Underfloor heating kits are commonly sold by coverage area. The useful area is not always the same as the room footprint, especially in kitchens and bathrooms.
Measure only the heated floor area
Exclude fixed cabinets, baths and permanent fixtures where heating should not be installed. Then choose the closest mat or cable size without cutting the heating cable.
Check the electrical details
Compare total wattage, supply requirements, thermostat compatibility and floor-finish limits. The demo product variants show separate stock for each coverage size.

