Socket load

Socket load calculator

Add every appliance plugged into a single 13A socket or one extension lead. A BS 1363 socket is fused at 13A (≈ 3,000W at 230V). Stay under that and you are safe; over it and the plug fuse, socket or lead can overheat.

Appliance

Watts

Appliance

Watts

Quick add

Total load105W

Estimated current @ 230V0.46A

% of 13A / 3,000W limit4%

Within safe limits. Keep the lead unrolled, don't cover it, and avoid adding a fan heater or kettle on top.

Formula

Total watts = Σ appliances
Current (A) = Watts ÷ 230

Safe limit = 3,000W (13A) per socket / lead.

Reference

BS 1363 plugs are fitted with a 13A cartridge fuse. High-current heating appliances (kettles, heaters, irons) should have their own wall socket, never share an extension lead.

Disclaimer — no liability

These calculators are provided for guidance and educational use only. All results must be verified by a competent person against BS 7671:2018+A4:2026, manufacturer data and the specific site conditions before any design, installation or certification decision is made.

All Cabling© Limited accepts no liability whatsoever for any loss, damage, injury, cost or non-compliance arising directly or indirectly from use of, or reliance on, these tools. By using them you accept these terms in full.