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

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Live Conversion • ISO 80000-5:2019 Certified
1 Btu (IT)/hour/square foot = 0.55555498 CHU/hour/square foot
1 Btu/(h·ft²) = 0.555555 CHU/(h·ft²) • 1 CHU/(h·ft²) = 1.800002 Btu/(h·ft²)
Btu (IT)/hour/square foot to CHU/hour/square foot: One Btu (IT)/hour/square foot is equal to 0.55555498 Chus/hour/square foot.
Certified Authority Value
0.55555498
CHU/(h·ft²)
Exact: 1 CHU/(h·ft²) ≡ 1.8000018774 Btu/(h·ft²)
Btu/(h·ft²)
Btu/(h·ft²)
Swap to CHU/hour/square foot to Btu (IT)/hour/square foot
Swap to CHU/hour/square foot to Btu (IT)/hour/square foot
CHU/(h·ft²)
CHU/(h·ft²) 0.55555498
Quick Values:
Conversion Formula
To convert Btu (IT)/hour/square foot to CHU/hour/square foot, multiply by 0.55555498
Btu/(h·ft²) × 0.55555498 = CHU/(h·ft²)

Calculation: 1 Btu/(h·ft²) × 0.55555498 = 0.55555498 CHU/(h·ft²)

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

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

Tap any row to calculate
Btu (IT)/hour/square foot to CHU/hour/square foot: Primary Direct Table (15 Steps)
Btu (IT)/hour/square foot to CHU/hour/square foot Conversion Reference Table
Conversion & Equivalent Value Scientific Notation
0.001 Btu/(h·ft²) 0.000555555 CHU/(h·ft²) 5.556 × 10⁻⁴
0.01 Btu/(h·ft²) 0.00555555 CHU/(h·ft²) 5.556 × 10⁻³
0.1 Btu/(h·ft²) 0.0555555 CHU/(h·ft²) 5.556 × 10⁻²
0.5 Btu/(h·ft²) 0.277777 CHU/(h·ft²) 2.778 × 10⁻¹
1 Btu/(h·ft²) 0.555555 CHU/(h·ft²) 5.556 × 10⁻¹
2 Btu/(h·ft²) 1.11111 CHU/(h·ft²) 1.111 × 10⁰
5 Btu/(h·ft²) 2.777775 CHU/(h·ft²) 2.778 × 10⁰
10 Btu/(h·ft²) 5.55555 CHU/(h·ft²) 5.556 × 10⁰
20 Btu/(h·ft²) 11.1111 CHU/(h·ft²) 1.111 × 10¹
25 Btu/(h·ft²) 13.888874 CHU/(h·ft²) 1.389 × 10¹
50 Btu/(h·ft²) 27.777749 CHU/(h·ft²) 2.778 × 10¹
100 Btu/(h·ft²) 55.555498 CHU/(h·ft²) 5.556 × 10¹
250 Btu/(h·ft²) 138.888744 CHU/(h·ft²) 1.389 × 10²
500 Btu/(h·ft²) 277.777488 CHU/(h·ft²) 2.778 × 10²
1000 Btu/(h·ft²) 555.554976 CHU/(h·ft²) 5.556 × 10²
CHU/hour/square foot to Btu (IT)/hour/square foot: Reciprocal Summary
CHU/hour/square foot to Btu (IT)/hour/square foot Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 CHU/(h·ft²) 1.800002 Btu/(h·ft²) 1.8 × 10⁰
5 CHU/(h·ft²) 9.000009 Btu/(h·ft²) 9 × 10⁰
10 CHU/(h·ft²) 18.000019 Btu/(h·ft²) 1.8 × 10¹
50 CHU/(h·ft²) 90.000094 Btu/(h·ft²) 9 × 10¹
100 CHU/(h·ft²) 180.000188 Btu/(h·ft²) 1.8 × 10²
View Complete 15-Row CHU/hour/square foot to Btu (IT)/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 Btu (IT)/hour/square foot (Btu/(h·ft²)) and CHU/hour/square foot (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)

CHU/hour/square foot References:

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

Tap any benchmark above to automatically calculate its exact equivalent in CHU/hour/square foot.

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

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

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

Direct Factor1 Btu/(h·ft²) = 0.555555 CHU/(h·ft²)
Inverse Ratio1 CHU/(h·ft²) = 1.800002 Btu/(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 Btu/(h·ft²) = 3.154591 watt per square meter (W/m²)
2. Target SI Bridge (ktarget):1 CHU/(h·ft²) = 5.678269 watt per square meter (W/m²)
Step-by-step substitution for Btu (IT)/hour/square foot → CHU/hour/square foot:V(CHU/(h·ft²)) = V(Btu/(h·ft²)) × ( 3.154591 / 5.678269 ) = V(Btu/(h·ft²)) × 0.555555
Mathematical FormulaValue in CHU/hour/square foot = Value in Btu (IT)/hour/square foot × 0.55555498Direct computational formula applied for standard conversion.
Worked Example

Evaluating an input of 24 Btu (IT)/hour/square foot (Btu/(h·ft²)) produces 13.333319 CHU/hour/square foot (CHU/(h·ft²)). In heavy-duty utility and industrial workloads, 480 Btu/(h·ft²) equals 266.666389 CHU/(h·ft²).

Inverse check: 1 CHU/(h·ft²) = 1.800002 Btu/(h·ft²).

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

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

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

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 Btu/(h·ft²) at Industrial Hydronic Radiator Panel (8 m²) = 25.2367 W
Equals 0.02524 kW • 2.523673 × 10⁻⁵ MW • 0.03384 hp
SI Power
25.2367
W
Watts
Grid / Utility
0.02524
kW
Kilowatts
Power Plant
2.523673 × 10⁻⁵
MW
Megawatts
Mechanical Rating
0.03384
hp
Horsepower (Mechanical)
Metric Horsepower
0.03431
PS
Metric Horsepower (PS)
HVAC Thermal Rating
86.11
BTU/h
BTU per Hour
  1. 1. Normalize Input to SI Base Unit (W/m²):
    q" = 1 Btu/(h·ft²) × 3.15459075 = 3.15459075 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 = (3.15459075 W/m²) × (8 m²) = 25.236726 W
  4. 4. Convert to Standard Engineering Units:
    • W: 25.236726 × 1 = 25.2367 W (Watts) • kW: 25.236726 × 0.001 = 0.02524 kW (Kilowatts) • MW: 25.236726 × 1 × 10⁻⁶ = 2.523673 × 10⁻⁵ MW (Megawatts) • hp: 25.236726 × 0.001341 = 0.03384 hp (Horsepower (Mechanical)) • PS: 25.236726 × 0.00136 = 0.03431 PS (Metric Horsepower (PS)) • BTU/h: 25.236726 × 3.4121 = 86.11 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 0.55555498 chus/hour/square foot (CHU/(h·ft²)) in 1 btu (it)/hour/square foot (Btu/(h·ft²)). To calculate larger amounts manually, simply multiply your total number of btus (it)/hour/square foot by the conversion multiplier of 0.55555498.

The mathematical formula to convert btus (it)/hour/square foot to chus/hour/square foot is: [value] * 0.55555498 = chus/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 chus/hour/square foot back to btus (it)/hour/square foot, you must divide your starting value by 0.55555498. Our bidirectional tool automatically computes this inverse equation the moment you type into the chu/hour/square foot input field.

1 CHU/hour/square foot is larger than 1 Btu (IT)/hour/square foot. Specifically, 1 Btu (IT)/hour/square foot equals 0.55555498 chus/hour/square foot, meaning 1 CHU/hour/square foot is 1.8 times larger than 1 Btu (IT)/hour/square foot (a difference of 0.26 orders of magnitude). Expressing measurements in btus (it)/hour/square foot requires a larger numerical value to represent the equivalent physical magnitude.

Under standard international measurement guidelines, 1 Btu (IT)/hour/square foot converts to 0.55555498 chus/hour/square foot. Precise numerical conversion factors ensure consistency across laboratory, engineering, and field data.