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

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Live Conversion • ISO 80000-5:2019 Certified
1 CHU/hour/square foot = 1.80120647 Btu (th)/hour/square foot
1 CHU/(h·ft²) = 1.801206 Btu (th)/(h·ft²) • 1 Btu (th)/(h·ft²) = 0.555183 CHU/(h·ft²)
CHU/hour/square foot to Btu (th)/hour/square foot: One CHU/hour/square foot is equal to 1.80120647 Btus (th)/hour/square foot.
Certified Authority Value
1.80120647
Btu (th)/(h·ft²)
Exact: 1 Btu (th)/(h·ft²) ≡ 0.5551834384 CHU/(h·ft²)
CHU/(h·ft²)
CHU/(h·ft²)
Swap to Btu (th)/hour/square foot to CHU/hour/square foot
Swap to Btu (th)/hour/square foot to CHU/hour/square foot
Btu (th)/(h·ft²)
Btu (th)/(h·ft²) 1.80120647
Quick Values:
Conversion Formula
To convert CHU/hour/square foot to Btu (th)/hour/square foot, multiply by 1.80120647
CHU/(h·ft²) × 1.80120647 = Btu (th)/(h·ft²)

Calculation: 1 CHU/(h·ft²) × 1.80120647 = 1.80120647 Btu (th)/(h·ft²)

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

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

Tap any row to calculate
CHU/hour/square foot to Btu (th)/hour/square foot: Primary Direct Table (15 Steps)
CHU/hour/square foot to Btu (th)/hour/square foot Conversion Reference Table
Conversion & Equivalent Value Scientific Notation
0.001 CHU/(h·ft²) 0.00180121 Btu (th)/(h·ft²) 1.801 × 10⁻³
0.01 CHU/(h·ft²) 0.0180121 Btu (th)/(h·ft²) 1.801 × 10⁻²
0.1 CHU/(h·ft²) 0.180121 Btu (th)/(h·ft²) 1.801 × 10⁻¹
0.5 CHU/(h·ft²) 0.900603 Btu (th)/(h·ft²) 9.006 × 10⁻¹
1 CHU/(h·ft²) 1.801206 Btu (th)/(h·ft²) 1.801 × 10⁰
2 CHU/(h·ft²) 3.602413 Btu (th)/(h·ft²) 3.602 × 10⁰
5 CHU/(h·ft²) 9.006032 Btu (th)/(h·ft²) 9.006 × 10⁰
10 CHU/(h·ft²) 18.012065 Btu (th)/(h·ft²) 1.801 × 10¹
20 CHU/(h·ft²) 36.024129 Btu (th)/(h·ft²) 3.602 × 10¹
25 CHU/(h·ft²) 45.030162 Btu (th)/(h·ft²) 4.503 × 10¹
50 CHU/(h·ft²) 90.060323 Btu (th)/(h·ft²) 9.006 × 10¹
100 CHU/(h·ft²) 180.120647 Btu (th)/(h·ft²) 1.801 × 10²
250 CHU/(h·ft²) 450.301617 Btu (th)/(h·ft²) 4.503 × 10²
500 CHU/(h·ft²) 900.603234 Btu (th)/(h·ft²) 9.006 × 10²
1000 CHU/(h·ft²) 1801.206468 Btu (th)/(h·ft²) 1.801 × 10³
Btu (th)/hour/square foot to CHU/hour/square foot: Reciprocal Summary
Btu (th)/hour/square foot to CHU/hour/square foot Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 Btu (th)/(h·ft²) 0.555183 CHU/(h·ft²) 5.552 × 10⁻¹
5 Btu (th)/(h·ft²) 2.775917 CHU/(h·ft²) 2.776 × 10⁰
10 Btu (th)/(h·ft²) 5.551834 CHU/(h·ft²) 5.552 × 10⁰
50 Btu (th)/(h·ft²) 27.759172 CHU/(h·ft²) 2.776 × 10¹
100 Btu (th)/(h·ft²) 55.518344 CHU/(h·ft²) 5.552 × 10¹
View Complete 15-Row Btu (th)/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 (th)/hour/square foot (Btu (th)/(h·ft²)):

CHU/hour/square foot References:

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

Btu (th)/hour/square foot References:

  • Commercial greenhouse thermal glass wall solar heat gain 180 Btu (th)/(h·ft²)

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

Converting CHU/hour/square foot (CHU/(h·ft²)) to Btu (th)/hour/square foot (Btu (th)/(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 1.801206 Btu (th)/hour/square foot, while 1 Btu (th)/(h·ft²) equals 0.555183 CHU/(h·ft²).

Direct Factor1 CHU/(h·ft²) = 1.801206 Btu (th)/(h·ft²)
Inverse Ratio1 Btu (th)/(h·ft²) = 0.555183 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 (th)/(h·ft²) = 3.152481 watt per square meter (W/m²)
Step-by-step substitution for CHU/hour/square foot → Btu (th)/hour/square foot:V(Btu (th)/(h·ft²)) = V(CHU/(h·ft²)) × ( 5.678269 / 3.152481 ) = V(CHU/(h·ft²)) × 1.801206
Mathematical FormulaValue in Btu (th)/hour/square foot = Value in CHU/hour/square foot × 1.80120647Direct computational formula applied for standard conversion.
Worked Example

For an engineering input of 8 CHU/(h·ft²), applying the conversion factor yields exactly 14.409652 Btu (th)/(h·ft²). At larger operational scale, 1000 CHU/hour/square foot corresponds to 1801.206468 Btu (th)/(h·ft²).

Inverse check: 1 Btu (th)/(h·ft²) = 0.555183 CHU/(h·ft²).

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

Btu (th)/(h·ft²)
Imperial / US

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

Applications & Practical Context

In practical heat flux density terms, a commercial greenhouse thermal glass wall solar heat gain equals 180 Btu (th)/(h·ft²).

Physical Setup

A physical magnitude of 1 Btu (th)/(h·ft²) corresponds to 3.152481 W/m² in standard SI measurement.

Conversion to SI Unit: watt per square meter (W/m²)
1 Btu (th)/(h·ft²) = 3.152481 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 1.80120647 btus (th)/hour/square foot (Btu (th)/(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 1.80120647.

The mathematical formula to convert chus/hour/square foot to btus (th)/hour/square foot is: [value] * 1.80120647 = btus (th)/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 (th)/hour/square foot back to chus/hour/square foot, you must divide your starting value by 1.80120647. Our bidirectional tool automatically computes this inverse equation the moment you type into the btu (th)/hour/square foot input field.

1 CHU/hour/square foot is larger than 1 Btu (th)/hour/square foot. Specifically, 1 CHU/hour/square foot equals exactly 1.80120647 btus (th)/hour/square foot, making it 1.8012 times larger (a difference of 0.26 orders of magnitude). Therefore, quantities expressed in btus (th)/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 1.80120647 btus (th)/hour/square foot. Precise numerical conversion factors ensure consistency across laboratory, engineering, and field data.