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Chus/hour/square foot to Btus (IT)/hour/square foot Converter (CHU/(h·ft²) to Btu/(h·ft²))

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Live Conversion • ISO 80000-5:2019 Certified
1 CHU/hour/square foot = 1.80000188 Btu (IT)/hour/square foot
1 CHU/(h·ft²) = 1.800002 Btu/(h·ft²) • 1 Btu/(h·ft²) = 0.555555 CHU/(h·ft²)
CHU/hour/square foot to Btu (IT)/hour/square foot: One CHU/hour/square foot is equal to 1.80000188 Btus (IT)/hour/square foot.
Certified Authority Value
1.80000188
Btu/(h·ft²)
Exact: 1 Btu/(h·ft²) ≡ 0.5555549761 CHU/(h·ft²)
CHU/(h·ft²)
CHU/(h·ft²)
Swap to Btu (IT)/hour/square foot to CHU/hour/square foot
Swap to Btu (IT)/hour/square foot to CHU/hour/square foot
Btu/(h·ft²)
Btu/(h·ft²) 1.80000188
Quick Values:
Conversion Formula
To convert CHU/hour/square foot to Btu (IT)/hour/square foot, multiply by 1.80000188
CHU/(h·ft²) × 1.80000188 = Btu/(h·ft²)

Calculation: 1 CHU/(h·ft²) × 1.80000188 = 1.80000188 Btu/(h·ft²)

Common CHU/hour/square foot to Btu (IT)/hour/square foot Calculations

Quick-lookup reference table showing calculated equivalents for standard increments between CHU/hour/square foot (CHU/(h·ft²)) and Btu (IT)/hour/square foot (Btu/(h·ft²)).

Tap any row to calculate
CHU/hour/square foot to Btu (IT)/hour/square foot: Primary Direct Table (15 Steps)
CHU/hour/square foot to Btu (IT)/hour/square foot Conversion Reference Table
Conversion & Equivalent Value Scientific Notation
0.001 CHU/(h·ft²) 0.0018 Btu/(h·ft²) 1.8 × 10⁻³
0.01 CHU/(h·ft²) 0.018 Btu/(h·ft²) 1.8 × 10⁻²
0.1 CHU/(h·ft²) 0.18 Btu/(h·ft²) 1.8 × 10⁻¹
0.5 CHU/(h·ft²) 0.900001 Btu/(h·ft²) 9 × 10⁻¹
1 CHU/(h·ft²) 1.800002 Btu/(h·ft²) 1.8 × 10⁰
2 CHU/(h·ft²) 3.600004 Btu/(h·ft²) 3.6 × 10⁰
5 CHU/(h·ft²) 9.000009 Btu/(h·ft²) 9 × 10⁰
10 CHU/(h·ft²) 18.000019 Btu/(h·ft²) 1.8 × 10¹
20 CHU/(h·ft²) 36.000038 Btu/(h·ft²) 3.6 × 10¹
25 CHU/(h·ft²) 45.000047 Btu/(h·ft²) 4.5 × 10¹
50 CHU/(h·ft²) 90.000094 Btu/(h·ft²) 9 × 10¹
100 CHU/(h·ft²) 180.000188 Btu/(h·ft²) 1.8 × 10²
250 CHU/(h·ft²) 450.000469 Btu/(h·ft²) 4.5 × 10²
500 CHU/(h·ft²) 900.000939 Btu/(h·ft²) 9 × 10²
1000 CHU/(h·ft²) 1800.001877 Btu/(h·ft²) 1.8 × 10³
Btu (IT)/hour/square foot to CHU/hour/square foot: Reciprocal Summary
Btu (IT)/hour/square foot to CHU/hour/square foot Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 Btu/(h·ft²) 0.555555 CHU/(h·ft²) 5.556 × 10⁻¹
5 Btu/(h·ft²) 2.777775 CHU/(h·ft²) 2.778 × 10⁰
10 Btu/(h·ft²) 5.55555 CHU/(h·ft²) 5.556 × 10⁰
50 Btu/(h·ft²) 27.777749 CHU/(h·ft²) 2.778 × 10¹
100 Btu/(h·ft²) 55.555498 CHU/(h·ft²) 5.556 × 10¹
View Complete 15-Row Btu (IT)/hour/square foot to CHU/hour/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 CHU/hour/square foot (CHU/(h·ft²)) and Btu (IT)/hour/square foot (Btu/(h·ft²)):

CHU/hour/square foot References:

  • British historical boiler combustion heat transfer flux 150 CHU/(h·ft²)

Btu (IT)/hour/square foot References:

  • Direct summer sunshine striking asphalt shingle roof surface 300 Btu/(h·ft²)
  • Residential cast iron steam heating radiator surface heat flux 240 Btu/(h·ft²)

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

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

How to Convert CHU/hour/square foot to Btu (IT)/hour/square foot

Converting CHU/hour/square foot (CHU/(h·ft²)) to Btu (IT)/hour/square foot (Btu/(h·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 CHU/hour/square foot equals 1.800002 Btu (IT)/hour/square foot, while 1 Btu/(h·ft²) equals 0.555555 CHU/(h·ft²).

Direct Factor1 CHU/(h·ft²) = 1.800002 Btu/(h·ft²)
Inverse Ratio1 Btu/(h·ft²) = 0.555555 CHU/(h·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 CHU/(h·ft²) = 5.678269 watt per square meter (W/m²)
2. Target SI Bridge (ktarget):1 Btu/(h·ft²) = 3.154591 watt per square meter (W/m²)
Step-by-step substitution for CHU/hour/square foot → Btu (IT)/hour/square foot:V(Btu/(h·ft²)) = V(CHU/(h·ft²)) × ( 5.678269 / 3.154591 ) = V(CHU/(h·ft²)) × 1.800002
Mathematical FormulaValue in Btu (IT)/hour/square foot = Value in CHU/hour/square foot × 1.80000188Direct computational formula applied for standard conversion.
Worked Example

For an engineering input of 15 CHU/(h·ft²), applying the conversion factor yields exactly 27.000028 Btu/(h·ft²). At larger operational scale, 480 CHU/hour/square foot corresponds to 864.000901 Btu/(h·ft²).

Inverse check: 1 Btu/(h·ft²) = 0.555555 CHU/(h·ft²).

Understanding CHU/hour/square foot and Btu (IT)/hour/square foot

CHU/hour/square foot

CHU/(h·ft²)
Imperial / US

A CHU/hour/square foot (CHU/(h·ft²)) is an imperial and US customary unit for heat flux density.

Applications & Practical Context

In practical heat flux density terms, a British historical boiler combustion heat transfer flux equals 150 CHU/(h·ft²).

Physical Setup

A physical magnitude of 1 CHU/(h·ft²) corresponds to 5.678269 W/m² in standard SI measurement.

Conversion to SI Unit: watt per square meter (W/m²)
1 CHU/(h·ft²) = 5.678269 W/m²

Btu (IT)/hour/square foot

Btu/(h·ft²)
Imperial / US

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

Applications & Practical Context

In practical heat flux density terms, a direct summer sunshine striking asphalt shingle roof surface equals 300 Btu/(h·ft²), a residential cast iron steam heating radiator surface heat flux equals 240 Btu/(h·ft²).

Physical Setup

A physical magnitude of 1 Btu/(h·ft²) corresponds to 3.154591 W/m² in standard SI measurement.

Conversion to SI Unit: watt per square meter (W/m²)
1 Btu/(h·ft²) = 3.154591 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 CHU/(h·ft²) at Industrial Hydronic Radiator Panel (8 m²) = 45.4262 W
Equals 0.04543 kW • 4.542615 × 10⁻⁵ MW • 0.06092 hp
SI Power
45.4262
W
Watts
Grid / Utility
0.04543
kW
Kilowatts
Power Plant
4.542615 × 10⁻⁵
MW
Megawatts
Mechanical Rating
0.06092
hp
Horsepower (Mechanical)
Metric Horsepower
0.06176
PS
Metric Horsepower (PS)
HVAC Thermal Rating
155
BTU/h
BTU per Hour
  1. 1. Normalize Input to SI Base Unit (W/m²):
    q" = 1 CHU/(h·ft²) × 5.67826926 = 5.67826926 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 = (5.67826926 W/m²) × (8 m²) = 45.426154 W
  4. 4. Convert to Standard Engineering Units:
    • W: 45.426154 × 1 = 45.4262 W (Watts) • kW: 45.426154 × 0.001 = 0.04543 kW (Kilowatts) • MW: 45.426154 × 1 × 10⁻⁶ = 4.542615 × 10⁻⁵ MW (Megawatts) • hp: 45.426154 × 0.001341 = 0.06092 hp (Horsepower (Mechanical)) • PS: 45.426154 × 0.00136 = 0.06176 PS (Metric Horsepower (PS)) • BTU/h: 45.426154 × 3.4121 = 155 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 1.80000188 btus (it)/hour/square foot (Btu/(h·ft²)) in 1 chu/hour/square foot (CHU/(h·ft²)). To calculate larger amounts manually, simply multiply your total number of chus/hour/square foot by the conversion multiplier of 1.80000188.

The mathematical formula to convert chus/hour/square foot to btus (it)/hour/square foot is: [value] * 1.80000188 = btus (it)/hour/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)/hour/square foot back to chus/hour/square foot, you must divide your starting value by 1.80000188. Our bidirectional tool automatically computes this inverse equation the moment you type into the btu (it)/hour/square foot input field.

1 CHU/hour/square foot is larger than 1 Btu (IT)/hour/square foot. Specifically, 1 CHU/hour/square foot equals exactly 1.80000188 btus (it)/hour/square foot, making it 1.8 times larger (a difference of 0.26 orders of magnitude). Therefore, quantities expressed in btus (it)/hour/square foot require a larger numerical value to represent the same physical amount.

Under standard international measurement guidelines, 1 CHU/hour/square foot converts to 1.80000188 btus (it)/hour/square foot. Precise numerical conversion factors ensure consistency across laboratory, engineering, and field data.