584 Btu/(s·ft²)
Inverse Ratio1 Btu/(s·ft²) = 1.433518 hp (metric)/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 hp (metric)/ft² = 7916.837 watt per square meter (W/m²)
2. Target SI Bridge (ktarget):1 Btu/(s·ft²) = 11348.93 watt per square meter (W/m²)
Step-by-step substitution for Metric horsepower/square foot → BTU (th)/second/sq. foot:V(Btu/(s·ft²)) = V(hp (metric)/ft²) × ( 7916.837 / 11348.93 ) = V(hp (metric)/ft²) × 0.697584
Mathematical FormulaValue in BTU (th)/second/sq. foot = Value in Metric horsepower/square foot × 0.69758444Direct computational formula applied for standard conversion.
Worked Example

For an engineering input of 36 hp (metric)/ft², applying the conversion factor yields exactly 25.11304 Btu/(s·ft²). At larger operational scale, 240 Metric horsepower/square foot corresponds to 167.420266 Btu/(s·ft²).

Inverse check: 1 Btu/(s·ft²) = 1.433518 hp (metric)/ft².

Understanding Metric horsepower/square foot and BTU (th)/second/sq. foot

Metric horsepower/square foot

hp (metric)/ft²
Imperial / US

A Metric horsepower/square foot (hp (metric)/ft²) is an imperial and US customary unit for heat flux density.

Applications & Practical Context

In practical heat flux density terms, a solar constant extraterrestrial solar irradiance at top of atmosphere equals 0.171912 hp (metric)/ft², a clear sky direct midday summer sunlight striking sea level ground equals 0.126313 hp (metric)/ft², a human body resting thermal metabolic heat radiation to room equals 0.006316 hp (metric)/ft².

Physical Setup

A physical magnitude of 1 hp (metric)/ft² corresponds to 7916.837 W/m² in standard SI measurement.

Conversion to SI Unit: watt per square meter (W/m²)
1 hp (metric)/ft² = 7916.837 W/m²

BTU (th)/second/sq. foot

Btu/(s·ft²)
Imperial / US

A BTU (th)/second/sq. 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 solar constant extraterrestrial solar irradiance at top of atmosphere equals 0.119923 Btu/(s·ft²), a clear sky direct midday summer sunlight striking sea level ground equals 0.088114 Btu/(s·ft²), a human body resting thermal metabolic heat radiation to room equals 0.004406 Btu/(s·ft²).

Physical Setup

A physical magnitude of 1 Btu/(s·ft²) corresponds to 11348.93 W/m² in standard SI measurement.

Conversion to SI Unit: watt per square meter (W/m²)
1 Btu/(s·ft²) = 11348.93 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 hp (metric)/ft² at Industrial Hydronic Radiator Panel (8 m²) = 63334.696 W
Equals 63.3347 kW • 0.0633347 MW • 84.9332 hp
SI Power
63334.696
W
Watts
Grid / Utility
63.3347
kW
Kilowatts
Power Plant
0.0633347
MW
Megawatts
Mechanical Rating
84.9332
hp
Horsepower (Mechanical)
Metric Horsepower
86.1112
PS
Metric Horsepower (PS)
HVAC Thermal Rating
216106.95
BTU/h
BTU per Hour
  1. 1. Normalize Input to SI Base Unit (W/m²):
    q" = 1 hp (metric)/ft² × 7916.837 = 7916.837 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 = (7916.837 W/m²) × (8 m²) = 63334.696 W
  4. 4. Convert to Standard Engineering Units:
    • W: 63334.696 × 1 = 63334.696 W (Watts) • kW: 63334.696 × 0.001 = 63.3347 kW (Kilowatts) • MW: 63334.696 × 1 × 10⁻⁶ = 0.0633347 MW (Megawatts) • hp: 63334.696 × 0.001341 = 84.9332 hp (Horsepower (Mechanical)) • PS: 63334.696 × 0.00136 = 86.1112 PS (Metric Horsepower (PS)) • BTU/h: 63334.696 × 3.4121 = 216106.95 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 0.69758444 btus (th)/second/sq. foot (Btu/(s·ft²)) in 1 metric horsepower/square foot (hp (metric)/ft²). To calculate larger amounts manually, simply multiply your total number of metric horsepowers/square foot by the conversion multiplier of 0.69758444.

The mathematical formula to convert metric horsepowers/square foot to btus (th)/second/sq. foot is: [value] * 0.69758444 = btus (th)/second/sq. 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 (th)/second/sq. foot back to metric horsepowers/square foot, you must divide your starting value by 0.69758444. Our bidirectional tool automatically computes this inverse equation the moment you type into the btu (th)/second/sq. foot input field.

1 BTU (th)/second/sq. foot is larger than 1 Metric horsepower/square foot. Specifically, 1 Metric horsepower/square foot equals 0.69758444 btus (th)/second/sq. foot, meaning 1 BTU (th)/second/sq. foot is 1.4335 times larger than 1 Metric horsepower/square foot (a difference of 0.16 orders of magnitude). Expressing measurements in metric horsepowers/square foot requires a larger numerical value to represent the equivalent physical magnitude.

Under standard international measurement guidelines, 1 Metric horsepower/square foot converts to 0.69758444 btus (th)/second/sq. foot. Precise numerical conversion factors ensure consistency across laboratory, engineering, and field data.