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

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Live Conversion • ISO 80000-5:2019 Certified
1 Btu (th)/second/square foot/°F = 1631.84343847 Kilocalorie (IT)/hour/square foot/°C
1 Btu (th)/(s·ft²·°F) = 1631.843438 kcal/(h·ft²·°C) • 1 kcal/(h·ft²·°C) = 0.000612804 Btu (th)/(s·ft²·°F)
Btu (th)/second/square foot/°F to Kilocalorie (IT)/hour/square foot/°C: One Btu (th)/second/square foot/°F is equal to 1631.84343847 Kilocalories (it)/hour/square foot/°C.
Certified Authority Value
1631.84343847
kcal/(h·ft²·°C)
Exact: 1 kcal/(h·ft²·°C) ≡ 0.0006128038857 Btu (th)/(s·ft²·°F)
Btu (th)/(s·ft²·°F)
Btu (th)/(s·ft²·°F)
Swap to Kilocalorie (IT)/hour/square foot/°C to Btu (th)/second/square foot/°F
Swap to Kilocalorie (IT)/hour/square foot/°C to Btu (th)/second/square foot/°F
kcal/(h·ft²·°C)
kcal/(h·ft²·°C) 1631.84343847
Quick Values:
Conversion Formula
To convert Btu (th)/second/square foot/°F to Kilocalorie (IT)/hour/square foot/°C, multiply by 1631.84343847
Btu (th)/(s·ft²·°F) × 1631.84343847 = kcal/(h·ft²·°C)

Calculation: 1 Btu (th)/(s·ft²·°F) × 1631.84343847 = 1631.84343847 kcal/(h·ft²·°C)

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

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

Tap any row to calculate
Btu (th)/second/square foot/°F to Kilocalorie (IT)/hour/square foot/°C: Primary Direct Table (15 Steps)
Btu (th)/second/square foot/°F to Kilocalorie (IT)/hour/square foot/°C Conversion Reference Table
Conversion & Equivalent Value Scientific Notation
0.001 Btu (th)/(s·ft²·°F) 1.631843 kcal/(h·ft²·°C) 1.632 × 10⁰
0.01 Btu (th)/(s·ft²·°F) 16.318434 kcal/(h·ft²·°C) 1.632 × 10¹
0.1 Btu (th)/(s·ft²·°F) 163.184344 kcal/(h·ft²·°C) 1.632 × 10²
0.5 Btu (th)/(s·ft²·°F) 815.921719 kcal/(h·ft²·°C) 8.159 × 10²
1 Btu (th)/(s·ft²·°F) 1631.843438 kcal/(h·ft²·°C) 1.632 × 10³
2 Btu (th)/(s·ft²·°F) 3263.686877 kcal/(h·ft²·°C) 3.264 × 10³
5 Btu (th)/(s·ft²·°F) 8159.217192 kcal/(h·ft²·°C) 8.159 × 10³
10 Btu (th)/(s·ft²·°F) 16318.434385 kcal/(h·ft²·°C) 1.632 × 10⁴
20 Btu (th)/(s·ft²·°F) 32636.868769 kcal/(h·ft²·°C) 3.264 × 10⁴
25 Btu (th)/(s·ft²·°F) 40796.085962 kcal/(h·ft²·°C) 4.08 × 10⁴
50 Btu (th)/(s·ft²·°F) 81592.171924 kcal/(h·ft²·°C) 8.159 × 10⁴
100 Btu (th)/(s·ft²·°F) 163184.343847 kcal/(h·ft²·°C) 1.632 × 10⁵
250 Btu (th)/(s·ft²·°F) 407960.859618 kcal/(h·ft²·°C) 4.08 × 10⁵
500 Btu (th)/(s·ft²·°F) 815921.719235 kcal/(h·ft²·°C) 8.159 × 10⁵
1000 Btu (th)/(s·ft²·°F) 1631843.43847 kcal/(h·ft²·°C) 1.632 × 10⁶
Kilocalorie (IT)/hour/square foot/°C to Btu (th)/second/square foot/°F: Reciprocal Summary
Kilocalorie (IT)/hour/square foot/°C to Btu (th)/second/square foot/°F Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 kcal/(h·ft²·°C) 0.000612804 Btu (th)/(s·ft²·°F) 6.128 × 10⁻⁴
5 kcal/(h·ft²·°C) 0.00306402 Btu (th)/(s·ft²·°F) 3.064 × 10⁻³
10 kcal/(h·ft²·°C) 0.00612804 Btu (th)/(s·ft²·°F) 6.128 × 10⁻³
50 kcal/(h·ft²·°C) 0.0306402 Btu (th)/(s·ft²·°F) 3.064 × 10⁻²
100 kcal/(h·ft²·°C) 0.0612804 Btu (th)/(s·ft²·°F) 6.128 × 10⁻²
View Complete 15-Row Kilocalorie (IT)/hour/square foot/°C to Btu (th)/second/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)/second/square foot/°F (Btu (th)/(s·ft²·°F)) and Kilocalorie (IT)/hour/square foot/°C (kcal/(h·ft²·°C)):

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

  • High-pressure steam boiler water-wall tube boiling coefficient 0.5 Btu (th)/(s·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)/second/square foot/°F to Kilocalorie (IT)/hour/square foot/°C

Converting Btu (th)/second/square foot/°F (Btu (th)/(s·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)/second/square foot/°F equals 1631.843438 Kilocalorie (IT)/hour/square foot/°C, while 1 kcal/(h·ft²·°C) equals 0.000612804 Btu (th)/(s·ft²·°F).

Direct Factor1 Btu (th)/(s·ft²·°F) = 1631.843438 kcal/(h·ft²·°C)
Inverse Ratio1 kcal/(h·ft²·°C) = 0.000612804 Btu (th)/(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 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)/(s·ft²·°F) = 20428.174538 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)/second/square foot/°F → Kilocalorie (IT)/hour/square foot/°C:V(kcal/(h·ft²·°C)) = V(Btu (th)/(s·ft²·°F)) × ( 20428.174538 / 12.518465 ) = V(Btu (th)/(s·ft²·°F)) × 1631.843438
Mathematical FormulaValue in Kilocalorie (IT)/hour/square foot/°C = Value in Btu (th)/second/square foot/°F × 1631.84343847Direct computational formula applied for standard conversion.
Worked Example

Evaluating an input of 120 Btu (th)/second/square foot/°F (Btu (th)/(s·ft²·°F)) produces 195821.212616 Kilocalorie (IT)/hour/square foot/°C (kcal/(h·ft²·°C)). In heavy-duty utility and industrial workloads, 2500 Btu (th)/(s·ft²·°F) equals 4079608.596176 kcal/(h·ft²·°C).

Inverse check: 1 kcal/(h·ft²·°C) = 0.000612804 Btu (th)/(s·ft²·°F).

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

Btu (th)/second/square foot/°F

Btu (th)/(s·ft²·°F)
Imperial / US

A Btu (th)/second/square foot/°F (Btu (th)/(s·ft²·°F)) is an imperial and US customary unit for heat transfer coefficient.

Applications & Practical Context

In practical heat transfer coefficient terms, a high-pressure steam boiler water-wall tube boiling coefficient equals 0.5 Btu (th)/(s·ft²·°F).

Physical Setup

A physical magnitude of 1 Btu (th)/(s·ft²·°F) corresponds to 20428.174538 W/(m²·K) in standard SI measurement.

Conversion to SI Unit: watt per square meter kelvin (W/(m²·K))
1 Btu (th)/(s·ft²·°F) = 20428.174538 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)/(s·ft²·°F) at Forced Air Duct Cooling (ΔT = 25 K) = 510704.3635 W/m²
Equals 510.7044 kW/m² • 161892.464 BTU/(h·ft²) • 12.197964 cal/(s·cm²)
SI Heat Flux
510704.3635
W/m²
Watts per Square Meter
Solar / Combustion
510.7044
kW/m²
Kilowatts per Square Meter
US Building Envelope
161892.464
BTU/(h·ft²)
BTU per Hour Sq. Foot
CGS Thermal
12.197964
cal/(s·cm²)
Calories per Second Sq. Cm
Meteorology
732.0096
Ly/min
Langley per Minute
Furnace Flux
0.510704
MW/m²
Megawatts per Square Meter
  1. 1. Normalize Input to SI Base Unit (W/(m²·K)):
    h = 1 Btu (th)/(s·ft²·°F) × 20428.17453832 = 20428.17453832 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 = (20428.17453832 W/(m²·K)) × (25 K) = 510704.363458 W/m²
  4. 4. Convert to Standard Engineering Units:
    • W/m²: 510704.363458 × 1 = 510704.3635 W/m² (Watts per Square Meter) • kW/m²: 510704.363458 × 0.001 = 510.7044 kW/m² (Kilowatts per Square Meter) • BTU/(h·ft²): 510704.363458 × 0.317 = 161892.464 BTU/(h·ft²) (BTU per Hour Sq. Foot) • cal/(s·cm²): 510704.363458 × 2.3885 × 10⁻⁵ = 12.197964 cal/(s·cm²) (Calories per Second Sq. Cm) • Ly/min: 510704.363458 × 0.001433 = 732.0096 Ly/min (Langley per Minute) • MW/m²: 510704.363458 × 1 × 10⁻⁶ = 0.510704 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 1631.84343847 kilocalories (it)/hour/square foot/°c (kcal/(h·ft²·°C)) in 1 btu (th)/second/square foot/°f (Btu (th)/(s·ft²·°F)). To calculate larger amounts manually, simply multiply your total number of btus (th)/second/square foot/°f by the conversion multiplier of 1631.84343847.

The mathematical formula to convert btus (th)/second/square foot/°f to kilocalories (it)/hour/square foot/°c is: [value] * 1631.84343847 = 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)/second/square foot/°f, you must divide your starting value by 1631.84343847. Our bidirectional tool automatically computes this inverse equation the moment you type into the kilocalorie (it)/hour/square foot/°c input field.

1 Btu (th)/second/square foot/°F is larger than 1 Kilocalorie (IT)/hour/square foot/°C. Specifically, 1 Btu (th)/second/square foot/°F equals exactly 1631.84343847 kilocalories (it)/hour/square foot/°c, making it 1631.8434 times larger (a difference of 3.21 orders of magnitude). Therefore, quantities expressed in kilocalories (it)/hour/square foot/°c require a larger numerical value to represent the same physical amount.

Under standard international measurement guidelines, 1 Btu (th)/second/square foot/°F converts to 1631.84343847 kilocalories (it)/hour/square foot/°c. Precise numerical conversion factors ensure consistency across laboratory, engineering, and field data.