2025-07-24 00:00:00 Heat duty calculator allows you to calculate the duty or heat rate for sensible heat transfer and latent heat transfer. The flow rate can be specified as volumetric or mass flow rate. Density input is required when the flow rate is specified by volume. The calculator support SI Units and English (US) units of measurements. Flow rate input units - m3/s, m3/h, m3/day, ft3/s, ft3/h, ft3/day, kg/s, kg/h, kg/day, lb/s, lb/h, lb/day