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Btus (IT)/hour/square foot to Calories (th)/hour/square centimeter Converter (Btu/(h·ft²) to cal (th)/(h·cm²))

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Live Conversion • ISO 80000-5:2019 Certified
1 Btu (IT)/hour/square foot = 0.27142761 Calorie (th)/hour/square centimeter
1 Btu/(h·ft²) = 0.271428 cal (th)/(h·cm²) • 1 cal (th)/(h·cm²) = 3.684224 Btu/(h·ft²)
Btu (IT)/hour/square foot to Calorie (th)/hour/square centimeter: One Btu (IT)/hour/square foot is equal to 0.27142761 Calories (th)/hour/square centimeter.
Certified Authority Value
0.27142761
cal (th)/(h·cm²)
Exact: 1 cal (th)/(h·cm²) ≡ 3.6842235444 Btu/(h·ft²)
Btu/(h·ft²)
Btu/(h·ft²)
Swap to Calorie (th)/hour/square centimeter to Btu (IT)/hour/square foot
Swap to Calorie (th)/hour/square centimeter to Btu (IT)/hour/square foot
cal (th)/(h·cm²)
cal (th)/(h·cm²) 0.27142761
Quick Values:
Conversion Formula
To convert Btu (IT)/hour/square foot to Calorie (th)/hour/square centimeter, multiply by 0.27142761
Btu/(h·ft²) × 0.27142761 = cal (th)/(h·cm²)

Calculation: 1 Btu/(h·ft²) × 0.27142761 = 0.27142761 cal (th)/(h·cm²)

Common Btu (IT)/hour/square foot to Calorie (th)/hour/square centimeter Calculations

Quick-lookup reference table showing calculated equivalents for standard increments between Btu (IT)/hour/square foot (Btu/(h·ft²)) and Calorie (th)/hour/square centimeter (cal (th)/(h·cm²)).

Tap any row to calculate
Btu (IT)/hour/square foot to Calorie (th)/hour/square centimeter: Primary Direct Table (15 Steps)
Btu (IT)/hour/square foot to Calorie (th)/hour/square centimeter Conversion Reference Table
Conversion & Equivalent Value Scientific Notation
0.001 Btu/(h·ft²) 0.000271428 cal (th)/(h·cm²) 2.714 × 10⁻⁴
0.01 Btu/(h·ft²) 0.00271428 cal (th)/(h·cm²) 2.714 × 10⁻³
0.1 Btu/(h·ft²) 0.0271428 cal (th)/(h·cm²) 2.714 × 10⁻²
0.5 Btu/(h·ft²) 0.135714 cal (th)/(h·cm²) 1.357 × 10⁻¹
1 Btu/(h·ft²) 0.271428 cal (th)/(h·cm²) 2.714 × 10⁻¹
2 Btu/(h·ft²) 0.542855 cal (th)/(h·cm²) 5.429 × 10⁻¹
5 Btu/(h·ft²) 1.357138 cal (th)/(h·cm²) 1.357 × 10⁰
10 Btu/(h·ft²) 2.714276 cal (th)/(h·cm²) 2.714 × 10⁰
20 Btu/(h·ft²) 5.428552 cal (th)/(h·cm²) 5.429 × 10⁰
25 Btu/(h·ft²) 6.78569 cal (th)/(h·cm²) 6.786 × 10⁰
50 Btu/(h·ft²) 13.571381 cal (th)/(h·cm²) 1.357 × 10¹
100 Btu/(h·ft²) 27.142761 cal (th)/(h·cm²) 2.714 × 10¹
250 Btu/(h·ft²) 67.856903 cal (th)/(h·cm²) 6.786 × 10¹
500 Btu/(h·ft²) 135.713806 cal (th)/(h·cm²) 1.357 × 10²
1000 Btu/(h·ft²) 271.427612 cal (th)/(h·cm²) 2.714 × 10²
Calorie (th)/hour/square centimeter to Btu (IT)/hour/square foot: Reciprocal Summary
Calorie (th)/hour/square centimeter to Btu (IT)/hour/square foot Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 cal (th)/(h·cm²) 3.684224 Btu/(h·ft²) 3.684 × 10⁰
5 cal (th)/(h·cm²) 18.421118 Btu/(h·ft²) 1.842 × 10¹
10 cal (th)/(h·cm²) 36.842235 Btu/(h·ft²) 3.684 × 10¹
50 cal (th)/(h·cm²) 184.211177 Btu/(h·ft²) 1.842 × 10²
100 cal (th)/(h·cm²) 368.422354 Btu/(h·ft²) 3.684 × 10²
View Complete 15-Row Calorie (th)/hour/square centimeter to Btu (IT)/hour/square foot 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 (IT)/hour/square foot (Btu/(h·ft²)) and Calorie (th)/hour/square centimeter (cal (th)/(h·cm²)):

Btu (IT)/hour/square foot References:

  • Direct summer sunshine striking asphalt shingle roof surface 300 Btu/(h·ft²)
  • Residential cast iron steam heating radiator surface heat flux 240 Btu/(h·ft²)

Calorie (th)/hour/square centimeter References:

  • Glass greenhouse passive solar heating transmission flux 60 cal (th)/(h·cm²)

Tap any benchmark above to automatically calculate its exact equivalent in Calorie (th)/hour/square centimeter.

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

How to Convert Btu (IT)/hour/square foot to Calorie (th)/hour/square centimeter

Converting Btu (IT)/hour/square foot (Btu/(h·ft²)) to Calorie (th)/hour/square centimeter (cal (th)/(h·cm²)) is a core calculation in Heat Flux Density, which measures the rate of thermal energy transfer radiating or conducting through a unit area per second. 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 (IT)/hour/square foot equals 0.271428 Calorie (th)/hour/square centimeter, while 1 cal (th)/(h·cm²) equals 3.684224 Btu/(h·ft²).

Direct Factor1 Btu/(h·ft²) = 0.271428 cal (th)/(h·cm²)
Inverse Ratio1 cal (th)/(h·cm²) = 3.684224 Btu/(h·ft²)
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 (W/m²)) 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/(h·ft²) = 3.154591 watt per square meter (W/m²)
2. Target SI Bridge (ktarget):1 cal (th)/(h·cm²) = 11.622217 watt per square meter (W/m²)
Step-by-step substitution for Btu (IT)/hour/square foot → Calorie (th)/hour/square centimeter:V(cal (th)/(h·cm²)) = V(Btu/(h·ft²)) × ( 3.154591 / 11.622217 ) = V(Btu/(h·ft²)) × 0.271428
Mathematical FormulaValue in Calorie (th)/hour/square centimeter = Value in Btu (IT)/hour/square foot × 0.27142761Direct computational formula applied for standard conversion.
Worked Example

For an engineering input of 250 Btu/(h·ft²), applying the conversion factor yields exactly 67.856903 cal (th)/(h·cm²). At larger operational scale, 1000 Btu (IT)/hour/square foot corresponds to 271.427612 cal (th)/(h·cm²).

Inverse check: 1 cal (th)/(h·cm²) = 3.684224 Btu/(h·ft²).

Understanding Btu (IT)/hour/square foot and Calorie (th)/hour/square centimeter

Btu (IT)/hour/square foot

Btu/(h·ft²)
Imperial / US

A Btu (IT)/hour/square foot (Btu/(h·ft²)) is an imperial and US customary unit for heat flux density.

Applications & Practical Context

In practical heat flux density terms, a direct summer sunshine striking asphalt shingle roof surface equals 300 Btu/(h·ft²), a residential cast iron steam heating radiator surface heat flux equals 240 Btu/(h·ft²).

Physical Setup

A physical magnitude of 1 Btu/(h·ft²) corresponds to 3.154591 W/m² in standard SI measurement.

Conversion to SI Unit: watt per square meter (W/m²)
1 Btu/(h·ft²) = 3.154591 W/m²

Calorie (th)/hour/square centimeter

cal (th)/(h·cm²)
Standard Unit

A Calorie (th)/hour/square centimeter (cal (th)/(h·cm²)) is a recognized unit for heat flux density.

Applications & Practical Context

In practical heat flux density terms, a glass greenhouse passive solar heating transmission flux equals 60 cal (th)/(h·cm²).

Physical Setup

A physical magnitude of 1 cal (th)/(h·cm²) corresponds to 11.622217 W/m² in standard SI measurement.

Conversion to SI Unit: watt per square meter (W/m²)
1 cal (th)/(h·cm²) = 11.622217 W/m²

Domain Metrology & Engineering Applications

Governing Law & Equation

Thermal Transmission Flux (q = Q̇ / A)

Measurement Instrumentation

Rigorously quantified in laboratory and field settings using Schmidt-Boelter heat flux gauges, differential thermopile foil transducers, and calibrated Gardon radiant gauges.

Primary Industry Sectors

Applied across rocket nozzle combustion chamber analysis, fire resistance testing (ASTM E119), furnace wall heat loss auditing, and hypersonic aerothermal design under international metrology standard ISO 80000-5:2019, ASME PTC 19.3.

Institutional Metrology & Standard Authority:

Formulas, conversion coefficients, and base definitions on this page strictly adhere to the ISO 80000-5:2019, ASME PTC 19.3 and the BIPM SI Brochure (9th Edition). Governed by Thermal Transmission Flux (q = Q̇ / A) under ISO 80000 dimensional vector [M T⁻³].

Multi-Variable Engineering Bridge Thermal Radiation & Power Dissipation

Heat Flux Density to Total Thermal Power Bridge (Watts • Kilowatts • Megawatts • BTU/h • Horsepower)

Calculate total continuous heat dissipation power P = q" × A across surface barriers and exchangers, bridging heat flux density [M T⁻³] with thermal power [M L² T⁻³].

P = q" × A
Vector: [W/m²] × [m²] → [W]
Live Calculated Bridge Equivalent:
1 Btu/(h·ft²) at Industrial Hydronic Radiator Panel (8 m²) = 25.2367 W
Equals 0.02524 kW • 2.523673 × 10⁻⁵ MW • 0.03384 hp
SI Power
25.2367
W
Watts
Grid / Utility
0.02524
kW
Kilowatts
Power Plant
2.523673 × 10⁻⁵
MW
Megawatts
Mechanical Rating
0.03384
hp
Horsepower (Mechanical)
Metric Horsepower
0.03431
PS
Metric Horsepower (PS)
HVAC Thermal Rating
86.11
BTU/h
BTU per Hour
  1. 1. Normalize Input to SI Base Unit (W/m²):
    q" = 1 Btu/(h·ft²) × 3.15459075 = 3.15459075 W/m²
  2. 2. Apply Engineering Parameter (A):
    Selected condition: Industrial Hydronic Radiator Panel (8 m²) at A = 8 m²
  3. 3. Execute Governing Physical Law in SI Units:
    P = q" × A = (3.15459075 W/m²) × (8 m²) = 25.236726 W
  4. 4. Convert to Standard Engineering Units:
    • W: 25.236726 × 1 = 25.2367 W (Watts) • kW: 25.236726 × 0.001 = 0.02524 kW (Kilowatts) • MW: 25.236726 × 1 × 10⁻⁶ = 2.523673 × 10⁻⁵ MW (Megawatts) • hp: 25.236726 × 0.001341 = 0.03384 hp (Horsepower (Mechanical)) • PS: 25.236726 × 0.00136 = 0.03431 PS (Metric Horsepower (PS)) • BTU/h: 25.236726 × 3.4121 = 86.11 BTU/h (BTU per Hour)
Explore Full Power Converter →
Engineering Substance / Operating Standard Parameter Value (m²) Reference State / Condition Typical Industrial & Engineering Application
Residential Window Glazing (4 m²) 4 4.0 m² Double-pane exterior window glass aperture
Industrial Hydronic Radiator Panel (8 m²) 8 8.0 m² Convective space heating radiator surface
Shell & Tube Heat Exchanger (50 m²) 50 50.0 m² Industrial process fluid cooling bundle
Power Boiler Waterwall (200 m²) 200 200.0 m² Thermal power plant steam generator wall
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Frequently Asked Questions

There are exactly 0.27142761 calories (th)/hour/square centimeter (cal (th)/(h·cm²)) in 1 btu (it)/hour/square foot (Btu/(h·ft²)). To calculate larger amounts manually, simply multiply your total number of btus (it)/hour/square foot by the conversion multiplier of 0.27142761.

The mathematical formula to convert btus (it)/hour/square foot to calories (th)/hour/square centimeter is: [value] * 0.27142761 = calories (th)/hour/square centimeter. 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)/hour/square centimeter back to btus (it)/hour/square foot, you must divide your starting value by 0.27142761. Our bidirectional tool automatically computes this inverse equation the moment you type into the calorie (th)/hour/square centimeter input field.

1 Calorie (th)/hour/square centimeter is larger than 1 Btu (IT)/hour/square foot. Specifically, 1 Btu (IT)/hour/square foot equals 0.27142761 calories (th)/hour/square centimeter, meaning 1 Calorie (th)/hour/square centimeter is 3.6842 times larger than 1 Btu (IT)/hour/square foot (a difference of 0.57 orders of magnitude). Expressing measurements in btus (it)/hour/square foot requires a larger numerical value to represent the equivalent physical magnitude.

Under standard international measurement guidelines, 1 Btu (IT)/hour/square foot converts to 0.27142761 calories (th)/hour/square centimeter. Precise numerical conversion factors ensure consistency across laboratory, engineering, and field data.