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

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Live Conversion • ISO 80000-5:2019 Certified
1 BTU (IT) inch/hour/sq. foot/°F = 0.12409669 Kilocalorie (th)/hour/meter/°C
1 Btu·in/(h·ft²·°F) = 0.124097 kcal (th)/(h·m·°C) • 1 kcal (th)/(h·m·°C) = 8.058233 Btu·in/(h·ft²·°F)
BTU (IT) inch/hour/sq. foot/°F to Kilocalorie (th)/hour/meter/°C: One BTU (IT) inch/hour/sq. foot/°F is equal to 0.12409669 Kilocalories (th)/hour/meter/°C.
Certified Authority Value
0.12409669
kcal (th)/(h·m·°C)
Exact: 1 kcal (th)/(h·m·°C) ≡ 8.0582328384 Btu·in/(h·ft²·°F)
Btu·in/(h·ft²·°F)
Btu·in/(h·ft²·°F)
Swap to Kilocalorie (th)/hour/meter/°C to BTU (IT) inch/hour/sq. foot/°F
Swap to Kilocalorie (th)/hour/meter/°C to BTU (IT) inch/hour/sq. foot/°F
kcal (th)/(h·m·°C)
kcal (th)/(h·m·°C) 0.12409669
Quick Values:
Conversion Formula
To convert BTU (IT) inch/hour/sq. foot/°F to Kilocalorie (th)/hour/meter/°C, multiply by 0.12409669
Btu·in/(h·ft²·°F) × 0.12409669 = kcal (th)/(h·m·°C)

Calculation: 1 Btu·in/(h·ft²·°F) × 0.12409669 = 0.12409669 kcal (th)/(h·m·°C)

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

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

Tap any row to calculate
BTU (IT) inch/hour/sq. foot/°F to Kilocalorie (th)/hour/meter/°C: Primary Direct Table (15 Steps)
BTU (IT) inch/hour/sq. foot/°F to Kilocalorie (th)/hour/meter/°C Conversion Reference Table
Conversion & Equivalent Value Scientific Notation
0.001 Btu·in/(h·ft²·°F) 0.000124097 kcal (th)/(h·m·°C) 1.241 × 10⁻⁴
0.01 Btu·in/(h·ft²·°F) 0.00124097 kcal (th)/(h·m·°C) 1.241 × 10⁻³
0.1 Btu·in/(h·ft²·°F) 0.0124097 kcal (th)/(h·m·°C) 1.241 × 10⁻²
0.5 Btu·in/(h·ft²·°F) 0.0620483 kcal (th)/(h·m·°C) 6.205 × 10⁻²
1 Btu·in/(h·ft²·°F) 0.124097 kcal (th)/(h·m·°C) 1.241 × 10⁻¹
2 Btu·in/(h·ft²·°F) 0.248193 kcal (th)/(h·m·°C) 2.482 × 10⁻¹
5 Btu·in/(h·ft²·°F) 0.620483 kcal (th)/(h·m·°C) 6.205 × 10⁻¹
10 Btu·in/(h·ft²·°F) 1.240967 kcal (th)/(h·m·°C) 1.241 × 10⁰
20 Btu·in/(h·ft²·°F) 2.481934 kcal (th)/(h·m·°C) 2.482 × 10⁰
25 Btu·in/(h·ft²·°F) 3.102417 kcal (th)/(h·m·°C) 3.102 × 10⁰
50 Btu·in/(h·ft²·°F) 6.204834 kcal (th)/(h·m·°C) 6.205 × 10⁰
100 Btu·in/(h·ft²·°F) 12.409669 kcal (th)/(h·m·°C) 1.241 × 10¹
250 Btu·in/(h·ft²·°F) 31.024172 kcal (th)/(h·m·°C) 3.102 × 10¹
500 Btu·in/(h·ft²·°F) 62.048344 kcal (th)/(h·m·°C) 6.205 × 10¹
1000 Btu·in/(h·ft²·°F) 124.096687 kcal (th)/(h·m·°C) 1.241 × 10²
Kilocalorie (th)/hour/meter/°C to BTU (IT) inch/hour/sq. foot/°F: Reciprocal Summary
Kilocalorie (th)/hour/meter/°C to BTU (IT) inch/hour/sq. foot/°F Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 kcal (th)/(h·m·°C) 8.058233 Btu·in/(h·ft²·°F) 8.058 × 10⁰
5 kcal (th)/(h·m·°C) 40.291164 Btu·in/(h·ft²·°F) 4.029 × 10¹
10 kcal (th)/(h·m·°C) 80.582328 Btu·in/(h·ft²·°F) 8.058 × 10¹
50 kcal (th)/(h·m·°C) 402.911642 Btu·in/(h·ft²·°F) 4.029 × 10²
100 kcal (th)/(h·m·°C) 805.823284 Btu·in/(h·ft²·°F) 8.058 × 10²
View Complete 15-Row Kilocalorie (th)/hour/meter/°C to BTU (IT) 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 (IT) inch/hour/sq. foot/°F (Btu·in/(h·ft²·°F)) and Kilocalorie (th)/hour/meter/°C (kcal (th)/(h·m·°C)):

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

  • Stationary atmospheric dry air thermal conductivity at sea level 0.18027 Btu·in/(h·ft²·°F)
  • Commercial fiberglass building insulation batt thermal conductivity 0.277339 Btu·in/(h·ft²·°F)
  • Liquid drinking water thermal conductivity at room temperature 4.1601 Btu·in/(h·ft²·°F)
  • Architectural structural concrete wall thermal conductivity 10.4002 Btu·in/(h·ft²·°F)

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

  • Stationary atmospheric dry air thermal conductivity at sea level 0.022371 kcal (th)/(h·m·°C)
  • Commercial fiberglass building insulation batt thermal conductivity 0.034417 kcal (th)/(h·m·°C)
  • Liquid drinking water thermal conductivity at room temperature 0.516252 kcal (th)/(h·m·°C)
  • Architectural structural concrete wall thermal conductivity 1.2906 kcal (th)/(h·m·°C)

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

Converting BTU (IT) inch/hour/sq. foot/°F (Btu·in/(h·ft²·°F)) to Kilocalorie (th)/hour/meter/°C (kcal (th)/(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 (IT) inch/hour/sq. foot/°F equals 0.124097 Kilocalorie (th)/hour/meter/°C, while 1 kcal (th)/(h·m·°C) equals 8.058233 Btu·in/(h·ft²·°F).

Direct Factor1 Btu·in/(h·ft²·°F) = 0.124097 kcal (th)/(h·m·°C)
Inverse Ratio1 kcal (th)/(h·m·°C) = 8.058233 Btu·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·in/(h·ft²·°F) = 0.144228 watt per meter kelvin (W/(m·K))
2. Target SI Bridge (ktarget):1 kcal (th)/(h·m·°C) = 1.162222 watt per meter kelvin (W/(m·K))
Step-by-step substitution for BTU (IT) inch/hour/sq. foot/°F → Kilocalorie (th)/hour/meter/°C:V(kcal (th)/(h·m·°C)) = V(Btu·in/(h·ft²·°F)) × ( 0.144228 / 1.162222 ) = V(Btu·in/(h·ft²·°F)) × 0.124097
Mathematical FormulaValue in Kilocalorie (th)/hour/meter/°C = Value in BTU (IT) inch/hour/sq. foot/°F × 0.12409669Direct computational formula applied for standard conversion.
Worked Example

For an engineering input of 250 Btu·in/(h·ft²·°F), applying the conversion factor yields exactly 31.024172 kcal (th)/(h·m·°C). At larger operational scale, 100 BTU (IT) inch/hour/sq. foot/°F corresponds to 12.409669 kcal (th)/(h·m·°C).

Inverse check: 1 kcal (th)/(h·m·°C) = 8.058233 Btu·in/(h·ft²·°F).

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

BTU (IT) inch/hour/sq. foot/°F

Btu·in/(h·ft²·°F)
Imperial / US

A BTU (IT) inch/hour/sq. foot/°F (Btu·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 0.18027 Btu·in/(h·ft²·°F), a commercial fiberglass building insulation batt thermal conductivity equals 0.277339 Btu·in/(h·ft²·°F), a liquid drinking water thermal conductivity at room temperature equals 4.1601 Btu·in/(h·ft²·°F).

Physical Setup

A physical magnitude of 1 Btu·in/(h·ft²·°F) corresponds to 0.144228 W/(m·K) in standard SI measurement.

Conversion to SI Unit: watt per meter kelvin (W/(m·K))
1 Btu·in/(h·ft²·°F) = 0.144228 W/(m·K)

Kilocalorie (th)/hour/meter/°C

kcal (th)/(h·m·°C)
SI Multiple

A Kilocalorie (th)/hour/meter/°C (kcal (th)/(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 0.022371 kcal (th)/(h·m·°C), a commercial fiberglass building insulation batt thermal conductivity equals 0.034417 kcal (th)/(h·m·°C), a liquid drinking water thermal conductivity at room temperature equals 0.516252 kcal (th)/(h·m·°C).

Physical Setup

A physical magnitude of 1 kcal (th)/(h·m·°C) corresponds to 1.162222 W/(m·K) in standard SI measurement.

Conversion to SI Unit: watt per meter kelvin (W/(m·K))
1 kcal (th)/(h·m·°C) = 1.162222 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·in/(h·ft²·°F) at Insulated Wall Core (20K across 0.1m = 200 K/m) = 28.8456 W/m²
Equals 0.02885 kW/m² • 9.144 BTU/(h·ft²) • 0.00068896 cal/(s·cm²)
SI Heat Flux
28.8456
W/m²
Watts per Square Meter
Solar / Combustion
0.02885
kW/m²
Kilowatts per Square Meter
US Building Envelope
9.144
BTU/(h·ft²)
BTU per Hour Sq. Foot
CGS Thermal
0.00068896
cal/(s·cm²)
Calories per Second Sq. Cm
Meteorology
0.04135
Ly/min
Langley per Minute
Furnace Flux
2.884558 × 10⁻⁵
MW/m²
Megawatts per Square Meter
  1. 1. Normalize Input to SI Base Unit (W/(m·K)):
    k = 1 Btu·in/(h·ft²·°F) × 0.1442279 = 0.1442279 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 = (0.1442279 W/(m·K)) × (200 K/m) = 28.84558 W/m²
  4. 4. Convert to Standard Engineering Units:
    • W/m²: 28.84558 × 1 = 28.8456 W/m² (Watts per Square Meter) • kW/m²: 28.84558 × 0.001 = 0.02885 kW/m² (Kilowatts per Square Meter) • BTU/(h·ft²): 28.84558 × 0.317 = 9.144 BTU/(h·ft²) (BTU per Hour Sq. Foot) • cal/(s·cm²): 28.84558 × 2.3885 × 10⁻⁵ = 0.00068896 cal/(s·cm²) (Calories per Second Sq. Cm) • Ly/min: 28.84558 × 0.001433 = 0.04135 Ly/min (Langley per Minute) • MW/m²: 28.84558 × 1 × 10⁻⁶ = 2.884558 × 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 0.12409669 kilocalories (th)/hour/meter/°c (kcal (th)/(h·m·°C)) in 1 btu (it) inch/hour/sq. foot/°f (Btu·in/(h·ft²·°F)). To calculate larger amounts manually, simply multiply your total number of btu (it) inches/hour/sq. foot/°f by the conversion multiplier of 0.12409669.

The mathematical formula to convert btu (it) inches/hour/sq. foot/°f to kilocalories (th)/hour/meter/°c is: [value] * 0.12409669 = kilocalories (th)/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 (th)/hour/meter/°c back to btu (it) inches/hour/sq. foot/°f, you must divide your starting value by 0.12409669. Our bidirectional tool automatically computes this inverse equation the moment you type into the kilocalorie (th)/hour/meter/°c input field.

1 Kilocalorie (th)/hour/meter/°C is larger than 1 BTU (IT) inch/hour/sq. foot/°F. Specifically, 1 BTU (IT) inch/hour/sq. foot/°F equals 0.12409669 kilocalories (th)/hour/meter/°c, meaning 1 Kilocalorie (th)/hour/meter/°C is 8.0582 times larger than 1 BTU (IT) inch/hour/sq. foot/°F (a difference of 0.91 orders of magnitude). Expressing measurements in btu (it) inches/hour/sq. foot/°f requires a larger numerical value to represent the equivalent physical magnitude.

Under standard international measurement guidelines, 1 BTU (IT) inch/hour/sq. foot/°F converts to 0.12409669 kilocalories (th)/hour/meter/°c. Precise numerical conversion factors ensure consistency across laboratory, engineering, and field data.