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

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Live Conversion • ISO 80000-5:2019 Certified
1 Kilocalorie (IT)/hour/square foot/°C = 0.00061280389 Btu (th)/second/square foot/°F
1 kcal/(h·ft²·°C) = 0.000612804 Btu (th)/(s·ft²·°F) • 1 Btu (th)/(s·ft²·°F) = 1631.843438 kcal/(h·ft²·°C)
Kilocalorie (IT)/hour/square foot/°C to Btu (th)/second/square foot/°F: One Kilocalorie (IT)/hour/square foot/°C is equal to 0.00061280389 Btus (th)/second/square foot/°F.
Certified Authority Value
0.00061280
Btu (th)/(s·ft²·°F)
Exact: 1 Btu (th)/(s·ft²·°F) ≡ 1631.8434384703 kcal/(h·ft²·°C)
kcal/(h·ft²·°C)
kcal/(h·ft²·°C)
Swap to Btu (th)/second/square foot/°F to Kilocalorie (IT)/hour/square foot/°C
Swap to Btu (th)/second/square foot/°F to Kilocalorie (IT)/hour/square foot/°C
Btu (th)/(s·ft²·°F)
Btu (th)/(s·ft²·°F) 0.00061280389
Quick Values:
Conversion Formula
To convert Kilocalorie (IT)/hour/square foot/°C to Btu (th)/second/square foot/°F, multiply by 0.00061280389
kcal/(h·ft²·°C) × 0.00061280389 = Btu (th)/(s·ft²·°F)

Calculation: 1 kcal/(h·ft²·°C) × 0.00061280389 = 0.00061280389 Btu (th)/(s·ft²·°F)

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

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

Tap any row to calculate
Kilocalorie (IT)/hour/square foot/°C to Btu (th)/second/square foot/°F: Primary Direct Table (15 Steps)
Kilocalorie (IT)/hour/square foot/°C to Btu (th)/second/square foot/°F Conversion Reference Table
Conversion & Equivalent Value Scientific Notation
0.001 kcal/(h·ft²·°C) 6.128039 × 10⁻⁷ Btu (th)/(s·ft²·°F) 6.128 × 10⁻⁷
0.01 kcal/(h·ft²·°C) 6.128039 × 10⁻⁶ Btu (th)/(s·ft²·°F) 6.128 × 10⁻⁶
0.1 kcal/(h·ft²·°C) 6.128039 × 10⁻⁵ Btu (th)/(s·ft²·°F) 6.128 × 10⁻⁵
0.5 kcal/(h·ft²·°C) 0.000306402 Btu (th)/(s·ft²·°F) 3.064 × 10⁻⁴
1 kcal/(h·ft²·°C) 0.000612804 Btu (th)/(s·ft²·°F) 6.128 × 10⁻⁴
2 kcal/(h·ft²·°C) 0.00122561 Btu (th)/(s·ft²·°F) 1.226 × 10⁻³
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
20 kcal/(h·ft²·°C) 0.0122561 Btu (th)/(s·ft²·°F) 1.226 × 10⁻²
25 kcal/(h·ft²·°C) 0.0153201 Btu (th)/(s·ft²·°F) 1.532 × 10⁻²
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
250 kcal/(h·ft²·°C) 0.153201 Btu (th)/(s·ft²·°F) 1.532 × 10⁻¹
500 kcal/(h·ft²·°C) 0.306402 Btu (th)/(s·ft²·°F) 3.064 × 10⁻¹
1000 kcal/(h·ft²·°C) 0.612804 Btu (th)/(s·ft²·°F) 6.128 × 10⁻¹
Btu (th)/second/square foot/°F to Kilocalorie (IT)/hour/square foot/°C: Reciprocal Summary
Btu (th)/second/square foot/°F to Kilocalorie (IT)/hour/square foot/°C Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 Btu (th)/(s·ft²·°F) 1631.843438 kcal/(h·ft²·°C) 1.632 × 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
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
View Complete 15-Row Btu (th)/second/square foot/°F to Kilocalorie (IT)/hour/square foot/°C 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 Kilocalorie (IT)/hour/square foot/°C (kcal/(h·ft²·°C)) and Btu (th)/second/square foot/°F (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)

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

  • High-pressure steam boiler water-wall tube boiling coefficient 0.5 Btu (th)/(s·ft²·°F)

Tap any benchmark above to automatically calculate its exact equivalent in Btu (th)/second/square foot/°F.

ISQ Dimension: [M T⁻³ Θ⁻¹] Coherent SI Unit: watt per square meter kelvin (W/(m²·K)) Thermodynamics & Heat Transfer

How to Convert Kilocalorie (IT)/hour/square foot/°C to Btu (th)/second/square foot/°F

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

Direct Factor1 kcal/(h·ft²·°C) = 0.000612804 Btu (th)/(s·ft²·°F)
Inverse Ratio1 Btu (th)/(s·ft²·°F) = 1631.843438 kcal/(h·ft²·°C)
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 kcal/(h·ft²·°C) = 12.518465 watt per square meter kelvin (W/(m²·K))
2. Target SI Bridge (ktarget):1 Btu (th)/(s·ft²·°F) = 20428.174538 watt per square meter kelvin (W/(m²·K))
Step-by-step substitution for Kilocalorie (IT)/hour/square foot/°C → Btu (th)/second/square foot/°F:V(Btu (th)/(s·ft²·°F)) = V(kcal/(h·ft²·°C)) × ( 12.518465 / 20428.174538 ) = V(kcal/(h·ft²·°C)) × 0.000612804
Mathematical FormulaValue in Btu (th)/second/square foot/°F = Value in Kilocalorie (IT)/hour/square foot/°C × 0.00061280389Direct computational formula applied for standard conversion.
Worked Example

Evaluating an input of 2.5 Kilocalorie (IT)/hour/square foot/°C (kcal/(h·ft²·°C)) produces 0.00153201 Btu (th)/second/square foot/°F (Btu (th)/(s·ft²·°F)). In heavy-duty utility and industrial workloads, 5000 kcal/(h·ft²·°C) equals 3.064019 Btu (th)/(s·ft²·°F).

Inverse check: 1 Btu (th)/(s·ft²·°F) = 1631.843438 kcal/(h·ft²·°C).

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

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)

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)

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 kcal/(h·ft²·°C) at Forced Air Duct Cooling (ΔT = 25 K) = 312.9616 W/m²
Equals 0.313 kW/m² • 99.2083 BTU/(h·ft²) • 0.00747496 cal/(s·cm²)
SI Heat Flux
312.9616
W/m²
Watts per Square Meter
Solar / Combustion
0.313
kW/m²
Kilowatts per Square Meter
US Building Envelope
99.2083
BTU/(h·ft²)
BTU per Hour Sq. Foot
CGS Thermal
0.00747496
cal/(s·cm²)
Calories per Second Sq. Cm
Meteorology
0.4486
Ly/min
Langley per Minute
Furnace Flux
0.00031296
MW/m²
Megawatts per Square Meter
  1. 1. Normalize Input to SI Base Unit (W/(m²·K)):
    h = 1 kcal/(h·ft²·°C) × 12.51846474 = 12.51846474 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 = (12.51846474 W/(m²·K)) × (25 K) = 312.961618 W/m²
  4. 4. Convert to Standard Engineering Units:
    • W/m²: 312.961618 × 1 = 312.9616 W/m² (Watts per Square Meter) • kW/m²: 312.961618 × 0.001 = 0.313 kW/m² (Kilowatts per Square Meter) • BTU/(h·ft²): 312.961618 × 0.317 = 99.2083 BTU/(h·ft²) (BTU per Hour Sq. Foot) • cal/(s·cm²): 312.961618 × 2.3885 × 10⁻⁵ = 0.00747496 cal/(s·cm²) (Calories per Second Sq. Cm) • Ly/min: 312.961618 × 0.001433 = 0.4486 Ly/min (Langley per Minute) • MW/m²: 312.961618 × 1 × 10⁻⁶ = 0.00031296 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 0.00061280389 btus (th)/second/square foot/°f (Btu (th)/(s·ft²·°F)) in 1 kilocalorie (it)/hour/square foot/°c (kcal/(h·ft²·°C)). To calculate larger amounts manually, simply multiply your total number of kilocalories (it)/hour/square foot/°c by the conversion multiplier of 0.00061280389.

The mathematical formula to convert kilocalories (it)/hour/square foot/°c to btus (th)/second/square foot/°f is: [value] * 0.00061280389 = btus (th)/second/square foot/°f. 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 btus (th)/second/square foot/°f back to kilocalories (it)/hour/square foot/°c, you must divide your starting value by 0.00061280389. Our bidirectional tool automatically computes this inverse equation the moment you type into the btu (th)/second/square foot/°f input field.

1 Btu (th)/second/square foot/°F is larger than 1 Kilocalorie (IT)/hour/square foot/°C. Specifically, 1 Kilocalorie (IT)/hour/square foot/°C equals 0.00061280389 btus (th)/second/square foot/°f, meaning 1 Btu (th)/second/square foot/°F is 1631.8434 times larger than 1 Kilocalorie (IT)/hour/square foot/°C (a difference of 3.21 orders of magnitude). Expressing measurements in kilocalories (it)/hour/square foot/°c requires a larger numerical value to represent the equivalent physical magnitude.

Under standard international measurement guidelines, 1 Kilocalorie (IT)/hour/square foot/°C converts to 0.00061280389 btus (th)/second/square foot/°f. Precise numerical conversion factors ensure consistency across laboratory, engineering, and field data.