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Fin Efficiency Calculator — Straight Rectangular Fin
Calculate adiabatic-tip straight-fin efficiency from convection coefficient, conductivity, thickness and length.
Last updated: September 17, 2026
Results
Use valid positive geometry and properties
Formula, example and assumptions
m=√(2h/(kt)); η=tanh(mL)/(mL).
For h=25 W/m²K, k=200 W/mK, t=2 mm and L=50 mm, η≈0.906.
- Thin rectangular fin with convection from both broad faces.
- Tip heat loss is neglected by the adiabatic-tip model.
Frequently asked questions
What does the Fin Efficiency Calculator calculate?
Calculate adiabatic-tip straight-fin efficiency from convection coefficient, conductivity, thickness and length.
Which units should I use?
The input labels show the required SI units. Keep properties and geometry consistent before using the result in another engineering calculation.
Can I use this result for design?
Use it for transparent engineering estimates and checks. Validate property data, geometry, correlations and applicable codes for safety-critical design.