Calculator

Heat Loss Calculator

Estimate heat loss before and after insulation for a furnace, boiler, hot pipe, duct or tank — and the energy cost saving from insulating it properly.

Surface

Surface Area (m²)

Diameter (mm)

Length (m)

Temperatures & Operation

Operating Temperature (°C)

Ambient Temperature (°C)

Operating Hours / Day

Energy Cost (PKR per kWh-equivalent)

Insulation (After)

Insulation Thickness (mm)

Set to 0 for "currently bare / uninsulated".

Insulation Material

Desired Outer Surface Temp for Suggested Thickness (°C)

Live Result

Heat Loss

Heat Loss — Before Insulation —

Heat Loss — After Insulation —

Heat Saved —

Monthly Energy Saving —

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How this is calculated

Before insulation (bare surface): Heat Loss = h × Area × (Operating Temp − Ambient Temp), where h is a combined convective + radiative coefficient that increases with temperature difference — a standard simplification for bare hot-surface loss.
After insulation: Heat Loss = Area × (Operating Temp − Ambient Temp) / (Thickness / k + 1 / h₀), where k is the chosen material's thermal conductivity and h₀ is a representative outer-surface film coefficient.
Pipe and tank surfaces are treated as their equivalent cylindrical side area (π × Diameter × Length); tank ends are excluded from this estimate.
This is a budgeting-level estimate to guide your decision and generate an accurate inquiry — not a substitute for a full engineering heat-balance study on a critical process line.