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Btus (th)/second/sq. foot/°F to Kilocalories (it)/hour/m²/°C Converter (Btu (th)/(s·ft²·°F) to kcal/(h·m²·°C))

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Live Conversion • ISO 80000-5:2019 Certified
1 BTU (th)/second/sq. foot/°F = 17564.98653322 Kilocalorie (IT)/hour/m²/°C
1 Btu (th)/(s·ft²·°F) = 17564.986533 kcal/(h·m²·°C) • 1 kcal/(h·m²·°C) = 5.693144 × 10⁻⁵ Btu (th)/(s·ft²·°F)
BTU (th)/second/sq. foot/°F to Kilocalorie (IT)/hour/m²/°C: One BTU (th)/second/sq. foot/°F is equal to 17564.98653322 Kilocalories (it)/hour/m²/°C.
Certified Authority Value
17564.98653322
kcal/(h·m²·°C)
Exact: 1 kcal/(h·m²·°C) ≡ 5.6931441314 × 10⁻⁵ Btu (th)/(s·ft²·°F)
Btu (th)/(s·ft²·°F)
Btu (th)/(s·ft²·°F)
Swap to Kilocalorie (IT)/hour/m²/°C to BTU (th)/second/sq. foot/°F
Swap to Kilocalorie (IT)/hour/m²/°C to BTU (th)/second/sq. foot/°F
kcal/(h·m²·°C)
kcal/(h·m²·°C) 17564.98653322
Quick Values:
Conversion Formula
To convert BTU (th)/second/sq. foot/°F to Kilocalorie (IT)/hour/m²/°C, multiply by 17564.98653322
Btu (th)/(s·ft²·°F) × 17564.98653322 = kcal/(h·m²·°C)

Calculation: 1 Btu (th)/(s·ft²·°F) × 17564.98653322 = 17564.98653322 kcal/(h·m²·°C)

Common BTU (th)/second/sq. foot/°F to Kilocalorie (IT)/hour/m²/°C Calculations

Quick-lookup reference table showing calculated equivalents for standard increments between BTU (th)/second/sq. foot/°F (Btu (th)/(s·ft²·°F)) and Kilocalorie (IT)/hour/m²/°C (kcal/(h·m²·°C)).

Tap any row to calculate
BTU (th)/second/sq. foot/°F to Kilocalorie (IT)/hour/m²/°C: Primary Direct Table (15 Steps)
BTU (th)/second/sq. foot/°F to Kilocalorie (IT)/hour/m²/°C Conversion Reference Table
Conversion & Equivalent Value Scientific Notation
0.001 Btu (th)/(s·ft²·°F) 17.564987 kcal/(h·m²·°C) 1.756 × 10¹
0.01 Btu (th)/(s·ft²·°F) 175.649865 kcal/(h·m²·°C) 1.756 × 10²
0.1 Btu (th)/(s·ft²·°F) 1756.498653 kcal/(h·m²·°C) 1.756 × 10³
0.5 Btu (th)/(s·ft²·°F) 8782.493267 kcal/(h·m²·°C) 8.782 × 10³
1 Btu (th)/(s·ft²·°F) 17564.986533 kcal/(h·m²·°C) 1.756 × 10⁴
2 Btu (th)/(s·ft²·°F) 35129.973066 kcal/(h·m²·°C) 3.513 × 10⁴
5 Btu (th)/(s·ft²·°F) 87824.932666 kcal/(h·m²·°C) 8.782 × 10⁴
10 Btu (th)/(s·ft²·°F) 175649.865332 kcal/(h·m²·°C) 1.756 × 10⁵
20 Btu (th)/(s·ft²·°F) 351299.730664 kcal/(h·m²·°C) 3.513 × 10⁵
25 Btu (th)/(s·ft²·°F) 439124.66333 kcal/(h·m²·°C) 4.391 × 10⁵
50 Btu (th)/(s·ft²·°F) 878249.326661 kcal/(h·m²·°C) 8.782 × 10⁵
100 Btu (th)/(s·ft²·°F) 1756498.653322 kcal/(h·m²·°C) 1.756 × 10⁶
250 Btu (th)/(s·ft²·°F) 4391246.633304 kcal/(h·m²·°C) 4.391 × 10⁶
500 Btu (th)/(s·ft²·°F) 8782493.266608 kcal/(h·m²·°C) 8.782 × 10⁶
1000 Btu (th)/(s·ft²·°F) 1.756499 × 10⁷ kcal/(h·m²·°C) 1.756 × 10⁷
Kilocalorie (IT)/hour/m²/°C to BTU (th)/second/sq. foot/°F: Reciprocal Summary
Kilocalorie (IT)/hour/m²/°C to BTU (th)/second/sq. foot/°F Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 kcal/(h·m²·°C) 5.693144 × 10⁻⁵ Btu (th)/(s·ft²·°F) 5.693 × 10⁻⁵
5 kcal/(h·m²·°C) 0.000284657 Btu (th)/(s·ft²·°F) 2.847 × 10⁻⁴
10 kcal/(h·m²·°C) 0.000569314 Btu (th)/(s·ft²·°F) 5.693 × 10⁻⁴
50 kcal/(h·m²·°C) 0.00284657 Btu (th)/(s·ft²·°F) 2.847 × 10⁻³
100 kcal/(h·m²·°C) 0.00569314 Btu (th)/(s·ft²·°F) 5.693 × 10⁻³
View Complete 15-Row Kilocalorie (IT)/hour/m²/°C to BTU (th)/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)/second/sq. foot/°F (Btu (th)/(s·ft²·°F)) and Kilocalorie (IT)/hour/m²/°C (kcal/(h·m²·°C)):

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

  • Stationary ambient air natural free convection on vertical wall 0.000245 Btu (th)/(s·ft²·°F)
  • Forced air breeze blowing across automotive cooling radiator 0.002448 Btu (th)/(s·ft²·°F)
  • Liquid water forced circulation inside heat exchanger pipe 0.146857 Btu (th)/(s·ft²·°F)
  • Nucleate boiling heat transfer in pressurized steam boiler tube 0.734283 Btu (th)/(s·ft²·°F)

Kilocalorie (IT)/hour/m²/°C References:

  • Stationary ambient air natural free convection on vertical wall 4.2992 kcal/(h·m²·°C)
  • Forced air breeze blowing across automotive cooling radiator 42.9923 kcal/(h·m²·°C)
  • Liquid water forced circulation inside heat exchanger pipe 2579.54 kcal/(h·m²·°C)
  • Nucleate boiling heat transfer in pressurized steam boiler tube 12897.68 kcal/(h·m²·°C)

Tap any benchmark above to automatically calculate its exact equivalent in Kilocalorie (IT)/hour/m²/°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/sq. foot/°F to Kilocalorie (IT)/hour/m²/°C

Converting BTU (th)/second/sq. foot/°F (Btu (th)/(s·ft²·°F)) to Kilocalorie (IT)/hour/m²/°C (kcal/(h·m²·°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/sq. foot/°F equals 17564.986533 Kilocalorie (IT)/hour/m²/°C, while 1 kcal/(h·m²·°C) equals 5.693144 × 10⁻⁵ Btu (th)/(s·ft²·°F).

Direct Factor1 Btu (th)/(s·ft²·°F) = 17564.986533 kcal/(h·m²·°C)
Inverse Ratio1 kcal/(h·m²·°C) = 5.693144 × 10⁻⁵ 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) = 20428.08 watt per square meter kelvin (W/(m²·K))
2. Target SI Bridge (ktarget):1 kcal/(h·m²·°C) = 1.163 watt per square meter kelvin (W/(m²·K))
Step-by-step substitution for BTU (th)/second/sq. foot/°F → Kilocalorie (IT)/hour/m²/°C:V(kcal/(h·m²·°C)) = V(Btu (th)/(s·ft²·°F)) × ( 20428.08 / 1.163 ) = V(Btu (th)/(s·ft²·°F)) × 17564.986533
Mathematical FormulaValue in Kilocalorie (IT)/hour/m²/°C = Value in BTU (th)/second/sq. foot/°F × 17564.98653322Direct computational formula applied for standard conversion.
Worked Example

For an engineering input of 250 Btu (th)/(s·ft²·°F), applying the conversion factor yields exactly 4391246.633304 kcal/(h·m²·°C). At larger operational scale, 10000 BTU (th)/second/sq. foot/°F corresponds to 1.756499 × 10⁸ kcal/(h·m²·°C).

Inverse check: 1 kcal/(h·m²·°C) = 5.693144 × 10⁻⁵ Btu (th)/(s·ft²·°F).

Understanding BTU (th)/second/sq. foot/°F and Kilocalorie (IT)/hour/m²/°C

BTU (th)/second/sq. foot/°F

Btu (th)/(s·ft²·°F)
Imperial / US

A BTU (th)/second/sq. 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 stationary ambient air natural free convection on vertical wall equals 0.000245 Btu (th)/(s·ft²·°F), a forced air breeze blowing across automotive cooling radiator equals 0.002448 Btu (th)/(s·ft²·°F), a liquid water forced circulation inside heat exchanger pipe equals 0.146857 Btu (th)/(s·ft²·°F).

Physical Setup

A physical magnitude of 1 Btu (th)/(s·ft²·°F) corresponds to 20428.08 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) = 20428.08 W/(m²·K)

Kilocalorie (IT)/hour/m²/°C

kcal/(h·m²·°C)
SI Multiple

A Kilocalorie (IT)/hour/m²/°C (kcal/(h·m²·°C)) is a decimal multiple of the SI-derived unit for heat transfer coefficient.

Applications & Practical Context

In practical heat transfer coefficient terms, a stationary ambient air natural free convection on vertical wall equals 4.2992 kcal/(h·m²·°C), a forced air breeze blowing across automotive cooling radiator equals 42.9923 kcal/(h·m²·°C), a liquid water forced circulation inside heat exchanger pipe equals 2579.54 kcal/(h·m²·°C).

Physical Setup

A physical magnitude of 1 kcal/(h·m²·°C) corresponds to 1.163 W/(m²·K) in standard SI measurement.

Conversion to SI Unit: watt per square meter kelvin (W/(m²·K))
1 kcal/(h·m²·°C) = 1.163 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) = 510702 W/m²
Equals 510.702 kW/m² • 161891.7148 BTU/(h·ft²) • 12.197908 cal/(s·cm²)
SI Heat Flux
510702
W/m²
Watts per Square Meter
Solar / Combustion
510.702
kW/m²
Kilowatts per Square Meter
US Building Envelope
161891.7148
BTU/(h·ft²)
BTU per Hour Sq. Foot
CGS Thermal
12.197908
cal/(s·cm²)
Calories per Second Sq. Cm
Meteorology
732.0062
Ly/min
Langley per Minute
Furnace Flux
0.510702
MW/m²
Megawatts per Square Meter
  1. 1. Normalize Input to SI Base Unit (W/(m²·K)):
    h = 1 Btu (th)/(s·ft²·°F) × 20428.08 = 20428.08 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 = (20428.08 W/(m²·K)) × (25 K) = 510702 W/m²
  4. 4. Convert to Standard Engineering Units:
    • W/m²: 510702 × 1 = 510702 W/m² (Watts per Square Meter) • kW/m²: 510702 × 0.001 = 510.702 kW/m² (Kilowatts per Square Meter) • BTU/(h·ft²): 510702 × 0.317 = 161891.7148 BTU/(h·ft²) (BTU per Hour Sq. Foot) • cal/(s·cm²): 510702 × 2.3885 × 10⁻⁵ = 12.197908 cal/(s·cm²) (Calories per Second Sq. Cm) • Ly/min: 510702 × 0.001433 = 732.0062 Ly/min (Langley per Minute) • MW/m²: 510702 × 1 × 10⁻⁶ = 0.510702 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 17564.98653322 kilocalories (it)/hour/m²/°c (kcal/(h·m²·°C)) in 1 btu (th)/second/sq. foot/°f (Btu (th)/(s·ft²·°F)). To calculate larger amounts manually, simply multiply your total number of btus (th)/second/sq. foot/°f by the conversion multiplier of 17564.98653322.

The mathematical formula to convert btus (th)/second/sq. foot/°f to kilocalories (it)/hour/m²/°c is: [value] * 17564.98653322 = kilocalories (it)/hour/m²/°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/m²/°c back to btus (th)/second/sq. foot/°f, you must divide your starting value by 17564.98653322. Our bidirectional tool automatically computes this inverse equation the moment you type into the kilocalorie (it)/hour/m²/°c input field.

1 BTU (th)/second/sq. foot/°F is larger than 1 Kilocalorie (IT)/hour/m²/°C. Specifically, 1 BTU (th)/second/sq. foot/°F equals exactly 17564.98653322 kilocalories (it)/hour/m²/°c, making it 17564.9865 times larger (a difference of 4.24 orders of magnitude). Therefore, quantities expressed in kilocalories (it)/hour/m²/°c require a larger numerical value to represent the same physical amount.

Under standard international measurement guidelines, 1 BTU (th)/second/sq. foot/°F converts to 17564.98653322 kilocalories (it)/hour/m²/°c. Precise numerical conversion factors ensure consistency across laboratory, engineering, and field data.