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Btus (th)/hour/square foot/°F to Btus (IT)/hour/square foot/°F Converter (Btu (th)/(h·ft²·°F) to Btu/(h·ft²·°F))

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Live Conversion • ISO 80000-5:2019 Certified
1 Btu (th)/hour/square foot/°F = 0.99933041 Btu (IT)/hour/square foot/°F
1 Btu (th)/(h·ft²·°F) = 0.99933 Btu/(h·ft²·°F) • 1 Btu/(h·ft²·°F) = 1.00067 Btu (th)/(h·ft²·°F)
Btu (th)/hour/square foot/°F to Btu (IT)/hour/square foot/°F: One Btu (th)/hour/square foot/°F is equal to 0.99933041 Btus (IT)/hour/square foot/°F.
Certified Authority Value
0.99933041
Btu/(h·ft²·°F)
Exact: 1 Btu/(h·ft²·°F) ≡ 1.0006700358 Btu (th)/(h·ft²·°F)
Btu (th)/(h·ft²·°F)
Btu (th)/(h·ft²·°F)
Swap to Btu (IT)/hour/square foot/°F to Btu (th)/hour/square foot/°F
Swap to Btu (IT)/hour/square foot/°F to Btu (th)/hour/square foot/°F
Btu/(h·ft²·°F)
Btu/(h·ft²·°F) 0.99933041
Quick Values:
Conversion Formula
To convert Btu (th)/hour/square foot/°F to Btu (IT)/hour/square foot/°F, multiply by 0.99933041
Btu (th)/(h·ft²·°F) × 0.99933041 = Btu/(h·ft²·°F)

Calculation: 1 Btu (th)/(h·ft²·°F) × 0.99933041 = 0.99933041 Btu/(h·ft²·°F)

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

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

Tap any row to calculate
Btu (th)/hour/square foot/°F to Btu (IT)/hour/square foot/°F: Primary Direct Table (15 Steps)
Btu (th)/hour/square foot/°F to Btu (IT)/hour/square foot/°F Conversion Reference Table
Conversion & Equivalent Value Scientific Notation
0.001 Btu (th)/(h·ft²·°F) 0.00099933 Btu/(h·ft²·°F) 9.993 × 10⁻⁴
0.01 Btu (th)/(h·ft²·°F) 0.0099933 Btu/(h·ft²·°F) 9.993 × 10⁻³
0.1 Btu (th)/(h·ft²·°F) 0.099933 Btu/(h·ft²·°F) 9.993 × 10⁻²
0.5 Btu (th)/(h·ft²·°F) 0.499665 Btu/(h·ft²·°F) 4.997 × 10⁻¹
1 Btu (th)/(h·ft²·°F) 0.99933 Btu/(h·ft²·°F) 9.993 × 10⁻¹
2 Btu (th)/(h·ft²·°F) 1.998661 Btu/(h·ft²·°F) 1.999 × 10⁰
5 Btu (th)/(h·ft²·°F) 4.996652 Btu/(h·ft²·°F) 4.997 × 10⁰
10 Btu (th)/(h·ft²·°F) 9.993304 Btu/(h·ft²·°F) 9.993 × 10⁰
20 Btu (th)/(h·ft²·°F) 19.986608 Btu/(h·ft²·°F) 1.999 × 10¹
25 Btu (th)/(h·ft²·°F) 24.98326 Btu/(h·ft²·°F) 2.498 × 10¹
50 Btu (th)/(h·ft²·°F) 49.966521 Btu/(h·ft²·°F) 4.997 × 10¹
100 Btu (th)/(h·ft²·°F) 99.933041 Btu/(h·ft²·°F) 9.993 × 10¹
250 Btu (th)/(h·ft²·°F) 249.832603 Btu/(h·ft²·°F) 2.498 × 10²
500 Btu (th)/(h·ft²·°F) 499.665206 Btu/(h·ft²·°F) 4.997 × 10²
1000 Btu (th)/(h·ft²·°F) 999.330413 Btu/(h·ft²·°F) 9.993 × 10²
Btu (IT)/hour/square foot/°F to Btu (th)/hour/square foot/°F: Reciprocal Summary
Btu (IT)/hour/square foot/°F to Btu (th)/hour/square foot/°F Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 Btu/(h·ft²·°F) 1.00067 Btu (th)/(h·ft²·°F) 1.001 × 10⁰
5 Btu/(h·ft²·°F) 5.00335 Btu (th)/(h·ft²·°F) 5.003 × 10⁰
10 Btu/(h·ft²·°F) 10.0067 Btu (th)/(h·ft²·°F) 1.001 × 10¹
50 Btu/(h·ft²·°F) 50.033502 Btu (th)/(h·ft²·°F) 5.003 × 10¹
100 Btu/(h·ft²·°F) 100.067004 Btu (th)/(h·ft²·°F) 1.001 × 10²
View Complete 15-Row Btu (IT)/hour/square foot/°F to Btu (th)/hour/square 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/square foot/°F (Btu (th)/(h·ft²·°F)) and Btu (IT)/hour/square foot/°F (Btu/(h·ft²·°F)):

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

  • Heavy masonry uninsulated cavity wall overall U-factor 0.45 Btu (th)/(h·ft²·°F)

Btu (IT)/hour/square foot/°F References:

  • Standard modern residential double-pane window U-factor 0.28 Btu/(h·ft²·°F)
  • Still interior air film natural convection on drywall surface 1.46 Btu/(h·ft²·°F)
  • Winter 15 mph wind exterior building wall surface air film 6 Btu/(h·ft²·°F)

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

Converting Btu (th)/hour/square foot/°F (Btu (th)/(h·ft²·°F)) to Btu (IT)/hour/square foot/°F (Btu/(h·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 Btu (th)/hour/square foot/°F equals 0.99933 Btu (IT)/hour/square foot/°F, while 1 Btu/(h·ft²·°F) equals 1.00067 Btu (th)/(h·ft²·°F).

Direct Factor1 Btu (th)/(h·ft²·°F) = 0.99933 Btu/(h·ft²·°F)
Inverse Ratio1 Btu/(h·ft²·°F) = 1.00067 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 Btu/(h·ft²·°F) = 5.678269 watt per square meter kelvin (W/(m²·K))
Step-by-step substitution for Btu (th)/hour/square foot/°F → Btu (IT)/hour/square foot/°F:V(Btu/(h·ft²·°F)) = V(Btu (th)/(h·ft²·°F)) × ( 5.674467 / 5.678269 ) = V(Btu (th)/(h·ft²·°F)) × 0.99933
Mathematical FormulaValue in Btu (IT)/hour/square foot/°F = Value in Btu (th)/hour/square foot/°F × 0.99933041Direct computational formula applied for standard conversion.
Worked Example

Converting 250 Btu (th)/(h·ft²·°F) yields an exact output of 249.832603 Btu/(h·ft²·°F) in Btu (IT)/hour/square foot/°F. Under higher industrial throughput, 2500 Btu (th)/(h·ft²·°F) translates to 2498.326032 Btu/(h·ft²·°F).

Inverse check: 1 Btu/(h·ft²·°F) = 1.00067 Btu (th)/(h·ft²·°F).

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

Btu (th)/hour/square foot/°F

Btu (th)/(h·ft²·°F)
Imperial / US

A Btu (th)/hour/square 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 heavy masonry uninsulated cavity wall overall U-factor equals 0.45 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)

Btu (IT)/hour/square foot/°F

Btu/(h·ft²·°F)
Imperial / US

A Btu (IT)/hour/square foot/°F (Btu/(h·ft²·°F)) is an imperial and US customary unit for heat transfer coefficient.

Applications & Practical Context

In practical heat transfer coefficient terms, a standard modern residential double-pane window U-factor equals 0.28 Btu/(h·ft²·°F), a still interior air film natural convection on drywall surface equals 1.46 Btu/(h·ft²·°F), a winter 15 mph wind exterior building wall surface air film equals 6 Btu/(h·ft²·°F).

Physical Setup

A physical magnitude of 1 Btu/(h·ft²·°F) corresponds to 5.678269 W/(m²·K) in standard SI measurement.

Conversion to SI Unit: watt per square meter kelvin (W/(m²·K))
1 Btu/(h·ft²·°F) = 5.678269 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) × 5.67446717 = 5.67446717 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 = (5.67446717 W/(m²·K)) × (25 K) = 141.861679 W/m²
  4. 4. Convert to Standard Engineering Units:
    • W/m²: 141.861679 × 1 = 141.8617 W/m² (Watts per Square Meter) • kW/m²: 141.861679 × 0.001 = 0.1419 kW/m² (Kilowatts per Square Meter) • BTU/(h·ft²): 141.861679 × 0.317 = 44.9699 BTU/(h·ft²) (BTU per Hour Sq. Foot) • cal/(s·cm²): 141.861679 × 2.3885 × 10⁻⁵ = 0.00338831 cal/(s·cm²) (Calories per Second Sq. Cm) • Ly/min: 141.861679 × 0.001433 = 0.2033 Ly/min (Langley per Minute) • MW/m²: 141.861679 × 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 0.99933041 btus (it)/hour/square foot/°f (Btu/(h·ft²·°F)) in 1 btu (th)/hour/square foot/°f (Btu (th)/(h·ft²·°F)). To calculate larger amounts manually, simply multiply your total number of btus (th)/hour/square foot/°f by the conversion multiplier of 0.99933041.

The mathematical formula to convert btus (th)/hour/square foot/°f to btus (it)/hour/square foot/°f is: [value] * 0.99933041 = btus (it)/hour/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 (it)/hour/square foot/°f back to btus (th)/hour/square foot/°f, you must divide your starting value by 0.99933041. Our bidirectional tool automatically computes this inverse equation the moment you type into the btu (it)/hour/square foot/°f input field.

1 Btu (IT)/hour/square foot/°F is larger than 1 Btu (th)/hour/square foot/°F. Specifically, 1 Btu (th)/hour/square foot/°F equals 0.99933041 btus (it)/hour/square foot/°f, meaning 1 Btu (IT)/hour/square foot/°F is 1.0007 times larger than 1 Btu (th)/hour/square foot/°F (a difference of 0.00 orders of magnitude). Expressing measurements in btus (th)/hour/square foot/°f requires a larger numerical value to represent the equivalent physical magnitude.

Under standard international measurement guidelines, 1 Btu (th)/hour/square foot/°F converts to 0.99933041 btus (it)/hour/square foot/°f. Precise numerical conversion factors ensure consistency across laboratory, engineering, and field data.