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

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Live Conversion • ISO 80000-5:2019 Certified
1 BTU (IT)/second/sq. foot = 977.13903442 Calorie (th)/hour/cm²
1 Btu/(s·ft²) = 977.139034 cal (th)/(h·cm²) • 1 cal (th)/(h·cm²) = 0.0010234 Btu/(s·ft²)
BTU (IT)/second/sq. foot to Calorie (th)/hour/cm²: One BTU (IT)/second/sq. foot is equal to 977.13903442 Calories (th)/hour/cm².
Certified Authority Value
977.13903442
cal (th)/(h·cm²)
Exact: 1 cal (th)/(h·cm²) ≡ 0.001023395817 Btu/(s·ft²)
Btu/(s·ft²)
Btu/(s·ft²)
Swap to Calorie (th)/hour/cm² to BTU (IT)/second/sq. foot
Swap to Calorie (th)/hour/cm² to BTU (IT)/second/sq. foot
cal (th)/(h·cm²)
cal (th)/(h·cm²) 977.13903442
Quick Values:
Conversion Formula
To convert BTU (IT)/second/sq. foot to Calorie (th)/hour/cm², multiply by 977.13903442
Btu/(s·ft²) × 977.13903442 = cal (th)/(h·cm²)

Calculation: 1 Btu/(s·ft²) × 977.13903442 = 977.13903442 cal (th)/(h·cm²)

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

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

Tap any row to calculate
BTU (IT)/second/sq. foot to Calorie (th)/hour/cm²: Primary Direct Table (15 Steps)
BTU (IT)/second/sq. foot to Calorie (th)/hour/cm² Conversion Reference Table
Conversion & Equivalent Value Scientific Notation
0.001 Btu/(s·ft²) 0.977139 cal (th)/(h·cm²) 9.771 × 10⁻¹
0.01 Btu/(s·ft²) 9.77139 cal (th)/(h·cm²) 9.771 × 10⁰
0.1 Btu/(s·ft²) 97.713903 cal (th)/(h·cm²) 9.771 × 10¹
0.5 Btu/(s·ft²) 488.569517 cal (th)/(h·cm²) 4.886 × 10²
1 Btu/(s·ft²) 977.139034 cal (th)/(h·cm²) 9.771 × 10²
2 Btu/(s·ft²) 1954.278069 cal (th)/(h·cm²) 1.954 × 10³
5 Btu/(s·ft²) 4885.695172 cal (th)/(h·cm²) 4.886 × 10³
10 Btu/(s·ft²) 9771.390344 cal (th)/(h·cm²) 9.771 × 10³
20 Btu/(s·ft²) 19542.780688 cal (th)/(h·cm²) 1.954 × 10⁴
25 Btu/(s·ft²) 24428.47586 cal (th)/(h·cm²) 2.443 × 10⁴
50 Btu/(s·ft²) 48856.951721 cal (th)/(h·cm²) 4.886 × 10⁴
100 Btu/(s·ft²) 97713.903442 cal (th)/(h·cm²) 9.771 × 10⁴
250 Btu/(s·ft²) 244284.758604 cal (th)/(h·cm²) 2.443 × 10⁵
500 Btu/(s·ft²) 488569.517208 cal (th)/(h·cm²) 4.886 × 10⁵
1000 Btu/(s·ft²) 977139.034417 cal (th)/(h·cm²) 9.771 × 10⁵
Calorie (th)/hour/cm² to BTU (IT)/second/sq. foot: Reciprocal Summary
Calorie (th)/hour/cm² to BTU (IT)/second/sq. foot Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 cal (th)/(h·cm²) 0.0010234 Btu/(s·ft²) 1.023 × 10⁻³
5 cal (th)/(h·cm²) 0.00511698 Btu/(s·ft²) 5.117 × 10⁻³
10 cal (th)/(h·cm²) 0.010234 Btu/(s·ft²) 1.023 × 10⁻²
50 cal (th)/(h·cm²) 0.0511698 Btu/(s·ft²) 5.117 × 10⁻²
100 cal (th)/(h·cm²) 0.10234 Btu/(s·ft²) 1.023 × 10⁻¹
View Complete 15-Row Calorie (th)/hour/cm² to BTU (IT)/second/sq. 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)/second/sq. foot (Btu/(s·ft²)) and Calorie (th)/hour/cm² (cal (th)/(h·cm²)):

BTU (IT)/second/sq. foot References:

  • Solar constant extraterrestrial solar irradiance at top of atmosphere 0.119843 Btu/(s·ft²)
  • Clear sky direct midday summer sunlight striking sea level ground 0.088055 Btu/(s·ft²)
  • Human body resting thermal metabolic heat radiation to room 0.004403 Btu/(s·ft²)
  • Overcast winter day diffuse solar irradiance at sea level 0.008806 Btu/(s·ft²)

Calorie (th)/hour/cm² References:

  • Solar constant extraterrestrial solar irradiance at top of atmosphere 117.1 cal (th)/(h·cm²)
  • Clear sky direct midday summer sunlight striking sea level ground 86.0421 cal (th)/(h·cm²)
  • Human body resting thermal metabolic heat radiation to room 4.3021 cal (th)/(h·cm²)
  • Overcast winter day diffuse solar irradiance at sea level 8.6042 cal (th)/(h·cm²)

Tap any benchmark above to automatically calculate its exact equivalent in Calorie (th)/hour/cm².

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

How to Convert BTU (IT)/second/sq. foot to Calorie (th)/hour/cm²

Converting BTU (IT)/second/sq. foot (Btu/(s·ft²)) to Calorie (th)/hour/cm² (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)/second/sq. foot equals 977.139034 Calorie (th)/hour/cm², while 1 cal (th)/(h·cm²) equals 0.0010234 Btu/(s·ft²).

Direct Factor1 Btu/(s·ft²) = 977.139034 cal (th)/(h·cm²)
Inverse Ratio1 cal (th)/(h·cm²) = 0.0010234 Btu/(s·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/(s·ft²) = 11356.527 watt per square meter (W/m²)
2. Target SI Bridge (ktarget):1 cal (th)/(h·cm²) = 11.622222 watt per square meter (W/m²)
Step-by-step substitution for BTU (IT)/second/sq. foot → Calorie (th)/hour/cm²:V(cal (th)/(h·cm²)) = V(Btu/(s·ft²)) × ( 11356.527 / 11.622222 ) = V(Btu/(s·ft²)) × 977.139034
Mathematical FormulaValue in Calorie (th)/hour/cm² = Value in BTU (IT)/second/sq. foot × 977.13903442Direct computational formula applied for standard conversion.
Worked Example

For an engineering input of 36 Btu/(s·ft²), applying the conversion factor yields exactly 35177.005239 cal (th)/(h·cm²). At larger operational scale, 5000 BTU (IT)/second/sq. foot corresponds to 4885695.172084 cal (th)/(h·cm²).

Inverse check: 1 cal (th)/(h·cm²) = 0.0010234 Btu/(s·ft²).

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

BTU (IT)/second/sq. foot

Btu/(s·ft²)
Imperial / US

A BTU (IT)/second/sq. foot (Btu/(s·ft²)) is an imperial and US customary unit for heat flux density.

Applications & Practical Context

In practical heat flux density terms, a solar constant extraterrestrial solar irradiance at top of atmosphere equals 0.119843 Btu/(s·ft²), a clear sky direct midday summer sunlight striking sea level ground equals 0.088055 Btu/(s·ft²), a human body resting thermal metabolic heat radiation to room equals 0.004403 Btu/(s·ft²).

Physical Setup

A physical magnitude of 1 Btu/(s·ft²) corresponds to 11356.527 W/m² in standard SI measurement.

Conversion to SI Unit: watt per square meter (W/m²)
1 Btu/(s·ft²) = 11356.527 W/m²

Calorie (th)/hour/cm²

cal (th)/(h·cm²)
Standard Unit

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

Applications & Practical Context

In practical heat flux density terms, a solar constant extraterrestrial solar irradiance at top of atmosphere equals 117.1 cal (th)/(h·cm²), a clear sky direct midday summer sunlight striking sea level ground equals 86.0421 cal (th)/(h·cm²), a human body resting thermal metabolic heat radiation to room equals 4.3021 cal (th)/(h·cm²).

Physical Setup

A physical magnitude of 1 cal (th)/(h·cm²) corresponds to 11.622222 W/m² in standard SI measurement.

Conversion to SI Unit: watt per square meter (W/m²)
1 cal (th)/(h·cm²) = 11.622222 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/(s·ft²) at Industrial Hydronic Radiator Panel (8 m²) = 90852.216 W
Equals 90.8522 kW • 0.0908522 MW • 121.8348 hp
SI Power
90852.216
W
Watts
Grid / Utility
90.8522
kW
Kilowatts
Power Plant
0.0908522
MW
Megawatts
Mechanical Rating
121.8348
hp
Horsepower (Mechanical)
Metric Horsepower
123.5246
PS
Metric Horsepower (PS)
HVAC Thermal Rating
310000.63
BTU/h
BTU per Hour
  1. 1. Normalize Input to SI Base Unit (W/m²):
    q" = 1 Btu/(s·ft²) × 11356.527 = 11356.527 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 = (11356.527 W/m²) × (8 m²) = 90852.216 W
  4. 4. Convert to Standard Engineering Units:
    • W: 90852.216 × 1 = 90852.216 W (Watts) • kW: 90852.216 × 0.001 = 90.8522 kW (Kilowatts) • MW: 90852.216 × 1 × 10⁻⁶ = 0.0908522 MW (Megawatts) • hp: 90852.216 × 0.001341 = 121.8348 hp (Horsepower (Mechanical)) • PS: 90852.216 × 0.00136 = 123.5246 PS (Metric Horsepower (PS)) • BTU/h: 90852.216 × 3.4121 = 310000.63 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 977.13903442 calories (th)/hour/cm² (cal (th)/(h·cm²)) in 1 btu (it)/second/sq. foot (Btu/(s·ft²)). To calculate larger amounts manually, simply multiply your total number of btus (it)/second/sq. foot by the conversion multiplier of 977.13903442.

The mathematical formula to convert btus (it)/second/sq. foot to calories (th)/hour/cm² is: [value] * 977.13903442 = calories (th)/hour/cm². 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/cm² back to btus (it)/second/sq. foot, you must divide your starting value by 977.13903442. Our bidirectional tool automatically computes this inverse equation the moment you type into the calorie (th)/hour/cm² input field.

1 BTU (IT)/second/sq. foot is larger than 1 Calorie (th)/hour/cm². Specifically, 1 BTU (IT)/second/sq. foot equals exactly 977.13903442 calories (th)/hour/cm², making it 977.139 times larger (a difference of 2.99 orders of magnitude). Therefore, quantities expressed in calories (th)/hour/cm² require a larger numerical value to represent the same physical amount.

Under standard international measurement guidelines, 1 BTU (IT)/second/sq. foot converts to 977.13903442 calories (th)/hour/cm². Precise numerical conversion factors ensure consistency across laboratory, engineering, and field data.