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Power & cooling tools

Free, accurate calculators for planning resilient IT power: size a UPS from your real load, convert between watts, amps and VA, and work out how much cooling your server room needs. Built by a 24-year UK reseller — exact figures, no sign-up.

MainsUPSBattery runtime
Flagship

UPS Sizing & Runtime Calculator →

Build your IT load and get the recommended UPS kVA/kW, load current, heat output and a Peukert runtime estimate.

Converter

Watts ↔ Amps ↔ VA Calculator →

Convert between watts, amps and volt-amps with voltage and power factor — for UPS, generator and circuit sizing.

Cooling

Server Room Cooling Calculator →

Turn an IT load into a cooling requirement in BTU/hr and tons, with a design margin and N+1 spare.

What these tools answer

From a load list to a resilient room

How they convert÷ PF÷ (V·PF)VA ÷ V = AWattsW — real powerVAapparent powerAmpscurrent
Heat to removeNearly all the power a server draws becomes heat.IT LOAD5,000 W5 kWHEAT OUTPUT17,061BTU / hrCOOLING1.42tons (12k BTU)

Power factor links watts, VA and amps; and nearly all the power your kit draws comes back out as heat. Get these two relationships right and you size the UPS, the circuit and the cooling correctly the first time. Every figure here is calculated from exact, cited formulas — see the UPS calculator for the full sizing method.