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

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Live Conversion • ISO 80000-5:2019 Certified
1 BTU (th)/hour/sq. foot/°F = 0.99934735 CHU/hour/sq. foot/°C
1 Btu (th)/(h·ft²·°F) = 0.999347 CHU/(h·ft²·°C) • 1 CHU/(h·ft²·°C) = 1.000653 Btu (th)/(h·ft²·°F)
BTU (th)/hour/sq. foot/°F to CHU/hour/sq. foot/°C: One BTU (th)/hour/sq. foot/°F is equal to 0.99934735 Chus/hour/sq. foot/°C.
Certified Authority Value
0.99934735
CHU/(h·ft²·°C)
Exact: 1 CHU/(h·ft²·°C) ≡ 1.0006530782 Btu (th)/(h·ft²·°F)
Btu (th)/(h·ft²·°F)
Btu (th)/(h·ft²·°F)
Swap to CHU/hour/sq. foot/°C to BTU (th)/hour/sq. foot/°F
Swap to CHU/hour/sq. foot/°C to BTU (th)/hour/sq. foot/°F
CHU/(h·ft²·°C)
CHU/(h·ft²·°C) 0.99934735
Quick Values:
Conversion Formula
To convert BTU (th)/hour/sq. foot/°F to CHU/hour/sq. foot/°C, multiply by 0.99934735
Btu (th)/(h·ft²·°F) × 0.99934735 = CHU/(h·ft²·°C)

Calculation: 1 Btu (th)/(h·ft²·°F) × 0.99934735 = 0.99934735 CHU/(h·ft²·°C)

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

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

Tap any row to calculate
BTU (th)/hour/sq. foot/°F to CHU/hour/sq. foot/°C: Primary Direct Table (15 Steps)
BTU (th)/hour/sq. foot/°F to CHU/hour/sq. foot/°C Conversion Reference Table
Conversion & Equivalent Value Scientific Notation
0.001 Btu (th)/(h·ft²·°F) 0.000999347 CHU/(h·ft²·°C) 9.993 × 10⁻⁴
0.01 Btu (th)/(h·ft²·°F) 0.00999347 CHU/(h·ft²·°C) 9.993 × 10⁻³
0.1 Btu (th)/(h·ft²·°F) 0.0999347 CHU/(h·ft²·°C) 9.993 × 10⁻²
0.5 Btu (th)/(h·ft²·°F) 0.499674 CHU/(h·ft²·°C) 4.997 × 10⁻¹
1 Btu (th)/(h·ft²·°F) 0.999347 CHU/(h·ft²·°C) 9.993 × 10⁻¹
2 Btu (th)/(h·ft²·°F) 1.998695 CHU/(h·ft²·°C) 1.999 × 10⁰
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
20 Btu (th)/(h·ft²·°F) 19.986947 CHU/(h·ft²·°C) 1.999 × 10¹
25 Btu (th)/(h·ft²·°F) 24.983684 CHU/(h·ft²·°C) 2.498 × 10¹
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
250 Btu (th)/(h·ft²·°F) 249.836837 CHU/(h·ft²·°C) 2.498 × 10²
500 Btu (th)/(h·ft²·°F) 499.673674 CHU/(h·ft²·°C) 4.997 × 10²
1000 Btu (th)/(h·ft²·°F) 999.347348 CHU/(h·ft²·°C) 9.993 × 10²
CHU/hour/sq. foot/°C to BTU (th)/hour/sq. foot/°F: Reciprocal Summary
CHU/hour/sq. foot/°C to BTU (th)/hour/sq. foot/°F Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 CHU/(h·ft²·°C) 1.000653 Btu (th)/(h·ft²·°F) 1.001 × 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
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
View Complete 15-Row CHU/hour/sq. foot/°C to BTU (th)/hour/sq. foot/°F 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 (th)/hour/sq. foot/°F (Btu (th)/(h·ft²·°F)) and CHU/hour/sq. foot/°C (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)

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)

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

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

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

Converting BTU (th)/hour/sq. foot/°F (Btu (th)/(h·ft²·°F)) to CHU/hour/sq. foot/°C (CHU/(h·ft²·°C)) 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 BTU (th)/hour/sq. foot/°F equals 0.999347 CHU/hour/sq. foot/°C, while 1 CHU/(h·ft²·°C) equals 1.000653 Btu (th)/(h·ft²·°F).

Direct Factor1 Btu (th)/(h·ft²·°F) = 0.999347 CHU/(h·ft²·°C)
Inverse Ratio1 CHU/(h·ft²·°C) = 1.000653 Btu (th)/(h·ft²·°F)
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 Btu (th)/(h·ft²·°F) = 5.674467 watt per square meter kelvin (W/(m²·K))
2. Target SI Bridge (ktarget):1 CHU/(h·ft²·°C) = 5.678173 watt per square meter kelvin (W/(m²·K))
Step-by-step substitution for BTU (th)/hour/sq. foot/°F → CHU/hour/sq. foot/°C:V(CHU/(h·ft²·°C)) = V(Btu (th)/(h·ft²·°F)) × ( 5.674467 / 5.678173 ) = V(Btu (th)/(h·ft²·°F)) × 0.999347
Mathematical FormulaValue in CHU/hour/sq. foot/°C = Value in BTU (th)/hour/sq. foot/°F × 0.99934735Direct computational formula applied for standard conversion.
Worked Example

To convert 120 BTU (th)/hour/sq. foot/°F (Btu (th)/(h·ft²·°F)) to CHU/hour/sq. foot/°C (CHU/(h·ft²·°C)): multiply 120 by 0.999347 to get 119.921682 CHU/(h·ft²·°C). At an industrial engineering scale, 480 Btu (th)/(h·ft²·°F) converts to 479.686727 CHU/(h·ft²·°C).

Inverse check: 1 CHU/(h·ft²·°C) = 1.000653 Btu (th)/(h·ft²·°F).

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

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)

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)

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 Btu (th)/(h·ft²·°F) at Forced Air Duct Cooling (ΔT = 25 K) = 141.8617 W/m²
Equals 0.1419 kW/m² • 44.9699 BTU/(h·ft²) • 0.00338831 cal/(s·cm²)
SI Heat Flux
141.8617
W/m²
Watts per Square Meter
Solar / Combustion
0.1419
kW/m²
Kilowatts per Square Meter
US Building Envelope
44.9699
BTU/(h·ft²)
BTU per Hour Sq. Foot
CGS Thermal
0.00338831
cal/(s·cm²)
Calories per Second Sq. Cm
Meteorology
0.2033
Ly/min
Langley per Minute
Furnace Flux
0.00014186
MW/m²
Megawatts per Square Meter
  1. 1. Normalize Input to SI Base Unit (W/(m²·K)):
    h = 1 Btu (th)/(h·ft²·°F) × 5.67446667 = 5.67446667 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 = (5.67446667 W/(m²·K)) × (25 K) = 141.861667 W/m²
  4. 4. Convert to Standard Engineering Units:
    • W/m²: 141.861667 × 1 = 141.8617 W/m² (Watts per Square Meter) • kW/m²: 141.861667 × 0.001 = 0.1419 kW/m² (Kilowatts per Square Meter) • BTU/(h·ft²): 141.861667 × 0.317 = 44.9699 BTU/(h·ft²) (BTU per Hour Sq. Foot) • cal/(s·cm²): 141.861667 × 2.3885 × 10⁻⁵ = 0.00338831 cal/(s·cm²) (Calories per Second Sq. Cm) • Ly/min: 141.861667 × 0.001433 = 0.2033 Ly/min (Langley per Minute) • MW/m²: 141.861667 × 1 × 10⁻⁶ = 0.00014186 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 0.99934735 chus/hour/sq. foot/°c (CHU/(h·ft²·°C)) in 1 btu (th)/hour/sq. foot/°f (Btu (th)/(h·ft²·°F)). To calculate larger amounts manually, simply multiply your total number of btus (th)/hour/sq. foot/°f by the conversion multiplier of 0.99934735.

The mathematical formula to convert btus (th)/hour/sq. foot/°f to chus/hour/sq. foot/°c is: [value] * 0.99934735 = chus/hour/sq. foot/°c. 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/sq. foot/°c back to btus (th)/hour/sq. foot/°f, you must divide your starting value by 0.99934735. Our bidirectional tool automatically computes this inverse equation the moment you type into the chu/hour/sq. foot/°c input field.

1 CHU/hour/sq. foot/°C is larger than 1 BTU (th)/hour/sq. foot/°F. Specifically, 1 BTU (th)/hour/sq. foot/°F equals 0.99934735 chus/hour/sq. foot/°c, meaning 1 CHU/hour/sq. foot/°C is 1.0007 times larger than 1 BTU (th)/hour/sq. foot/°F (a difference of 0.00 orders of magnitude). Expressing measurements in btus (th)/hour/sq. foot/°f requires a larger numerical value to represent the equivalent physical magnitude.

Under standard international measurement guidelines, 1 BTU (th)/hour/sq. foot/°F converts to 0.99934735 chus/hour/sq. foot/°c. Precise numerical conversion factors ensure consistency across laboratory, engineering, and field data.