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

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Live Conversion • ISO 80000-5:2019 Certified
1 BTU (IT)/hour/sq. foot/°F = 1.00001599 CHU/hour/sq. foot/°C
1 Btu/(h·ft²·°F) = 1.000016 CHU/(h·ft²·°C) • 1 CHU/(h·ft²·°C) = 0.999984 Btu/(h·ft²·°F)
BTU (IT)/hour/sq. foot/°F to CHU/hour/sq. foot/°C: One BTU (IT)/hour/sq. foot/°F is equal to 1.00001599 Chus/hour/sq. foot/°C.
Certified Authority Value
1.00001599
CHU/(h·ft²·°C)
Exact: 1 CHU/(h·ft²·°C) ≡ 0.9999840098 Btu/(h·ft²·°F)
Btu/(h·ft²·°F)
Btu/(h·ft²·°F)
Swap to CHU/hour/sq. foot/°C to BTU (IT)/hour/sq. foot/°F
Swap to CHU/hour/sq. foot/°C to BTU (IT)/hour/sq. foot/°F
CHU/(h·ft²·°C)
CHU/(h·ft²·°C) 1.00001599
Quick Values:
Conversion Formula
To convert BTU (IT)/hour/sq. foot/°F to CHU/hour/sq. foot/°C, multiply by 1.00001599
Btu/(h·ft²·°F) × 1.00001599 = CHU/(h·ft²·°C)

Calculation: 1 Btu/(h·ft²·°F) × 1.00001599 = 1.00001599 CHU/(h·ft²·°C)

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

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

Tap any row to calculate
BTU (IT)/hour/sq. foot/°F to CHU/hour/sq. foot/°C: Primary Direct Table (15 Steps)
BTU (IT)/hour/sq. foot/°F to CHU/hour/sq. foot/°C Conversion Reference Table
Conversion & Equivalent Value Scientific Notation
0.001 Btu/(h·ft²·°F) 0.00100002 CHU/(h·ft²·°C) 1 × 10⁻³
0.01 Btu/(h·ft²·°F) 0.0100002 CHU/(h·ft²·°C) 1 × 10⁻²
0.1 Btu/(h·ft²·°F) 0.100002 CHU/(h·ft²·°C) 1 × 10⁻¹
0.5 Btu/(h·ft²·°F) 0.500008 CHU/(h·ft²·°C) 5 × 10⁻¹
1 Btu/(h·ft²·°F) 1.000016 CHU/(h·ft²·°C) 1 × 10⁰
2 Btu/(h·ft²·°F) 2.000032 CHU/(h·ft²·°C) 2 × 10⁰
5 Btu/(h·ft²·°F) 5.00008 CHU/(h·ft²·°C) 5 × 10⁰
10 Btu/(h·ft²·°F) 10.00016 CHU/(h·ft²·°C) 1 × 10¹
20 Btu/(h·ft²·°F) 20.00032 CHU/(h·ft²·°C) 2 × 10¹
25 Btu/(h·ft²·°F) 25.0004 CHU/(h·ft²·°C) 2.5 × 10¹
50 Btu/(h·ft²·°F) 50.0008 CHU/(h·ft²·°C) 5 × 10¹
100 Btu/(h·ft²·°F) 100.001599 CHU/(h·ft²·°C) 1 × 10²
250 Btu/(h·ft²·°F) 250.003998 CHU/(h·ft²·°C) 2.5 × 10²
500 Btu/(h·ft²·°F) 500.007995 CHU/(h·ft²·°C) 5 × 10²
1000 Btu/(h·ft²·°F) 1000.01599 CHU/(h·ft²·°C) 1 × 10³
CHU/hour/sq. foot/°C to BTU (IT)/hour/sq. foot/°F: Reciprocal Summary
CHU/hour/sq. foot/°C to BTU (IT)/hour/sq. foot/°F Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 CHU/(h·ft²·°C) 0.999984 Btu/(h·ft²·°F) 1 × 10⁰
5 CHU/(h·ft²·°C) 4.99992 Btu/(h·ft²·°F) 5 × 10⁰
10 CHU/(h·ft²·°C) 9.99984 Btu/(h·ft²·°F) 1 × 10¹
50 CHU/(h·ft²·°C) 49.9992 Btu/(h·ft²·°F) 5 × 10¹
100 CHU/(h·ft²·°C) 99.998401 Btu/(h·ft²·°F) 1 × 10²
View Complete 15-Row CHU/hour/sq. foot/°C to BTU (IT)/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 (IT)/hour/sq. foot/°F (Btu/(h·ft²·°F)) and CHU/hour/sq. foot/°C (CHU/(h·ft²·°C)):

BTU (IT)/hour/sq. foot/°F References:

  • Stationary ambient air natural free convection on vertical wall 0.880551 Btu/(h·ft²·°F)
  • Forced air breeze blowing across automotive cooling radiator 8.8055 Btu/(h·ft²·°F)
  • Liquid water forced circulation inside heat exchanger pipe 528.33 Btu/(h·ft²·°F)
  • Nucleate boiling heat transfer in pressurized steam boiler tube 2641.65 Btu/(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 (IT)/hour/sq. foot/°F to CHU/hour/sq. foot/°C

Converting BTU (IT)/hour/sq. foot/°F (Btu/(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 (IT)/hour/sq. foot/°F equals 1.000016 CHU/hour/sq. foot/°C, while 1 CHU/(h·ft²·°C) equals 0.999984 Btu/(h·ft²·°F).

Direct Factor1 Btu/(h·ft²·°F) = 1.000016 CHU/(h·ft²·°C)
Inverse Ratio1 CHU/(h·ft²·°C) = 0.999984 Btu/(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/(h·ft²·°F) = 5.678263 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 (IT)/hour/sq. foot/°F → CHU/hour/sq. foot/°C:V(CHU/(h·ft²·°C)) = V(Btu/(h·ft²·°F)) × ( 5.678263 / 5.678173 ) = V(Btu/(h·ft²·°F)) × 1.000016
Mathematical FormulaValue in CHU/hour/sq. foot/°C = Value in BTU (IT)/hour/sq. foot/°F × 1.00001599Direct computational formula applied for standard conversion.
Worked Example

Converting 8 Btu/(h·ft²·°F) yields an exact output of 8.000128 CHU/(h·ft²·°C) in CHU/hour/sq. foot/°C. Under higher industrial throughput, 10000 Btu/(h·ft²·°F) translates to 10000.159904 CHU/(h·ft²·°C).

Inverse check: 1 CHU/(h·ft²·°C) = 0.999984 Btu/(h·ft²·°F).

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

BTU (IT)/hour/sq. foot/°F

Btu/(h·ft²·°F)
Imperial / US

A BTU (IT)/hour/sq. foot/°F (Btu/(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 0.880551 Btu/(h·ft²·°F), a forced air breeze blowing across automotive cooling radiator equals 8.8055 Btu/(h·ft²·°F), a liquid water forced circulation inside heat exchanger pipe equals 528.33 Btu/(h·ft²·°F).

Physical Setup

A physical magnitude of 1 Btu/(h·ft²·°F) corresponds to 5.678263 W/(m²·K) in standard SI measurement.

Conversion to SI Unit: watt per square meter kelvin (W/(m²·K))
1 Btu/(h·ft²·°F) = 5.678263 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/(h·ft²·°F) at Forced Air Duct Cooling (ΔT = 25 K) = 141.9566 W/m²
Equals 0.142 kW/m² • 45 BTU/(h·ft²) • 0.00339057 cal/(s·cm²)
SI Heat Flux
141.9566
W/m²
Watts per Square Meter
Solar / Combustion
0.142
kW/m²
Kilowatts per Square Meter
US Building Envelope
45
BTU/(h·ft²)
BTU per Hour Sq. Foot
CGS Thermal
0.00339057
cal/(s·cm²)
Calories per Second Sq. Cm
Meteorology
0.2035
Ly/min
Langley per Minute
Furnace Flux
0.00014196
MW/m²
Megawatts per Square Meter
  1. 1. Normalize Input to SI Base Unit (W/(m²·K)):
    h = 1 Btu/(h·ft²·°F) × 5.67826333 = 5.67826333 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 = (5.67826333 W/(m²·K)) × (25 K) = 141.956583 W/m²
  4. 4. Convert to Standard Engineering Units:
    • W/m²: 141.956583 × 1 = 141.9566 W/m² (Watts per Square Meter) • kW/m²: 141.956583 × 0.001 = 0.142 kW/m² (Kilowatts per Square Meter) • BTU/(h·ft²): 141.956583 × 0.317 = 45 BTU/(h·ft²) (BTU per Hour Sq. Foot) • cal/(s·cm²): 141.956583 × 2.3885 × 10⁻⁵ = 0.00339057 cal/(s·cm²) (Calories per Second Sq. Cm) • Ly/min: 141.956583 × 0.001433 = 0.2035 Ly/min (Langley per Minute) • MW/m²: 141.956583 × 1 × 10⁻⁶ = 0.00014196 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 1.00001599 chus/hour/sq. foot/°c (CHU/(h·ft²·°C)) in 1 btu (it)/hour/sq. foot/°f (Btu/(h·ft²·°F)). To calculate larger amounts manually, simply multiply your total number of btus (it)/hour/sq. foot/°f by the conversion multiplier of 1.00001599.

The mathematical formula to convert btus (it)/hour/sq. foot/°f to chus/hour/sq. foot/°c is: [value] * 1.00001599 = 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 (it)/hour/sq. foot/°f, you must divide your starting value by 1.00001599. Our bidirectional tool automatically computes this inverse equation the moment you type into the chu/hour/sq. foot/°c input field.

1 BTU (IT)/hour/sq. foot/°F is larger than 1 CHU/hour/sq. foot/°C. Specifically, 1 BTU (IT)/hour/sq. foot/°F equals exactly 1.00001599 chus/hour/sq. foot/°c, making it 1 times larger (a difference of 0.00 orders of magnitude). Therefore, quantities expressed in chus/hour/sq. foot/°c require a larger numerical value to represent the same physical amount.

Under standard international measurement guidelines, 1 BTU (IT)/hour/sq. foot/°F converts to 1.00001599 chus/hour/sq. foot/°c. Precise numerical conversion factors ensure consistency across laboratory, engineering, and field data.