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Btu (th) Inches/second/sq. foot/°F to Calories (th)/second/cm/°C Converter (Btu (th)·in/(s·ft²·°F) to cal (th)/(s·cm·°C))

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Live Conversion • ISO 80000-5:2019 Certified
1 BTU (th) inch/second/sq. foot/°F = 1.24013671 Calorie (th)/second/cm/°C
1 Btu (th)·in/(s·ft²·°F) = 1.240137 cal (th)/(s·cm·°C) • 1 cal (th)/(s·cm·°C) = 0.806363 Btu (th)·in/(s·ft²·°F)
BTU (th) inch/second/sq. foot/°F to Calorie (th)/second/cm/°C: One BTU (th) inch/second/sq. foot/°F is equal to 1.24013671 Calories (th)/second/cm/°C.
Certified Authority Value
1.24013671
cal (th)/(s·cm·°C)
Exact: 1 cal (th)/(s·cm·°C) ≡ 0.8063627106 Btu (th)·in/(s·ft²·°F)
Btu (th)·in/(s·ft²·°F)
Btu (th)·in/(s·ft²·°F)
Swap to Calorie (th)/second/cm/°C to BTU (th) inch/second/sq. foot/°F
Swap to Calorie (th)/second/cm/°C to BTU (th) inch/second/sq. foot/°F
cal (th)/(s·cm·°C)
cal (th)/(s·cm·°C) 1.24013671
Quick Values:
Conversion Formula
To convert BTU (th) inch/second/sq. foot/°F to Calorie (th)/second/cm/°C, multiply by 1.24013671
Btu (th)·in/(s·ft²·°F) × 1.24013671 = cal (th)/(s·cm·°C)

Calculation: 1 Btu (th)·in/(s·ft²·°F) × 1.24013671 = 1.24013671 cal (th)/(s·cm·°C)

Common BTU (th) inch/second/sq. foot/°F to Calorie (th)/second/cm/°C Calculations

Quick-lookup reference table showing calculated equivalents for standard increments between BTU (th) inch/second/sq. foot/°F (Btu (th)·in/(s·ft²·°F)) and Calorie (th)/second/cm/°C (cal (th)/(s·cm·°C)).

Tap any row to calculate
BTU (th) inch/second/sq. foot/°F to Calorie (th)/second/cm/°C: Primary Direct Table (15 Steps)
BTU (th) inch/second/sq. foot/°F to Calorie (th)/second/cm/°C Conversion Reference Table
Conversion & Equivalent Value Scientific Notation
0.001 Btu (th)·in/(s·ft²·°F) 0.00124014 cal (th)/(s·cm·°C) 1.24 × 10⁻³
0.01 Btu (th)·in/(s·ft²·°F) 0.0124014 cal (th)/(s·cm·°C) 1.24 × 10⁻²
0.1 Btu (th)·in/(s·ft²·°F) 0.124014 cal (th)/(s·cm·°C) 1.24 × 10⁻¹
0.5 Btu (th)·in/(s·ft²·°F) 0.620068 cal (th)/(s·cm·°C) 6.201 × 10⁻¹
1 Btu (th)·in/(s·ft²·°F) 1.240137 cal (th)/(s·cm·°C) 1.24 × 10⁰
2 Btu (th)·in/(s·ft²·°F) 2.480273 cal (th)/(s·cm·°C) 2.48 × 10⁰
5 Btu (th)·in/(s·ft²·°F) 6.200684 cal (th)/(s·cm·°C) 6.201 × 10⁰
10 Btu (th)·in/(s·ft²·°F) 12.401367 cal (th)/(s·cm·°C) 1.24 × 10¹
20 Btu (th)·in/(s·ft²·°F) 24.802734 cal (th)/(s·cm·°C) 2.48 × 10¹
25 Btu (th)·in/(s·ft²·°F) 31.003418 cal (th)/(s·cm·°C) 3.1 × 10¹
50 Btu (th)·in/(s·ft²·°F) 62.006836 cal (th)/(s·cm·°C) 6.201 × 10¹
100 Btu (th)·in/(s·ft²·°F) 124.013671 cal (th)/(s·cm·°C) 1.24 × 10²
250 Btu (th)·in/(s·ft²·°F) 310.034178 cal (th)/(s·cm·°C) 3.1 × 10²
500 Btu (th)·in/(s·ft²·°F) 620.068356 cal (th)/(s·cm·°C) 6.201 × 10²
1000 Btu (th)·in/(s·ft²·°F) 1240.136711 cal (th)/(s·cm·°C) 1.24 × 10³
Calorie (th)/second/cm/°C to BTU (th) inch/second/sq. foot/°F: Reciprocal Summary
Calorie (th)/second/cm/°C to BTU (th) inch/second/sq. foot/°F Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 cal (th)/(s·cm·°C) 0.806363 Btu (th)·in/(s·ft²·°F) 8.064 × 10⁻¹
5 cal (th)/(s·cm·°C) 4.031814 Btu (th)·in/(s·ft²·°F) 4.032 × 10⁰
10 cal (th)/(s·cm·°C) 8.063627 Btu (th)·in/(s·ft²·°F) 8.064 × 10⁰
50 cal (th)/(s·cm·°C) 40.318136 Btu (th)·in/(s·ft²·°F) 4.032 × 10¹
100 cal (th)/(s·cm·°C) 80.636271 Btu (th)·in/(s·ft²·°F) 8.064 × 10¹
View Complete 15-Row Calorie (th)/second/cm/°C to BTU (th) inch/second/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/second/sq. foot/°F (Btu (th)·in/(s·ft²·°F)) and Calorie (th)/second/cm/°C (cal (th)/(s·cm·°C)):

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

  • Stationary atmospheric dry air thermal conductivity at sea level 5.0E-5 Btu (th)·in/(s·ft²·°F)
  • Commercial fiberglass building insulation batt thermal conductivity 7.7E-5 Btu (th)·in/(s·ft²·°F)
  • Liquid drinking water thermal conductivity at room temperature 0.001156 Btu (th)·in/(s·ft²·°F)
  • Architectural structural concrete wall thermal conductivity 0.002891 Btu (th)·in/(s·ft²·°F)

Calorie (th)/second/cm/°C References:

  • Stationary atmospheric dry air thermal conductivity at sea level 6.2E-5 cal (th)/(s·cm·°C)
  • Commercial fiberglass building insulation batt thermal conductivity 9.6E-5 cal (th)/(s·cm·°C)
  • Liquid drinking water thermal conductivity at room temperature 0.001434 cal (th)/(s·cm·°C)
  • Architectural structural concrete wall thermal conductivity 0.003585 cal (th)/(s·cm·°C)

Tap any benchmark above to automatically calculate its exact equivalent in Calorie (th)/second/cm/°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/second/sq. foot/°F to Calorie (th)/second/cm/°C

Converting BTU (th) inch/second/sq. foot/°F (Btu (th)·in/(s·ft²·°F)) to Calorie (th)/second/cm/°C (cal (th)/(s·cm·°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/second/sq. foot/°F equals 1.240137 Calorie (th)/second/cm/°C, while 1 cal (th)/(s·cm·°C) equals 0.806363 Btu (th)·in/(s·ft²·°F).

Direct Factor1 Btu (th)·in/(s·ft²·°F) = 1.240137 cal (th)/(s·cm·°C)
Inverse Ratio1 cal (th)/(s·cm·°C) = 0.806363 Btu (th)·in/(s·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/(s·ft²·°F) = 518.8732 watt per meter kelvin (W/(m·K))
2. Target SI Bridge (ktarget):1 cal (th)/(s·cm·°C) = 418.4 watt per meter kelvin (W/(m·K))
Step-by-step substitution for BTU (th) inch/second/sq. foot/°F → Calorie (th)/second/cm/°C:V(cal (th)/(s·cm·°C)) = V(Btu (th)·in/(s·ft²·°F)) × ( 518.8732 / 418.4 ) = V(Btu (th)·in/(s·ft²·°F)) × 1.240137
Mathematical FormulaValue in Calorie (th)/second/cm/°C = Value in BTU (th) inch/second/sq. foot/°F × 1.24013671Direct computational formula applied for standard conversion.
Worked Example

Evaluating an input of 2.5 BTU (th) inch/second/sq. foot/°F (Btu (th)·in/(s·ft²·°F)) produces 3.100342 Calorie (th)/second/cm/°C (cal (th)/(s·cm·°C)). In heavy-duty utility and industrial workloads, 5000 Btu (th)·in/(s·ft²·°F) equals 6200.683556 cal (th)/(s·cm·°C).

Inverse check: 1 cal (th)/(s·cm·°C) = 0.806363 Btu (th)·in/(s·ft²·°F).

Understanding BTU (th) inch/second/sq. foot/°F and Calorie (th)/second/cm/°C

BTU (th) inch/second/sq. foot/°F

Btu (th)·in/(s·ft²·°F)
Imperial / US

A BTU (th) inch/second/sq. foot/°F (Btu (th)·in/(s·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 5 × 10⁻⁵ Btu (th)·in/(s·ft²·°F), a commercial fiberglass building insulation batt thermal conductivity equals 7.7 × 10⁻⁵ Btu (th)·in/(s·ft²·°F), a liquid drinking water thermal conductivity at room temperature equals 0.001156 Btu (th)·in/(s·ft²·°F).

Physical Setup

A physical magnitude of 1 Btu (th)·in/(s·ft²·°F) corresponds to 518.8732 W/(m·K) in standard SI measurement.

Conversion to SI Unit: watt per meter kelvin (W/(m·K))
1 Btu (th)·in/(s·ft²·°F) = 518.8732 W/(m·K)

Calorie (th)/second/cm/°C

cal (th)/(s·cm·°C)
Standard Unit

A Calorie (th)/second/cm/°C (cal (th)/(s·cm·°C)) is a recognized unit for thermal conductivity.

Applications & Practical Context

In practical thermal conductivity terms, a stationary atmospheric dry air thermal conductivity at sea level equals 6.2 × 10⁻⁵ cal (th)/(s·cm·°C), a commercial fiberglass building insulation batt thermal conductivity equals 9.6 × 10⁻⁵ cal (th)/(s·cm·°C), a liquid drinking water thermal conductivity at room temperature equals 0.001434 cal (th)/(s·cm·°C).

Physical Setup

A physical magnitude of 1 cal (th)/(s·cm·°C) corresponds to 418.4 W/(m·K) in standard SI measurement.

Conversion to SI Unit: watt per meter kelvin (W/(m·K))
1 cal (th)/(s·cm·°C) = 418.4 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/(s·ft²·°F) at Insulated Wall Core (20K across 0.1m = 200 K/m) = 103774.64 W/m²
Equals 103.7746 kW/m² • 32896.3944 BTU/(h·ft²) • 2.478615 cal/(s·cm²)
SI Heat Flux
103774.64
W/m²
Watts per Square Meter
Solar / Combustion
103.7746
kW/m²
Kilowatts per Square Meter
US Building Envelope
32896.3944
BTU/(h·ft²)
BTU per Hour Sq. Foot
CGS Thermal
2.478615
cal/(s·cm²)
Calories per Second Sq. Cm
Meteorology
148.7436
Ly/min
Langley per Minute
Furnace Flux
0.103775
MW/m²
Megawatts per Square Meter
  1. 1. Normalize Input to SI Base Unit (W/(m·K)):
    k = 1 Btu (th)·in/(s·ft²·°F) × 518.8732 = 518.8732 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 = (518.8732 W/(m·K)) × (200 K/m) = 103774.64 W/m²
  4. 4. Convert to Standard Engineering Units:
    • W/m²: 103774.64 × 1 = 103774.64 W/m² (Watts per Square Meter) • kW/m²: 103774.64 × 0.001 = 103.7746 kW/m² (Kilowatts per Square Meter) • BTU/(h·ft²): 103774.64 × 0.317 = 32896.3944 BTU/(h·ft²) (BTU per Hour Sq. Foot) • cal/(s·cm²): 103774.64 × 2.3885 × 10⁻⁵ = 2.478615 cal/(s·cm²) (Calories per Second Sq. Cm) • Ly/min: 103774.64 × 0.001433 = 148.7436 Ly/min (Langley per Minute) • MW/m²: 103774.64 × 1 × 10⁻⁶ = 0.103775 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 1.24013671 calories (th)/second/cm/°c (cal (th)/(s·cm·°C)) in 1 btu (th) inch/second/sq. foot/°f (Btu (th)·in/(s·ft²·°F)). To calculate larger amounts manually, simply multiply your total number of btu (th) inches/second/sq. foot/°f by the conversion multiplier of 1.24013671.

The mathematical formula to convert btu (th) inches/second/sq. foot/°f to calories (th)/second/cm/°c is: [value] * 1.24013671 = calories (th)/second/cm/°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 calories (th)/second/cm/°c back to btu (th) inches/second/sq. foot/°f, you must divide your starting value by 1.24013671. Our bidirectional tool automatically computes this inverse equation the moment you type into the calorie (th)/second/cm/°c input field.

1 BTU (th) inch/second/sq. foot/°F is larger than 1 Calorie (th)/second/cm/°C. Specifically, 1 BTU (th) inch/second/sq. foot/°F equals exactly 1.24013671 calories (th)/second/cm/°c, making it 1.2401 times larger (a difference of 0.09 orders of magnitude). Therefore, quantities expressed in calories (th)/second/cm/°c require a larger numerical value to represent the same physical amount.

Under standard international measurement guidelines, 1 BTU (th) inch/second/sq. foot/°F converts to 1.24013671 calories (th)/second/cm/°c. Precise numerical conversion factors ensure consistency across laboratory, engineering, and field data.