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Btus (IT)/second/square foot to Btus (th)/second/square inch Converter (Btu/(s·ft²) to Btu (th)/(s·in²))

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Live Conversion • ISO 80000-5:2019 Certified
1 Btu (IT)/second/square foot = 0.0069490587 Btu (th)/second/square inch
1 Btu/(s·ft²) = 0.00694906 Btu (th)/(s·in²) • 1 Btu (th)/(s·in²) = 143.904383 Btu/(s·ft²)
Btu (IT)/second/square foot to Btu (th)/second/square inch: One Btu (IT)/second/square foot is equal to 0.0069490587 Btus (th)/second/square inch.
Certified Authority Value
0.00694906
Btu (th)/(s·in²)
Exact: 1 Btu (th)/(s·in²) ≡ 143.9043828095 Btu/(s·ft²)
Btu/(s·ft²)
Btu/(s·ft²)
Swap to Btu (th)/second/square inch to Btu (IT)/second/square foot
Swap to Btu (th)/second/square inch to Btu (IT)/second/square foot
Btu (th)/(s·in²)
Btu (th)/(s·in²) 0.0069490587
Quick Values:
Conversion Formula
To convert Btu (IT)/second/square foot to Btu (th)/second/square inch, multiply by 0.0069490587
Btu/(s·ft²) × 0.0069490587 = Btu (th)/(s·in²)

Calculation: 1 Btu/(s·ft²) × 0.0069490587 = 0.0069490587 Btu (th)/(s·in²)

Common Btu (IT)/second/square foot to Btu (th)/second/square inch Calculations

Quick-lookup reference table showing calculated equivalents for standard increments between Btu (IT)/second/square foot (Btu/(s·ft²)) and Btu (th)/second/square inch (Btu (th)/(s·in²)).

Tap any row to calculate
Btu (IT)/second/square foot to Btu (th)/second/square inch: Primary Direct Table (15 Steps)
Btu (IT)/second/square foot to Btu (th)/second/square inch Conversion Reference Table
Conversion & Equivalent Value Scientific Notation
0.001 Btu/(s·ft²) 6.949059 × 10⁻⁶ Btu (th)/(s·in²) 6.949 × 10⁻⁶
0.01 Btu/(s·ft²) 6.949059 × 10⁻⁵ Btu (th)/(s·in²) 6.949 × 10⁻⁵
0.1 Btu/(s·ft²) 0.000694906 Btu (th)/(s·in²) 6.949 × 10⁻⁴
0.5 Btu/(s·ft²) 0.00347453 Btu (th)/(s·in²) 3.475 × 10⁻³
1 Btu/(s·ft²) 0.00694906 Btu (th)/(s·in²) 6.949 × 10⁻³
2 Btu/(s·ft²) 0.0138981 Btu (th)/(s·in²) 1.39 × 10⁻²
5 Btu/(s·ft²) 0.0347453 Btu (th)/(s·in²) 3.475 × 10⁻²
10 Btu/(s·ft²) 0.0694906 Btu (th)/(s·in²) 6.949 × 10⁻²
20 Btu/(s·ft²) 0.138981 Btu (th)/(s·in²) 1.39 × 10⁻¹
25 Btu/(s·ft²) 0.173726 Btu (th)/(s·in²) 1.737 × 10⁻¹
50 Btu/(s·ft²) 0.347453 Btu (th)/(s·in²) 3.475 × 10⁻¹
100 Btu/(s·ft²) 0.694906 Btu (th)/(s·in²) 6.949 × 10⁻¹
250 Btu/(s·ft²) 1.737265 Btu (th)/(s·in²) 1.737 × 10⁰
500 Btu/(s·ft²) 3.474529 Btu (th)/(s·in²) 3.475 × 10⁰
1000 Btu/(s·ft²) 6.949059 Btu (th)/(s·in²) 6.949 × 10⁰
Btu (th)/second/square inch to Btu (IT)/second/square foot: Reciprocal Summary
Btu (th)/second/square inch to Btu (IT)/second/square foot Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 Btu (th)/(s·in²) 143.904383 Btu/(s·ft²) 1.439 × 10²
5 Btu (th)/(s·in²) 719.521914 Btu/(s·ft²) 7.195 × 10²
10 Btu (th)/(s·in²) 1439.043828 Btu/(s·ft²) 1.439 × 10³
50 Btu (th)/(s·in²) 7195.21914 Btu/(s·ft²) 7.195 × 10³
100 Btu (th)/(s·in²) 14390.438281 Btu/(s·ft²) 1.439 × 10⁴
View Complete 15-Row Btu (th)/second/square inch to Btu (IT)/second/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)/second/square foot (Btu/(s·ft²)) and Btu (th)/second/square inch (Btu (th)/(s·in²)):

Btu (IT)/second/square foot References:

  • Atmospheric orbital reentry heat shield peak aerodynamic flux 50 Btu/(s·ft²)

Btu (th)/second/square inch References:

  • Gas turbine first-stage stationary nozzle guide vane heat flux 0.5 Btu (th)/(s·in²)

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

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

How to Convert Btu (IT)/second/square foot to Btu (th)/second/square inch

Converting Btu (IT)/second/square foot (Btu/(s·ft²)) to Btu (th)/second/square inch (Btu (th)/(s·in²)) 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/square foot equals 0.00694906 Btu (th)/second/square inch, while 1 Btu (th)/(s·in²) equals 143.904383 Btu/(s·ft²).

Direct Factor1 Btu/(s·ft²) = 0.00694906 Btu (th)/(s·in²)
Inverse Ratio1 Btu (th)/(s·in²) = 143.904383 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) = 11356.526682 watt per square meter (W/m²)
2. Target SI Bridge (ktarget):1 Btu (th)/(s·in²) = 1634253.963066 watt per square meter (W/m²)
Step-by-step substitution for Btu (IT)/second/square foot → Btu (th)/second/square inch:V(Btu (th)/(s·in²)) = V(Btu/(s·ft²)) × ( 11356.526682 / 1634253.963066 ) = V(Btu/(s·ft²)) × 0.00694906
Mathematical FormulaValue in Btu (th)/second/square inch = Value in Btu (IT)/second/square foot × 0.0069490587Direct computational formula applied for standard conversion.
Worked Example

For an engineering input of 250 Btu/(s·ft²), applying the conversion factor yields exactly 1.737265 Btu (th)/(s·in²). At larger operational scale, 5000 Btu (IT)/second/square foot corresponds to 34.745293 Btu (th)/(s·in²).

Inverse check: 1 Btu (th)/(s·in²) = 143.904383 Btu/(s·ft²).

Understanding Btu (IT)/second/square foot and Btu (th)/second/square inch

Btu (IT)/second/square foot

Btu/(s·ft²)
Imperial / US

A Btu (IT)/second/square 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 atmospheric orbital reentry heat shield peak aerodynamic flux equals 50 Btu/(s·ft²).

Physical Setup

A physical magnitude of 1 Btu/(s·ft²) corresponds to 11356.526682 W/m² in standard SI measurement.

Conversion to SI Unit: watt per square meter (W/m²)
1 Btu/(s·ft²) = 11356.526682 W/m²

Btu (th)/second/square inch

Btu (th)/(s·in²)
Imperial / US

A Btu (th)/second/square inch (Btu (th)/(s·in²)) is an imperial and US customary unit for heat flux density.

Applications & Practical Context

In practical heat flux density terms, a gas turbine first-stage stationary nozzle guide vane heat flux equals 0.5 Btu (th)/(s·in²).

Physical Setup

A physical magnitude of 1 Btu (th)/(s·in²) corresponds to 1634253.963066 W/m² in standard SI measurement.

Conversion to SI Unit: watt per square meter (W/m²)
1 Btu (th)/(s·in²) = 1634253.963066 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) = 90852.2135 W
Equals 90.8522 kW • 0.0908522 MW • 121.8348 hp
SI Power
90852.2135
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
310000.62
BTU/h
BTU per Hour
  1. 1. Normalize Input to SI Base Unit (W/m²):
    q" = 1 Btu/(s·ft²) × 11356.52668223 = 11356.52668223 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 = (11356.52668223 W/m²) × (8 m²) = 90852.213458 W
  4. 4. Convert to Standard Engineering Units:
    • W: 90852.213458 × 1 = 90852.2135 W (Watts) • kW: 90852.213458 × 0.001 = 90.8522 kW (Kilowatts) • MW: 90852.213458 × 1 × 10⁻⁶ = 0.0908522 MW (Megawatts) • hp: 90852.213458 × 0.001341 = 121.8348 hp (Horsepower (Mechanical)) • PS: 90852.213458 × 0.00136 = 123.5246 PS (Metric Horsepower (PS)) • BTU/h: 90852.213458 × 3.4121 = 310000.62 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 0.0069490587 btus (th)/second/square inch (Btu (th)/(s·in²)) in 1 btu (it)/second/square foot (Btu/(s·ft²)). To calculate larger amounts manually, simply multiply your total number of btus (it)/second/square foot by the conversion multiplier of 0.0069490587.

The mathematical formula to convert btus (it)/second/square foot to btus (th)/second/square inch is: [value] * 0.0069490587 = btus (th)/second/square inch. 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 inch back to btus (it)/second/square foot, you must divide your starting value by 0.0069490587. Our bidirectional tool automatically computes this inverse equation the moment you type into the btu (th)/second/square inch input field.

1 Btu (th)/second/square inch is larger than 1 Btu (IT)/second/square foot. Specifically, 1 Btu (IT)/second/square foot equals 0.0069490587 btus (th)/second/square inch, meaning 1 Btu (th)/second/square inch is 143.9044 times larger than 1 Btu (IT)/second/square foot (a difference of 2.16 orders of magnitude). Expressing measurements in btus (it)/second/square foot requires a larger numerical value to represent the equivalent physical magnitude.

Under standard international measurement guidelines, 1 Btu (IT)/second/square foot converts to 0.0069490587 btus (th)/second/square inch. Precise numerical conversion factors ensure consistency across laboratory, engineering, and field data.