Convection (Newton's Law) Calculator

Surface heat flux from h, area, and ΔT

🌡

Convection (Newton's Law)

Surface heat flux from h, area, and ΔT

$$q = h A \left(T_s - T_\infty\right)$$

Free convection in air: $h \approx 2{-}25\ \text{W/m}^2\text{K}$. Forced liquid: $h \approx 500{-}10{,}000\ \text{W/m}^2\text{K}$.

h (W/m²·K)

A (m²)

T_s (°C)

T_∞ (°C)

Please fill in all fields.

Convective Heat Rate q

—W

📄 Free Download

Get the WTF Formula Sheet

Every equation from all 6 topics in one clean PDF. Made for exams, problem sets, and the moments when you have no idea what the flux is going on.

✓ You're in — check your inbox for the formula sheet.