MAXScanner engineering calculator
Heat Exchanger Area Calculator — Q, U, LMTD & Correction Factor
Size preliminary heat-transfer area from duty, overall U-value, LMTD and correction factor, with design margin.
Last updated: September 17, 2026
Results
Use Q≥0, positive U/LMTD, F in (0,1], and non-negative margin
Formula, example and assumptions
A=Q/(U·F·LMTD).
500 kW with U=800 W/m²K, LMTD=40 K and F=0.9 requires about 17.36 m² before margin.
- U is an overall design coefficient on the same area basis.
- F must match exchanger arrangement; fouling should be reflected in design U or margin.
Frequently asked questions
What does this Heat Exchanger Area Calculator solve?
Size preliminary heat-transfer area from duty, overall U-value, LMTD and correction factor, with design margin.
Which units should I use?
Use the SI units shown beside each input. The results also expose practical converted outputs where useful.
Can I use this for final equipment selection?
Use it for transparent engineering estimates and cross-checks. Confirm fluid properties, manufacturer curves and applicable design codes before final selection.