Heat Transfer Calculator
Compute conductive Q=kAΔT/L or convective Q=hAΔT heat transfer rate. Runs locally in your browser.
Trust summary CVP VERIFIED · CVP protocol 1.0.0-proposed · Engineering assurance
- Input interpretation
- Enter values to calculate.
- Result
- —
- Assurance
- Engineering
- Declared partition coverage
- PASS · 2/2 declared partitions (heat-transfer, invalid-domain) · Matrix
- Known limitations
- Steady conduction / Newton cooling
- Core CVP does not include live graph, viewport, or pointer interaction.
- Model
- Conduction or convection heat rate.
- Scope
- 1-D steady state
- Verification
- Engine tested · Source checked · v1.0.0 · CVP VERIFIED · CVP protocol 1.0.0-proposed · Engineering assurance· View Manifest · CVP overview · Specification
- Versions
- Calculation 1.0.0 · CVP protocol 1.0.0-proposed
- CVP identity
- 1/1 property · digest 177d27704797
- Legacy regression
- 4/4 tests · Production surface contract 4/4
- Reference
- O1 model · O2 expected_values · O2 numerical_behavior
- Interfaces
- PASS · UI (SSR) / REST / MCP
- Supplemental domain review
- Internal · Pass
- Named expert review
- Not performed
- CVP suite
- 1/1 golden · 1/1 CVP boundary · 1/1 invalid · 1/1 property · 1/1 cross-interface · 1/1 CVP contract · Manifest
- Sources
- Incropera heat transfer basics
- ISO 80000-5 / heat transfer practice
- Evidence
- 2 legacy golden · 1 legacy boundary · legacy regression suite · 1/1 oracle-backed golden · 1/1 invalid · Artifact integrity PASS · CalculatorX electrical review
- Semantic contract
- PASS
Full verification
Formulas
Core equations used by this calculator.
How to use
Choose conduction or convection mode
Conduction needs k and L; convection needs h.
Enter area and temperature difference
A > 0 and ΔT as labeled on the form.
Read heat transfer rate Q
Conduction: Q = k·A·ΔT/L. Convection: Q = h·A·ΔT.
Example calculations
Common configurations with formula and result.
k=1 A=1 ΔT=10 L=0.1
conduction
Heat Transfer calculator specification
Version 1.0.0 · Engine tested · Supplemental domain review · Internal · 2026-08-09
- Engine tested 4/4 tests · Production surface contract 4/4
- Supplemental domain review Internal · Pass · 2026-08-09
- Named expert review Not performed
- Calculation version 1.0.0
Review policy · Evidence · Reviewed by CalculatorX electrical review
- Definition
- Fourier conduction: Q = k·A·ΔT/L. Newton cooling: Q = h·A·ΔT. Steady-state rates in watts.
- What it calculates
- Conduction or convection heat rate.
- Inputs
- mode
- A
- dT
- k,L or h
- Outputs
- Q_W
- Formula
Q=kAΔT/L- Assumptions
- 1-D steady state
- Units
- W, m², K, W/m·K
- Boundary conditions
- dT=0 → VALUE_MUST_BE_POSITIVE
- geometry ≤0 → VALUE_MUST_BE_POSITIVE
- Example
- k=1 A=1 dT=10 L=0.1 → 100 W
- Validation cases
1 published on this page · 4/4 tests · Production surface contract 4/4 · View evidence
- conduction k=1 A=1 dT=10 L=0.1 → Q=100
- Sources
- Incropera heat transfer basics — Conduction / convection ratesSupports: Fourier / Newton cooling
- ISO 80000-5 / heat transfer practice — Conduction and convectionSupports: Q = kAΔT/L; Q = hAΔT
- Incropera heat transfer basics — Conduction / convection rates
- Last reviewed
- 2026-08-09
- Reviewed by
- CalculatorX electrical review
- Calculation version
- 1.0.0
Background
Interpretation and common distinctions.
Estimate heat transfer rate.
Supported and not supported
Supported — Conduction and convection modes · API physics.thermo.heat_transfer
Not supported — Radiation, transient, multi-D
Agent / API notes
Capability id: physics.thermo.heat_transfer · tool id: heat-transfer · pin 1.0.0.
Related tools
Other calculators in this family: Stefan–Boltzmann, Heatsink Rth, LDO Thermal .
Frequently asked questions
Key distinctions behind the calculation.
Signed ΔT?
ΔT may be negative to indicate direction; magnitude must be non-zero.