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Chus/hour/sq. foot/°C to Btus (th)/hour/sq. foot/°F Converter (CHU/(h·ft²·°C) to Btu (th)/(h·ft²·°F))

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Live Conversion • ISO 80000-5:2019 Certified
1 CHU/hour/sq. foot/°C = 1.00065308 BTU (th)/hour/sq. foot/°F
1 CHU/(h·ft²·°C) = 1.000653 Btu (th)/(h·ft²·°F) • 1 Btu (th)/(h·ft²·°F) = 0.999347 CHU/(h·ft²·°C)
CHU/hour/sq. foot/°C to BTU (th)/hour/sq. foot/°F: One CHU/hour/sq. foot/°C is equal to 1.00065308 Btus (th)/hour/sq. foot/°F.
Certified Authority Value
1.00065308
Btu (th)/(h·ft²·°F)
Exact: 1 Btu (th)/(h·ft²·°F) ≡ 0.9993473481 CHU/(h·ft²·°C)
CHU/(h·ft²·°C)
CHU/(h·ft²·°C)
Swap to BTU (th)/hour/sq. foot/°F to CHU/hour/sq. foot/°C
Swap to BTU (th)/hour/sq. foot/°F to CHU/hour/sq. foot/°C
Btu (th)/(h·ft²·°F)
Btu (th)/(h·ft²·°F) 1.00065308
Quick Values:
Conversion Formula
To convert CHU/hour/sq. foot/°C to BTU (th)/hour/sq. foot/°F, multiply by 1.00065308
CHU/(h·ft²·°C) × 1.00065308 = Btu (th)/(h·ft²·°F)

Calculation: 1 CHU/(h·ft²·°C) × 1.00065308 = 1.00065308 Btu (th)/(h·ft²·°F)

Common CHU/hour/sq. foot/°C to BTU (th)/hour/sq. foot/°F Calculations

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

Tap any row to calculate
CHU/hour/sq. foot/°C to BTU (th)/hour/sq. foot/°F: Primary Direct Table (15 Steps)
CHU/hour/sq. foot/°C to BTU (th)/hour/sq. foot/°F Conversion Reference Table
Conversion & Equivalent Value Scientific Notation
0.001 CHU/(h·ft²·°C) 0.00100065 Btu (th)/(h·ft²·°F) 1.001 × 10⁻³
0.01 CHU/(h·ft²·°C) 0.0100065 Btu (th)/(h·ft²·°F) 1.001 × 10⁻²
0.1 CHU/(h·ft²·°C) 0.100065 Btu (th)/(h·ft²·°F) 1.001 × 10⁻¹
0.5 CHU/(h·ft²·°C) 0.500327 Btu (th)/(h·ft²·°F) 5.003 × 10⁻¹
1 CHU/(h·ft²·°C) 1.000653 Btu (th)/(h·ft²·°F) 1.001 × 10⁰
2 CHU/(h·ft²·°C) 2.001306 Btu (th)/(h·ft²·°F) 2.001 × 10⁰
5 CHU/(h·ft²·°C) 5.003265 Btu (th)/(h·ft²·°F) 5.003 × 10⁰
10 CHU/(h·ft²·°C) 10.006531 Btu (th)/(h·ft²·°F) 1.001 × 10¹
20 CHU/(h·ft²·°C) 20.013062 Btu (th)/(h·ft²·°F) 2.001 × 10¹
25 CHU/(h·ft²·°C) 25.016327 Btu (th)/(h·ft²·°F) 2.502 × 10¹
50 CHU/(h·ft²·°C) 50.032654 Btu (th)/(h·ft²·°F) 5.003 × 10¹
100 CHU/(h·ft²·°C) 100.065308 Btu (th)/(h·ft²·°F) 1.001 × 10²
250 CHU/(h·ft²·°C) 250.16327 Btu (th)/(h·ft²·°F) 2.502 × 10²
500 CHU/(h·ft²·°C) 500.326539 Btu (th)/(h·ft²·°F) 5.003 × 10²
1000 CHU/(h·ft²·°C) 1000.653078 Btu (th)/(h·ft²·°F) 1.001 × 10³
BTU (th)/hour/sq. foot/°F to CHU/hour/sq. foot/°C: Reciprocal Summary
BTU (th)/hour/sq. foot/°F to CHU/hour/sq. foot/°C Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 Btu (th)/(h·ft²·°F) 0.999347 CHU/(h·ft²·°C) 9.993 × 10⁻¹
5 Btu (th)/(h·ft²·°F) 4.996737 CHU/(h·ft²·°C) 4.997 × 10⁰
10 Btu (th)/(h·ft²·°F) 9.993473 CHU/(h·ft²·°C) 9.993 × 10⁰
50 Btu (th)/(h·ft²·°F) 49.967367 CHU/(h·ft²·°C) 4.997 × 10¹
100 Btu (th)/(h·ft²·°F) 99.934735 CHU/(h·ft²·°C) 9.993 × 10¹
View Complete 15-Row BTU (th)/hour/sq. foot/°F to CHU/hour/sq. foot/°C 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/sq. foot/°C (CHU/(h·ft²·°C)) and BTU (th)/hour/sq. foot/°F (Btu (th)/(h·ft²·°F)):

CHU/hour/sq. foot/°C References:

  • Stationary ambient air natural free convection on vertical wall 0.880565 CHU/(h·ft²·°C)
  • Forced air breeze blowing across automotive cooling radiator 8.8057 CHU/(h·ft²·°C)
  • Liquid water forced circulation inside heat exchanger pipe 528.34 CHU/(h·ft²·°C)
  • Nucleate boiling heat transfer in pressurized steam boiler tube 2641.7 CHU/(h·ft²·°C)

BTU (th)/hour/sq. foot/°F References:

  • Stationary ambient air natural free convection on vertical wall 0.88114 Btu (th)/(h·ft²·°F)
  • Forced air breeze blowing across automotive cooling radiator 8.8114 Btu (th)/(h·ft²·°F)
  • Liquid water forced circulation inside heat exchanger pipe 528.68 Btu (th)/(h·ft²·°F)
  • Nucleate boiling heat transfer in pressurized steam boiler tube 2643.42 Btu (th)/(h·ft²·°F)

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

ISQ Dimension: [M T⁻³ Θ⁻¹] Coherent SI Unit: watt per square meter kelvin (W/(m²·K)) Thermodynamics & Heat Transfer

How to Convert CHU/hour/sq. foot/°C to BTU (th)/hour/sq. foot/°F

Converting CHU/hour/sq. foot/°C (CHU/(h·ft²·°C)) to BTU (th)/hour/sq. foot/°F (Btu (th)/(h·ft²·°F)) is a core calculation in Heat Transfer Coefficient, which quantifies the proportionality constant between the heat flux and the thermodynamic driving temperature difference. 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/sq. foot/°C equals 1.000653 BTU (th)/hour/sq. foot/°F, while 1 Btu (th)/(h·ft²·°F) equals 0.999347 CHU/(h·ft²·°C).

Direct Factor1 CHU/(h·ft²·°C) = 1.000653 Btu (th)/(h·ft²·°F)
Inverse Ratio1 Btu (th)/(h·ft²·°F) = 0.999347 CHU/(h·ft²·°C)
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 kelvin (W/(m²·K))) 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·°C) = 5.678173 watt per square meter kelvin (W/(m²·K))
2. Target SI Bridge (ktarget):1 Btu (th)/(h·ft²·°F) = 5.674467 watt per square meter kelvin (W/(m²·K))
Step-by-step substitution for CHU/hour/sq. foot/°C → BTU (th)/hour/sq. foot/°F:V(Btu (th)/(h·ft²·°F)) = V(CHU/(h·ft²·°C)) × ( 5.678173 / 5.674467 ) = V(CHU/(h·ft²·°C)) × 1.000653
Mathematical FormulaValue in BTU (th)/hour/sq. foot/°F = Value in CHU/hour/sq. foot/°C × 1.00065308Direct computational formula applied for standard conversion.
Worked Example

To convert 2.5 CHU/hour/sq. foot/°C (CHU/(h·ft²·°C)) to BTU (th)/hour/sq. foot/°F (Btu (th)/(h·ft²·°F)): multiply 2.5 by 1.000653 to get 2.501633 Btu (th)/(h·ft²·°F). At an industrial engineering scale, 1000 CHU/(h·ft²·°C) converts to 1000.653078 Btu (th)/(h·ft²·°F).

Inverse check: 1 Btu (th)/(h·ft²·°F) = 0.999347 CHU/(h·ft²·°C).

Understanding CHU/hour/sq. foot/°C and BTU (th)/hour/sq. foot/°F

CHU/hour/sq. foot/°C

CHU/(h·ft²·°C)
Imperial / US

A CHU/hour/sq. foot/°C (CHU/(h·ft²·°C)) is an imperial and US customary unit for heat transfer coefficient.

Applications & Practical Context

In practical heat transfer coefficient terms, a stationary ambient air natural free convection on vertical wall equals 0.880565 CHU/(h·ft²·°C), a forced air breeze blowing across automotive cooling radiator equals 8.8057 CHU/(h·ft²·°C), a liquid water forced circulation inside heat exchanger pipe equals 528.34 CHU/(h·ft²·°C).

Physical Setup

A physical magnitude of 1 CHU/(h·ft²·°C) corresponds to 5.678173 W/(m²·K) in standard SI measurement.

Conversion to SI Unit: watt per square meter kelvin (W/(m²·K))
1 CHU/(h·ft²·°C) = 5.678173 W/(m²·K)

BTU (th)/hour/sq. foot/°F

Btu (th)/(h·ft²·°F)
Imperial / US

A BTU (th)/hour/sq. foot/°F (Btu (th)/(h·ft²·°F)) is an imperial and US customary unit for heat transfer coefficient.

Applications & Practical Context

In practical heat transfer coefficient terms, a stationary ambient air natural free convection on vertical wall equals 0.88114 Btu (th)/(h·ft²·°F), a forced air breeze blowing across automotive cooling radiator equals 8.8114 Btu (th)/(h·ft²·°F), a liquid water forced circulation inside heat exchanger pipe equals 528.68 Btu (th)/(h·ft²·°F).

Physical Setup

A physical magnitude of 1 Btu (th)/(h·ft²·°F) corresponds to 5.674467 W/(m²·K) in standard SI measurement.

Conversion to SI Unit: watt per square meter kelvin (W/(m²·K))
1 Btu (th)/(h·ft²·°F) = 5.674467 W/(m²·K)

Domain Metrology & Engineering Applications

Governing Law & Equation

Newton's Law of Cooling (q = h · ΔT)

Measurement Instrumentation

Rigorously quantified in laboratory and field settings using surface heat flux transducer plates coupled with surface RTD arrays, and wind tunnel boundary layer calorimeters.

Primary Industry Sectors

Applied across industrial heat exchanger rating, nuclear reactor cooling loop simulation, electronics forced-air cooling, and architectural U-value certification under international metrology standard ISO 80000-5:2019, ASME PTC.

Institutional Metrology & Standard Authority:

Formulas, conversion coefficients, and base definitions on this page strictly adhere to the ISO 80000-5:2019, ASME PTC and the BIPM SI Brochure (9th Edition). Governed by Newton's Law of Cooling (q = h · ΔT) under ISO 80000 dimensional vector [M T⁻³ Θ⁻¹].

Multi-Variable Engineering Bridge Convective Thermodynamics & Cooling

Heat Transfer Coefficient to Convective Flux Bridge (W/m² • kW/m² • BTU/(h·ft²) • cal/(s·cm²))

Calculate Newton’s law of cooling convective heat flux q" = h × ΔT across convective film temperature drops, bridging heat transfer coefficient [M T⁻³ Θ⁻¹] with heat flux [M T⁻³].

q" = h × ΔT
Vector: [W/(m²·K)] × [K] → [W/m²]
Live Calculated Bridge Equivalent:
1 CHU/(h·ft²·°C) at Forced Air Duct Cooling (ΔT = 25 K) = 141.9543 W/m²
Equals 0.142 kW/m² • 44.9993 BTU/(h·ft²) • 0.00339052 cal/(s·cm²)
SI Heat Flux
141.9543
W/m²
Watts per Square Meter
Solar / Combustion
0.142
kW/m²
Kilowatts per Square Meter
US Building Envelope
44.9993
BTU/(h·ft²)
BTU per Hour Sq. Foot
CGS Thermal
0.00339052
cal/(s·cm²)
Calories per Second Sq. Cm
Meteorology
0.2035
Ly/min
Langley per Minute
Furnace Flux
0.00014195
MW/m²
Megawatts per Square Meter
  1. 1. Normalize Input to SI Base Unit (W/(m²·K)):
    h = 1 CHU/(h·ft²·°C) × 5.67817254 = 5.67817254 W/(m²·K)
  2. 2. Apply Engineering Parameter (ΔT):
    Selected condition: Forced Air Duct Cooling (ΔT = 25 K) at ΔT = 25 K
  3. 3. Execute Governing Physical Law in SI Units:
    q" = h × ΔT = (5.67817254 W/(m²·K)) × (25 K) = 141.954313 W/m²
  4. 4. Convert to Standard Engineering Units:
    • W/m²: 141.954313 × 1 = 141.9543 W/m² (Watts per Square Meter) • kW/m²: 141.954313 × 0.001 = 0.142 kW/m² (Kilowatts per Square Meter) • BTU/(h·ft²): 141.954313 × 0.317 = 44.9993 BTU/(h·ft²) (BTU per Hour Sq. Foot) • cal/(s·cm²): 141.954313 × 2.3885 × 10⁻⁵ = 0.00339052 cal/(s·cm²) (Calories per Second Sq. Cm) • Ly/min: 141.954313 × 0.001433 = 0.2035 Ly/min (Langley per Minute) • MW/m²: 141.954313 × 1 × 10⁻⁶ = 0.00014195 MW/m² (Megawatts per Square Meter)
Explore Full Heat Flux Density Converter →
Engineering Substance / Operating Standard Parameter Value (K) Reference State / Condition Typical Industrial & Engineering Application
Natural Air Convection (ΔT = 15 K) 15 ΔT = 15 K (15°C) Still room air room heating surface delta
Forced Air Duct Cooling (ΔT = 25 K) 25 ΔT = 25 K (25°C) Forced fan ventilation heatsink airflow
Forced Liquid Water Cooling (ΔT = 30 K) 30 ΔT = 30 K Pumped liquid cold plate or engine jacket
Nucleate Boiling Heat Transfer (ΔT = 50 K) 50 ΔT = 50 K Boiler evaporator tube wall boundary
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Frequently Asked Questions

There are exactly 1.00065308 btus (th)/hour/sq. foot/°f (Btu (th)/(h·ft²·°F)) in 1 chu/hour/sq. foot/°c (CHU/(h·ft²·°C)). To calculate larger amounts manually, simply multiply your total number of chus/hour/sq. foot/°c by the conversion multiplier of 1.00065308.

The mathematical formula to convert chus/hour/sq. foot/°c to btus (th)/hour/sq. foot/°f is: [value] * 1.00065308 = btus (th)/hour/sq. foot/°f. 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/sq. foot/°f back to chus/hour/sq. foot/°c, you must divide your starting value by 1.00065308. Our bidirectional tool automatically computes this inverse equation the moment you type into the btu (th)/hour/sq. foot/°f input field.

1 CHU/hour/sq. foot/°C is larger than 1 BTU (th)/hour/sq. foot/°F. Specifically, 1 CHU/hour/sq. foot/°C equals exactly 1.00065308 btus (th)/hour/sq. foot/°f, making it 1.0007 times larger (a difference of 0.00 orders of magnitude). Therefore, quantities expressed in btus (th)/hour/sq. foot/°f require a larger numerical value to represent the same physical amount.

Under standard international measurement guidelines, 1 CHU/hour/sq. foot/°C converts to 1.00065308 btus (th)/hour/sq. foot/°f. Precise numerical conversion factors ensure consistency across laboratory, engineering, and field data.