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Btus (th)/hour/square foot/°F to Kilocalories (it)/hour/square foot/°C Converter (Btu (th)/(h·ft²·°F) to kcal/(h·ft²·°C))

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Live Conversion • ISO 80000-5:2019 Certified
1 Btu (th)/hour/square foot/°F = 0.45328779 Kilocalorie (IT)/hour/square foot/°C
1 Btu (th)/(h·ft²·°F) = 0.453288 kcal/(h·ft²·°C) • 1 kcal/(h·ft²·°C) = 2.206104 Btu (th)/(h·ft²·°F)
Btu (th)/hour/square foot/°F to Kilocalorie (IT)/hour/square foot/°C: One Btu (th)/hour/square foot/°F is equal to 0.45328779 Kilocalories (it)/hour/square foot/°C.
Certified Authority Value
0.45328779
kcal/(h·ft²·°C)
Exact: 1 kcal/(h·ft²·°C) ≡ 2.2061040034 Btu (th)/(h·ft²·°F)
Btu (th)/(h·ft²·°F)
Btu (th)/(h·ft²·°F)
Swap to Kilocalorie (IT)/hour/square foot/°C to Btu (th)/hour/square foot/°F
Swap to Kilocalorie (IT)/hour/square foot/°C to Btu (th)/hour/square foot/°F
kcal/(h·ft²·°C)
kcal/(h·ft²·°C) 0.45328779
Quick Values:
Conversion Formula
To convert Btu (th)/hour/square foot/°F to Kilocalorie (IT)/hour/square foot/°C, multiply by 0.45328779
Btu (th)/(h·ft²·°F) × 0.45328779 = kcal/(h·ft²·°C)

Calculation: 1 Btu (th)/(h·ft²·°F) × 0.45328779 = 0.45328779 kcal/(h·ft²·°C)

Common Btu (th)/hour/square foot/°F to Kilocalorie (IT)/hour/square foot/°C Calculations

Quick-lookup reference table showing calculated equivalents for standard increments between Btu (th)/hour/square foot/°F (Btu (th)/(h·ft²·°F)) and Kilocalorie (IT)/hour/square foot/°C (kcal/(h·ft²·°C)).

Tap any row to calculate
Btu (th)/hour/square foot/°F to Kilocalorie (IT)/hour/square foot/°C: Primary Direct Table (15 Steps)
Btu (th)/hour/square foot/°F to Kilocalorie (IT)/hour/square foot/°C Conversion Reference Table
Conversion & Equivalent Value Scientific Notation
0.001 Btu (th)/(h·ft²·°F) 0.000453288 kcal/(h·ft²·°C) 4.533 × 10⁻⁴
0.01 Btu (th)/(h·ft²·°F) 0.00453288 kcal/(h·ft²·°C) 4.533 × 10⁻³
0.1 Btu (th)/(h·ft²·°F) 0.0453288 kcal/(h·ft²·°C) 4.533 × 10⁻²
0.5 Btu (th)/(h·ft²·°F) 0.226644 kcal/(h·ft²·°C) 2.266 × 10⁻¹
1 Btu (th)/(h·ft²·°F) 0.453288 kcal/(h·ft²·°C) 4.533 × 10⁻¹
2 Btu (th)/(h·ft²·°F) 0.906576 kcal/(h·ft²·°C) 9.066 × 10⁻¹
5 Btu (th)/(h·ft²·°F) 2.266439 kcal/(h·ft²·°C) 2.266 × 10⁰
10 Btu (th)/(h·ft²·°F) 4.532878 kcal/(h·ft²·°C) 4.533 × 10⁰
20 Btu (th)/(h·ft²·°F) 9.065756 kcal/(h·ft²·°C) 9.066 × 10⁰
25 Btu (th)/(h·ft²·°F) 11.332195 kcal/(h·ft²·°C) 1.133 × 10¹
50 Btu (th)/(h·ft²·°F) 22.664389 kcal/(h·ft²·°C) 2.266 × 10¹
100 Btu (th)/(h·ft²·°F) 45.328779 kcal/(h·ft²·°C) 4.533 × 10¹
250 Btu (th)/(h·ft²·°F) 113.321947 kcal/(h·ft²·°C) 1.133 × 10²
500 Btu (th)/(h·ft²·°F) 226.643893 kcal/(h·ft²·°C) 2.266 × 10²
1000 Btu (th)/(h·ft²·°F) 453.287786 kcal/(h·ft²·°C) 4.533 × 10²
Kilocalorie (IT)/hour/square foot/°C to Btu (th)/hour/square foot/°F: Reciprocal Summary
Kilocalorie (IT)/hour/square foot/°C to Btu (th)/hour/square foot/°F Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 kcal/(h·ft²·°C) 2.206104 Btu (th)/(h·ft²·°F) 2.206 × 10⁰
5 kcal/(h·ft²·°C) 11.03052 Btu (th)/(h·ft²·°F) 1.103 × 10¹
10 kcal/(h·ft²·°C) 22.06104 Btu (th)/(h·ft²·°F) 2.206 × 10¹
50 kcal/(h·ft²·°C) 110.3052 Btu (th)/(h·ft²·°F) 1.103 × 10²
100 kcal/(h·ft²·°C) 220.6104 Btu (th)/(h·ft²·°F) 2.206 × 10²
View Complete 15-Row Kilocalorie (IT)/hour/square foot/°C to Btu (th)/hour/square 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/square foot/°F (Btu (th)/(h·ft²·°F)) and Kilocalorie (IT)/hour/square foot/°C (kcal/(h·ft²·°C)):

Btu (th)/hour/square foot/°F References:

  • Heavy masonry uninsulated cavity wall overall U-factor 0.45 Btu (th)/(h·ft²·°F)

Kilocalorie (IT)/hour/square foot/°C References:

  • Air heating ductwork uninsulated metallic surface heat loss 1.5 kcal/(h·ft²·°C)

Tap any benchmark above to automatically calculate its exact equivalent in Kilocalorie (IT)/hour/square 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/square foot/°F to Kilocalorie (IT)/hour/square foot/°C

Converting Btu (th)/hour/square foot/°F (Btu (th)/(h·ft²·°F)) to Kilocalorie (IT)/hour/square foot/°C (kcal/(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/square foot/°F equals 0.453288 Kilocalorie (IT)/hour/square foot/°C, while 1 kcal/(h·ft²·°C) equals 2.206104 Btu (th)/(h·ft²·°F).

Direct Factor1 Btu (th)/(h·ft²·°F) = 0.453288 kcal/(h·ft²·°C)
Inverse Ratio1 kcal/(h·ft²·°C) = 2.206104 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 kcal/(h·ft²·°C) = 12.518465 watt per square meter kelvin (W/(m²·K))
Step-by-step substitution for Btu (th)/hour/square foot/°F → Kilocalorie (IT)/hour/square foot/°C:V(kcal/(h·ft²·°C)) = V(Btu (th)/(h·ft²·°F)) × ( 5.674467 / 12.518465 ) = V(Btu (th)/(h·ft²·°F)) × 0.453288
Mathematical FormulaValue in Kilocalorie (IT)/hour/square foot/°C = Value in Btu (th)/hour/square foot/°F × 0.45328779Direct computational formula applied for standard conversion.
Worked Example

To convert 12 Btu (th)/hour/square foot/°F (Btu (th)/(h·ft²·°F)) to Kilocalorie (IT)/hour/square foot/°C (kcal/(h·ft²·°C)): multiply 12 by 0.453288 to get 5.439453 kcal/(h·ft²·°C). At an industrial engineering scale, 240 Btu (th)/(h·ft²·°F) converts to 108.789069 kcal/(h·ft²·°C).

Inverse check: 1 kcal/(h·ft²·°C) = 2.206104 Btu (th)/(h·ft²·°F).

Understanding Btu (th)/hour/square foot/°F and Kilocalorie (IT)/hour/square foot/°C

Btu (th)/hour/square foot/°F

Btu (th)/(h·ft²·°F)
Imperial / US

A Btu (th)/hour/square 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 heavy masonry uninsulated cavity wall overall U-factor equals 0.45 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)

Kilocalorie (IT)/hour/square foot/°C

kcal/(h·ft²·°C)
SI Multiple

A Kilocalorie (IT)/hour/square foot/°C (kcal/(h·ft²·°C)) is a decimal multiple of the SI-derived unit for heat transfer coefficient.

Applications & Practical Context

In practical heat transfer coefficient terms, a air heating ductwork uninsulated metallic surface heat loss equals 1.5 kcal/(h·ft²·°C).

Physical Setup

A physical magnitude of 1 kcal/(h·ft²·°C) corresponds to 12.518465 W/(m²·K) in standard SI measurement.

Conversion to SI Unit: watt per square meter kelvin (W/(m²·K))
1 kcal/(h·ft²·°C) = 12.518465 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) × 5.67446717 = 5.67446717 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 = (5.67446717 W/(m²·K)) × (25 K) = 141.861679 W/m²
  4. 4. Convert to Standard Engineering Units:
    • W/m²: 141.861679 × 1 = 141.8617 W/m² (Watts per Square Meter) • kW/m²: 141.861679 × 0.001 = 0.1419 kW/m² (Kilowatts per Square Meter) • BTU/(h·ft²): 141.861679 × 0.317 = 44.9699 BTU/(h·ft²) (BTU per Hour Sq. Foot) • cal/(s·cm²): 141.861679 × 2.3885 × 10⁻⁵ = 0.00338831 cal/(s·cm²) (Calories per Second Sq. Cm) • Ly/min: 141.861679 × 0.001433 = 0.2033 Ly/min (Langley per Minute) • MW/m²: 141.861679 × 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 0.45328779 kilocalories (it)/hour/square foot/°c (kcal/(h·ft²·°C)) in 1 btu (th)/hour/square foot/°f (Btu (th)/(h·ft²·°F)). To calculate larger amounts manually, simply multiply your total number of btus (th)/hour/square foot/°f by the conversion multiplier of 0.45328779.

The mathematical formula to convert btus (th)/hour/square foot/°f to kilocalories (it)/hour/square foot/°c is: [value] * 0.45328779 = kilocalories (it)/hour/square 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 kilocalories (it)/hour/square foot/°c back to btus (th)/hour/square foot/°f, you must divide your starting value by 0.45328779. Our bidirectional tool automatically computes this inverse equation the moment you type into the kilocalorie (it)/hour/square foot/°c input field.

1 Kilocalorie (IT)/hour/square foot/°C is larger than 1 Btu (th)/hour/square foot/°F. Specifically, 1 Btu (th)/hour/square foot/°F equals 0.45328779 kilocalories (it)/hour/square foot/°c, meaning 1 Kilocalorie (IT)/hour/square foot/°C is 2.2061 times larger than 1 Btu (th)/hour/square foot/°F (a difference of 0.34 orders of magnitude). Expressing measurements in btus (th)/hour/square foot/°f requires a larger numerical value to represent the equivalent physical magnitude.

Under standard international measurement guidelines, 1 Btu (th)/hour/square foot/°F converts to 0.45328779 kilocalories (it)/hour/square foot/°c. Precise numerical conversion factors ensure consistency across laboratory, engineering, and field data.