Work out load calculation for building instantly with clear inputs, formula shown and shareable results.
Building load starts from connected load — lighting and small power by area density plus HVAC and fixed equipment — then applies a demand factor to each category, because not everything runs simultaneously at full output. The resulting maximum demand is what sizes the supply and transformer.
Building load
connected = area x W/m2 + HVAC + equipment; maximum demand applies a factor per category
Electrical results are planning estimates only. Verify against the applicable wiring rules (IEC 60364, BS 7671, NEC or local code) and have all installation work designed and checked by a qualified electrician.
Roughly 15-25 W/m2 for offices including small power, 40-80 W/m2 for retail with display lighting, and far more for data or catering areas.
It would be grossly oversized and expensive. Diversity between categories and within them is real and is recognised by every wiring code.