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Btus (th)/hour/sq. foot/°F to Calories (it)/second/cm²/°C Converter (Btu (th)/(h·ft²·°F) to cal/(s·cm²·°C))

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Live Conversion • ISO 80000-5:2019 Certified
1 BTU (th)/hour/sq. foot/°F = 0.00013553231 Calorie (IT)/second/cm²/°C
1 Btu (th)/(h·ft²·°F) = 0.000135532 cal/(s·cm²·°C) • 1 cal/(s·cm²·°C) = 7378.314555 Btu (th)/(h·ft²·°F)
BTU (th)/hour/sq. foot/°F to Calorie (IT)/second/cm²/°C: One BTU (th)/hour/sq. foot/°F is equal to 0.00013553231 Calories (it)/second/cm²/°C.
Certified Authority Value
0.00013553
cal/(s·cm²·°C)
Exact: 1 cal/(s·cm²·°C) ≡ 7378.3145552592 Btu (th)/(h·ft²·°F)
Btu (th)/(h·ft²·°F)
Btu (th)/(h·ft²·°F)
Swap to Calorie (IT)/second/cm²/°C to BTU (th)/hour/sq. foot/°F
Swap to Calorie (IT)/second/cm²/°C to BTU (th)/hour/sq. foot/°F
cal/(s·cm²·°C)
cal/(s·cm²·°C) 0.00013553231
Quick Values:
Conversion Formula
To convert BTU (th)/hour/sq. foot/°F to Calorie (IT)/second/cm²/°C, multiply by 0.00013553231
Btu (th)/(h·ft²·°F) × 0.00013553231 = cal/(s·cm²·°C)

Calculation: 1 Btu (th)/(h·ft²·°F) × 0.00013553231 = 0.00013553231 cal/(s·cm²·°C)

Common BTU (th)/hour/sq. foot/°F to Calorie (IT)/second/cm²/°C Calculations

Quick-lookup reference table showing calculated equivalents for standard increments between BTU (th)/hour/sq. foot/°F (Btu (th)/(h·ft²·°F)) and Calorie (IT)/second/cm²/°C (cal/(s·cm²·°C)).

Tap any row to calculate
BTU (th)/hour/sq. foot/°F to Calorie (IT)/second/cm²/°C: Primary Direct Table (15 Steps)
BTU (th)/hour/sq. foot/°F to Calorie (IT)/second/cm²/°C Conversion Reference Table
Conversion & Equivalent Value Scientific Notation
0.001 Btu (th)/(h·ft²·°F) 1.355323 × 10⁻⁷ cal/(s·cm²·°C) 1.355 × 10⁻⁷
0.01 Btu (th)/(h·ft²·°F) 1.355323 × 10⁻⁶ cal/(s·cm²·°C) 1.355 × 10⁻⁶
0.1 Btu (th)/(h·ft²·°F) 1.355323 × 10⁻⁵ cal/(s·cm²·°C) 1.355 × 10⁻⁵
0.5 Btu (th)/(h·ft²·°F) 6.776615 × 10⁻⁵ cal/(s·cm²·°C) 6.777 × 10⁻⁵
1 Btu (th)/(h·ft²·°F) 0.000135532 cal/(s·cm²·°C) 1.355 × 10⁻⁴
2 Btu (th)/(h·ft²·°F) 0.000271065 cal/(s·cm²·°C) 2.711 × 10⁻⁴
5 Btu (th)/(h·ft²·°F) 0.000677662 cal/(s·cm²·°C) 6.777 × 10⁻⁴
10 Btu (th)/(h·ft²·°F) 0.00135532 cal/(s·cm²·°C) 1.355 × 10⁻³
20 Btu (th)/(h·ft²·°F) 0.00271065 cal/(s·cm²·°C) 2.711 × 10⁻³
25 Btu (th)/(h·ft²·°F) 0.00338831 cal/(s·cm²·°C) 3.388 × 10⁻³
50 Btu (th)/(h·ft²·°F) 0.00677662 cal/(s·cm²·°C) 6.777 × 10⁻³
100 Btu (th)/(h·ft²·°F) 0.0135532 cal/(s·cm²·°C) 1.355 × 10⁻²
250 Btu (th)/(h·ft²·°F) 0.0338831 cal/(s·cm²·°C) 3.388 × 10⁻²
500 Btu (th)/(h·ft²·°F) 0.0677662 cal/(s·cm²·°C) 6.777 × 10⁻²
1000 Btu (th)/(h·ft²·°F) 0.135532 cal/(s·cm²·°C) 1.355 × 10⁻¹
Calorie (IT)/second/cm²/°C to BTU (th)/hour/sq. foot/°F: Reciprocal Summary
Calorie (IT)/second/cm²/°C to BTU (th)/hour/sq. foot/°F Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 cal/(s·cm²·°C) 7378.314555 Btu (th)/(h·ft²·°F) 7.378 × 10³
5 cal/(s·cm²·°C) 36891.572776 Btu (th)/(h·ft²·°F) 3.689 × 10⁴
10 cal/(s·cm²·°C) 73783.145553 Btu (th)/(h·ft²·°F) 7.378 × 10⁴
50 cal/(s·cm²·°C) 368915.727763 Btu (th)/(h·ft²·°F) 3.689 × 10⁵
100 cal/(s·cm²·°C) 737831.455526 Btu (th)/(h·ft²·°F) 7.378 × 10⁵
View Complete 15-Row Calorie (IT)/second/cm²/°C to BTU (th)/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 (th)/hour/sq. foot/°F (Btu (th)/(h·ft²·°F)) and Calorie (IT)/second/cm²/°C (cal/(s·cm²·°C)):

BTU (th)/hour/sq. foot/°F References:

  • Stationary ambient air natural free convection on vertical wall 0.88114 Btu (th)/(h·ft²·°F)
  • Forced air breeze blowing across automotive cooling radiator 8.8114 Btu (th)/(h·ft²·°F)
  • Liquid water forced circulation inside heat exchanger pipe 528.68 Btu (th)/(h·ft²·°F)
  • Nucleate boiling heat transfer in pressurized steam boiler tube 2643.42 Btu (th)/(h·ft²·°F)

Calorie (IT)/second/cm²/°C References:

  • Stationary ambient air natural free convection on vertical wall 0.000119 cal/(s·cm²·°C)
  • Forced air breeze blowing across automotive cooling radiator 0.001194 cal/(s·cm²·°C)
  • Liquid water forced circulation inside heat exchanger pipe 0.071654 cal/(s·cm²·°C)
  • Nucleate boiling heat transfer in pressurized steam boiler tube 0.358269 cal/(s·cm²·°C)

Tap any benchmark above to automatically calculate its exact equivalent in Calorie (IT)/second/cm²/°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)/hour/sq. foot/°F to Calorie (IT)/second/cm²/°C

Converting BTU (th)/hour/sq. foot/°F (Btu (th)/(h·ft²·°F)) to Calorie (IT)/second/cm²/°C (cal/(s·cm²·°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)/hour/sq. foot/°F equals 0.000135532 Calorie (IT)/second/cm²/°C, while 1 cal/(s·cm²·°C) equals 7378.314555 Btu (th)/(h·ft²·°F).

Direct Factor1 Btu (th)/(h·ft²·°F) = 0.000135532 cal/(s·cm²·°C)
Inverse Ratio1 cal/(s·cm²·°C) = 7378.314555 Btu (th)/(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 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)/(h·ft²·°F) = 5.674467 watt per square meter kelvin (W/(m²·K))
2. Target SI Bridge (ktarget):1 cal/(s·cm²·°C) = 41868 watt per square meter kelvin (W/(m²·K))
Step-by-step substitution for BTU (th)/hour/sq. foot/°F → Calorie (IT)/second/cm²/°C:V(cal/(s·cm²·°C)) = V(Btu (th)/(h·ft²·°F)) × ( 5.674467 / 41868 ) = V(Btu (th)/(h·ft²·°F)) × 0.000135532
Mathematical FormulaValue in Calorie (IT)/second/cm²/°C = Value in BTU (th)/hour/sq. foot/°F × 0.00013553231Direct computational formula applied for standard conversion.
Worked Example

Converting 36 Btu (th)/(h·ft²·°F) yields an exact output of 0.00487916 cal/(s·cm²·°C) in Calorie (IT)/second/cm²/°C. Under higher industrial throughput, 240 Btu (th)/(h·ft²·°F) translates to 0.0325278 cal/(s·cm²·°C).

Inverse check: 1 cal/(s·cm²·°C) = 7378.314555 Btu (th)/(h·ft²·°F).

Understanding BTU (th)/hour/sq. foot/°F and Calorie (IT)/second/cm²/°C

BTU (th)/hour/sq. foot/°F

Btu (th)/(h·ft²·°F)
Imperial / US

A BTU (th)/hour/sq. foot/°F (Btu (th)/(h·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 0.88114 Btu (th)/(h·ft²·°F), a forced air breeze blowing across automotive cooling radiator equals 8.8114 Btu (th)/(h·ft²·°F), a liquid water forced circulation inside heat exchanger pipe equals 528.68 Btu (th)/(h·ft²·°F).

Physical Setup

A physical magnitude of 1 Btu (th)/(h·ft²·°F) corresponds to 5.674467 W/(m²·K) in standard SI measurement.

Conversion to SI Unit: watt per square meter kelvin (W/(m²·K))
1 Btu (th)/(h·ft²·°F) = 5.674467 W/(m²·K)

Calorie (IT)/second/cm²/°C

cal/(s·cm²·°C)
Standard Unit

A Calorie (IT)/second/cm²/°C (cal/(s·cm²·°C)) is a recognized 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 0.000119 cal/(s·cm²·°C), a forced air breeze blowing across automotive cooling radiator equals 0.001194 cal/(s·cm²·°C), a liquid water forced circulation inside heat exchanger pipe equals 0.071654 cal/(s·cm²·°C).

Physical Setup

A physical magnitude of 1 cal/(s·cm²·°C) corresponds to 41868 W/(m²·K) in standard SI measurement.

Conversion to SI Unit: watt per square meter kelvin (W/(m²·K))
1 cal/(s·cm²·°C) = 41868 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)/(h·ft²·°F) at Forced Air Duct Cooling (ΔT = 25 K) = 141.8617 W/m²
Equals 0.1419 kW/m² • 44.9699 BTU/(h·ft²) • 0.00338831 cal/(s·cm²)
SI Heat Flux
141.8617
W/m²
Watts per Square Meter
Solar / Combustion
0.1419
kW/m²
Kilowatts per Square Meter
US Building Envelope
44.9699
BTU/(h·ft²)
BTU per Hour Sq. Foot
CGS Thermal
0.00338831
cal/(s·cm²)
Calories per Second Sq. Cm
Meteorology
0.2033
Ly/min
Langley per Minute
Furnace Flux
0.00014186
MW/m²
Megawatts per Square Meter
  1. 1. Normalize Input to SI Base Unit (W/(m²·K)):
    h = 1 Btu (th)/(h·ft²·°F) × 5.67446667 = 5.67446667 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 = (5.67446667 W/(m²·K)) × (25 K) = 141.861667 W/m²
  4. 4. Convert to Standard Engineering Units:
    • W/m²: 141.861667 × 1 = 141.8617 W/m² (Watts per Square Meter) • kW/m²: 141.861667 × 0.001 = 0.1419 kW/m² (Kilowatts per Square Meter) • BTU/(h·ft²): 141.861667 × 0.317 = 44.9699 BTU/(h·ft²) (BTU per Hour Sq. Foot) • cal/(s·cm²): 141.861667 × 2.3885 × 10⁻⁵ = 0.00338831 cal/(s·cm²) (Calories per Second Sq. Cm) • Ly/min: 141.861667 × 0.001433 = 0.2033 Ly/min (Langley per Minute) • MW/m²: 141.861667 × 1 × 10⁻⁶ = 0.00014186 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 0.00013553231 calories (it)/second/cm²/°c (cal/(s·cm²·°C)) in 1 btu (th)/hour/sq. foot/°f (Btu (th)/(h·ft²·°F)). To calculate larger amounts manually, simply multiply your total number of btus (th)/hour/sq. foot/°f by the conversion multiplier of 0.00013553231.

The mathematical formula to convert btus (th)/hour/sq. foot/°f to calories (it)/second/cm²/°c is: [value] * 0.00013553231 = calories (it)/second/cm²/°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 (it)/second/cm²/°c back to btus (th)/hour/sq. foot/°f, you must divide your starting value by 0.00013553231. Our bidirectional tool automatically computes this inverse equation the moment you type into the calorie (it)/second/cm²/°c input field.

1 Calorie (IT)/second/cm²/°C is larger than 1 BTU (th)/hour/sq. foot/°F. Specifically, 1 BTU (th)/hour/sq. foot/°F equals 0.00013553231 calories (it)/second/cm²/°c, meaning 1 Calorie (IT)/second/cm²/°C is 7378.3146 times larger than 1 BTU (th)/hour/sq. foot/°F (a difference of 3.87 orders of magnitude). Expressing measurements in btus (th)/hour/sq. foot/°f requires a larger numerical value to represent the equivalent physical magnitude.

Under standard international measurement guidelines, 1 BTU (th)/hour/sq. foot/°F converts to 0.00013553231 calories (it)/second/cm²/°c. Precise numerical conversion factors ensure consistency across laboratory, engineering, and field data.