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Btu (th) Inches/hour/sq. foot/°F to Kilocalories (it)/hour/meter/°C Converter (Btu (th)·in/(h·ft²·°F) to kcal/(h·m·°C))

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Live Conversion • ISO 80000-5:2019 Certified
1 BTU (th) inch/hour/sq. foot/°F = 0.1239307 Kilocalorie (IT)/hour/meter/°C
1 Btu (th)·in/(h·ft²·°F) = 0.123931 kcal/(h·m·°C) • 1 kcal/(h·m·°C) = 8.069026 Btu (th)·in/(h·ft²·°F)
BTU (th) inch/hour/sq. foot/°F to Kilocalorie (IT)/hour/meter/°C: One BTU (th) inch/hour/sq. foot/°F is equal to 0.1239307 Kilocalories (it)/hour/meter/°C.
Certified Authority Value
0.12393070
kcal/(h·m·°C)
Exact: 1 kcal/(h·m·°C) ≡ 8.0690259028 Btu (th)·in/(h·ft²·°F)
Btu (th)·in/(h·ft²·°F)
Btu (th)·in/(h·ft²·°F)
Swap to Kilocalorie (IT)/hour/meter/°C to BTU (th) inch/hour/sq. foot/°F
Swap to Kilocalorie (IT)/hour/meter/°C to BTU (th) inch/hour/sq. foot/°F
kcal/(h·m·°C)
kcal/(h·m·°C) 0.1239307
Quick Values:
Conversion Formula
To convert BTU (th) inch/hour/sq. foot/°F to Kilocalorie (IT)/hour/meter/°C, multiply by 0.1239307
Btu (th)·in/(h·ft²·°F) × 0.1239307 = kcal/(h·m·°C)

Calculation: 1 Btu (th)·in/(h·ft²·°F) × 0.1239307 = 0.1239307 kcal/(h·m·°C)

Common BTU (th) inch/hour/sq. foot/°F to Kilocalorie (IT)/hour/meter/°C Calculations

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

Tap any row to calculate
BTU (th) inch/hour/sq. foot/°F to Kilocalorie (IT)/hour/meter/°C: Primary Direct Table (15 Steps)
BTU (th) inch/hour/sq. foot/°F to Kilocalorie (IT)/hour/meter/°C Conversion Reference Table
Conversion & Equivalent Value Scientific Notation
0.001 Btu (th)·in/(h·ft²·°F) 0.000123931 kcal/(h·m·°C) 1.239 × 10⁻⁴
0.01 Btu (th)·in/(h·ft²·°F) 0.00123931 kcal/(h·m·°C) 1.239 × 10⁻³
0.1 Btu (th)·in/(h·ft²·°F) 0.0123931 kcal/(h·m·°C) 1.239 × 10⁻²
0.5 Btu (th)·in/(h·ft²·°F) 0.0619653 kcal/(h·m·°C) 6.197 × 10⁻²
1 Btu (th)·in/(h·ft²·°F) 0.123931 kcal/(h·m·°C) 1.239 × 10⁻¹
2 Btu (th)·in/(h·ft²·°F) 0.247861 kcal/(h·m·°C) 2.479 × 10⁻¹
5 Btu (th)·in/(h·ft²·°F) 0.619653 kcal/(h·m·°C) 6.197 × 10⁻¹
10 Btu (th)·in/(h·ft²·°F) 1.239307 kcal/(h·m·°C) 1.239 × 10⁰
20 Btu (th)·in/(h·ft²·°F) 2.478614 kcal/(h·m·°C) 2.479 × 10⁰
25 Btu (th)·in/(h·ft²·°F) 3.098267 kcal/(h·m·°C) 3.098 × 10⁰
50 Btu (th)·in/(h·ft²·°F) 6.196535 kcal/(h·m·°C) 6.197 × 10⁰
100 Btu (th)·in/(h·ft²·°F) 12.39307 kcal/(h·m·°C) 1.239 × 10¹
250 Btu (th)·in/(h·ft²·°F) 30.982674 kcal/(h·m·°C) 3.098 × 10¹
500 Btu (th)·in/(h·ft²·°F) 61.965348 kcal/(h·m·°C) 6.197 × 10¹
1000 Btu (th)·in/(h·ft²·°F) 123.930696 kcal/(h·m·°C) 1.239 × 10²
Kilocalorie (IT)/hour/meter/°C to BTU (th) inch/hour/sq. foot/°F: Reciprocal Summary
Kilocalorie (IT)/hour/meter/°C to BTU (th) inch/hour/sq. foot/°F Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 kcal/(h·m·°C) 8.069026 Btu (th)·in/(h·ft²·°F) 8.069 × 10⁰
5 kcal/(h·m·°C) 40.34513 Btu (th)·in/(h·ft²·°F) 4.035 × 10¹
10 kcal/(h·m·°C) 80.690259 Btu (th)·in/(h·ft²·°F) 8.069 × 10¹
50 kcal/(h·m·°C) 403.451295 Btu (th)·in/(h·ft²·°F) 4.035 × 10²
100 kcal/(h·m·°C) 806.90259 Btu (th)·in/(h·ft²·°F) 8.069 × 10²
View Complete 15-Row Kilocalorie (IT)/hour/meter/°C to BTU (th) inch/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) inch/hour/sq. foot/°F (Btu (th)·in/(h·ft²·°F)) and Kilocalorie (IT)/hour/meter/°C (kcal/(h·m·°C)):

BTU (th) inch/hour/sq. foot/°F References:

  • Stationary atmospheric dry air thermal conductivity at sea level 0.180391 Btu (th)·in/(h·ft²·°F)
  • Commercial fiberglass building insulation batt thermal conductivity 0.277525 Btu (th)·in/(h·ft²·°F)
  • Liquid drinking water thermal conductivity at room temperature 4.1629 Btu (th)·in/(h·ft²·°F)
  • Architectural structural concrete wall thermal conductivity 10.4072 Btu (th)·in/(h·ft²·°F)

Kilocalorie (IT)/hour/meter/°C References:

  • Stationary atmospheric dry air thermal conductivity at sea level 0.022356 kcal/(h·m·°C)
  • Commercial fiberglass building insulation batt thermal conductivity 0.034394 kcal/(h·m·°C)
  • Liquid drinking water thermal conductivity at room temperature 0.515907 kcal/(h·m·°C)
  • Architectural structural concrete wall thermal conductivity 1.2898 kcal/(h·m·°C)

Tap any benchmark above to automatically calculate its exact equivalent in Kilocalorie (IT)/hour/meter/°C.

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

How to Convert BTU (th) inch/hour/sq. foot/°F to Kilocalorie (IT)/hour/meter/°C

Converting BTU (th) inch/hour/sq. foot/°F (Btu (th)·in/(h·ft²·°F)) to Kilocalorie (IT)/hour/meter/°C (kcal/(h·m·°C)) is a core calculation in Thermal Conductivity, which measures a material's intrinsic capacity to conduct and transfer heat through microscopic collisions. 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) inch/hour/sq. foot/°F equals 0.123931 Kilocalorie (IT)/hour/meter/°C, while 1 kcal/(h·m·°C) equals 8.069026 Btu (th)·in/(h·ft²·°F).

Direct Factor1 Btu (th)·in/(h·ft²·°F) = 0.123931 kcal/(h·m·°C)
Inverse Ratio1 kcal/(h·m·°C) = 8.069026 Btu (th)·in/(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 meter kelvin (W/(m·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)·in/(h·ft²·°F) = 0.144131 watt per meter kelvin (W/(m·K))
2. Target SI Bridge (ktarget):1 kcal/(h·m·°C) = 1.163 watt per meter kelvin (W/(m·K))
Step-by-step substitution for BTU (th) inch/hour/sq. foot/°F → Kilocalorie (IT)/hour/meter/°C:V(kcal/(h·m·°C)) = V(Btu (th)·in/(h·ft²·°F)) × ( 0.144131 / 1.163 ) = V(Btu (th)·in/(h·ft²·°F)) × 0.123931
Mathematical FormulaValue in Kilocalorie (IT)/hour/meter/°C = Value in BTU (th) inch/hour/sq. foot/°F × 0.1239307Direct computational formula applied for standard conversion.
Worked Example

Converting 8 Btu (th)·in/(h·ft²·°F) yields an exact output of 0.991446 kcal/(h·m·°C) in Kilocalorie (IT)/hour/meter/°C. Under higher industrial throughput, 480 Btu (th)·in/(h·ft²·°F) translates to 59.486734 kcal/(h·m·°C).

Inverse check: 1 kcal/(h·m·°C) = 8.069026 Btu (th)·in/(h·ft²·°F).

Understanding BTU (th) inch/hour/sq. foot/°F and Kilocalorie (IT)/hour/meter/°C

BTU (th) inch/hour/sq. foot/°F

Btu (th)·in/(h·ft²·°F)
Imperial / US

A BTU (th) inch/hour/sq. foot/°F (Btu (th)·in/(h·ft²·°F)) is an imperial and US customary unit for thermal conductivity.

Applications & Practical Context

In practical thermal conductivity terms, a stationary atmospheric dry air thermal conductivity at sea level equals 0.180391 Btu (th)·in/(h·ft²·°F), a commercial fiberglass building insulation batt thermal conductivity equals 0.277525 Btu (th)·in/(h·ft²·°F), a liquid drinking water thermal conductivity at room temperature equals 4.1629 Btu (th)·in/(h·ft²·°F).

Physical Setup

A physical magnitude of 1 Btu (th)·in/(h·ft²·°F) corresponds to 0.144131 W/(m·K) in standard SI measurement.

Conversion to SI Unit: watt per meter kelvin (W/(m·K))
1 Btu (th)·in/(h·ft²·°F) = 0.144131 W/(m·K)

Kilocalorie (IT)/hour/meter/°C

kcal/(h·m·°C)
SI Multiple

A Kilocalorie (IT)/hour/meter/°C (kcal/(h·m·°C)) is a decimal multiple of the SI-derived unit for thermal conductivity.

Applications & Practical Context

In practical thermal conductivity terms, a stationary atmospheric dry air thermal conductivity at sea level equals 0.022356 kcal/(h·m·°C), a commercial fiberglass building insulation batt thermal conductivity equals 0.034394 kcal/(h·m·°C), a liquid drinking water thermal conductivity at room temperature equals 0.515907 kcal/(h·m·°C).

Physical Setup

A physical magnitude of 1 kcal/(h·m·°C) corresponds to 1.163 W/(m·K) in standard SI measurement.

Conversion to SI Unit: watt per meter kelvin (W/(m·K))
1 kcal/(h·m·°C) = 1.163 W/(m·K)

Domain Metrology & Engineering Applications

Governing Law & Equation

Fourier's Law of Heat Conduction (q = -k · ∇T)

Measurement Instrumentation

Rigorously quantified in laboratory and field settings using guarded hot plate apparatus (ASTM C177), laser flash thermal diffusivity analyzers, and transient plane source (TPS) sensors.

Primary Industry Sectors

Applied across thermal interface material (TIM) development, architectural insulation manufacturing, aerospace heat shield design, and refractory ceramics under international metrology standard ISO 80000-5:2019, ASTM C177.

Institutional Metrology & Standard Authority:

Formulas, conversion coefficients, and base definitions on this page strictly adhere to the ISO 80000-5:2019, ASTM C177 and the BIPM SI Brochure (9th Edition). Governed by Fourier's Law of Heat Conduction (q = -k · ∇T) under ISO 80000 dimensional vector [M L T⁻³ Θ⁻¹].

Multi-Variable Engineering Bridge Heat Transfer & Conduction Physics

Thermal Conductivity to Heat Flux Density Bridge (W/m² • kW/m² • BTU/(h·ft²) • cal/(s·cm²))

Calculate Fourier conduction heat flux q" = k × ∇T across building envelopes and industrial heat exchangers, bridging thermal conductivity [M L T⁻³ Θ⁻¹] with heat flux density [M T⁻³].

q" = k × ∇T
Vector: [W/(m·K)] × [K/m] → [W/m²]
Live Calculated Bridge Equivalent:
1 Btu (th)·in/(h·ft²·°F) at Insulated Wall Core (20K across 0.1m = 200 K/m) = 28.8263 W/m²
Equals 0.02883 kW/m² • 9.1379 BTU/(h·ft²) • 0.0006885 cal/(s·cm²)
SI Heat Flux
28.8263
W/m²
Watts per Square Meter
Solar / Combustion
0.02883
kW/m²
Kilowatts per Square Meter
US Building Envelope
9.1379
BTU/(h·ft²)
BTU per Hour Sq. Foot
CGS Thermal
0.0006885
cal/(s·cm²)
Calories per Second Sq. Cm
Meteorology
0.04132
Ly/min
Langley per Minute
Furnace Flux
2.882628 × 10⁻⁵
MW/m²
Megawatts per Square Meter
  1. 1. Normalize Input to SI Base Unit (W/(m·K)):
    k = 1 Btu (th)·in/(h·ft²·°F) × 0.1441314 = 0.1441314 W/(m·K)
  2. 2. Apply Engineering Parameter (∇T):
    Selected condition: Insulated Wall Core (20K across 0.1m = 200 K/m) at ∇T = 200 K/m
  3. 3. Execute Governing Physical Law in SI Units:
    q" = k × ∇T = (0.1441314 W/(m·K)) × (200 K/m) = 28.82628 W/m²
  4. 4. Convert to Standard Engineering Units:
    • W/m²: 28.82628 × 1 = 28.8263 W/m² (Watts per Square Meter) • kW/m²: 28.82628 × 0.001 = 0.02883 kW/m² (Kilowatts per Square Meter) • BTU/(h·ft²): 28.82628 × 0.317 = 9.1379 BTU/(h·ft²) (BTU per Hour Sq. Foot) • cal/(s·cm²): 28.82628 × 2.3885 × 10⁻⁵ = 0.0006885 cal/(s·cm²) (Calories per Second Sq. Cm) • Ly/min: 28.82628 × 0.001433 = 0.04132 Ly/min (Langley per Minute) • MW/m²: 28.82628 × 1 × 10⁻⁶ = 2.882628 × 10⁻⁵ MW/m² (Megawatts per Square Meter)
Explore Full Heat Flux Density Converter →
Engineering Substance / Operating Standard Parameter Value (K/m) Reference State / Condition Typical Industrial & Engineering Application
Insulated Wall Core (20K across 0.1m = 200 K/m) 200 200 K/m Standard residential fiberglass/mineral wool batt
Solid Brick Masonry (25K across 0.25m = 100 K/m) 100 100 K/m Architectural structural brick veneer wall
Steam Boiler Tube Wall (100K across 0.005m = 20,000 K/m) 20000 20,000 K/m Carbon steel heat recovery steam boiler tube
CPU Copper Heat Spreader (30K across 0.002m = 15,000 K/m) 15000 15,000 K/m Semiconductor thermal interface heat spreader
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Frequently Asked Questions

There are exactly 0.1239307 kilocalories (it)/hour/meter/°c (kcal/(h·m·°C)) in 1 btu (th) inch/hour/sq. foot/°f (Btu (th)·in/(h·ft²·°F)). To calculate larger amounts manually, simply multiply your total number of btu (th) inches/hour/sq. foot/°f by the conversion multiplier of 0.1239307.

The mathematical formula to convert btu (th) inches/hour/sq. foot/°f to kilocalories (it)/hour/meter/°c is: [value] * 0.1239307 = kilocalories (it)/hour/meter/°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/meter/°c back to btu (th) inches/hour/sq. foot/°f, you must divide your starting value by 0.1239307. Our bidirectional tool automatically computes this inverse equation the moment you type into the kilocalorie (it)/hour/meter/°c input field.

1 Kilocalorie (IT)/hour/meter/°C is larger than 1 BTU (th) inch/hour/sq. foot/°F. Specifically, 1 BTU (th) inch/hour/sq. foot/°F equals 0.1239307 kilocalories (it)/hour/meter/°c, meaning 1 Kilocalorie (IT)/hour/meter/°C is 8.069 times larger than 1 BTU (th) inch/hour/sq. foot/°F (a difference of 0.91 orders of magnitude). Expressing measurements in btu (th) inches/hour/sq. foot/°f requires a larger numerical value to represent the equivalent physical magnitude.

Under standard international measurement guidelines, 1 BTU (th) inch/hour/sq. foot/°F converts to 0.1239307 kilocalories (it)/hour/meter/°c. Precise numerical conversion factors ensure consistency across laboratory, engineering, and field data.