Data center calculators
Each of these answers one question and shows its work. The full calculator on the home page does everything at once; these are preconfigured for a single job. All free, no signup.
Convert kW of IT load to tons and BTU/hr
Convert data center IT load in kW to tons of refrigeration, BTU per hour, and kW thermal. Exact conversion factors, why cooling load equals IT load, and what per-rack density means for cooling technology.
Convert kVA to kW and kW to kVA
Convert between kVA and kW using power factor, in either direction. Covers why UPS capacity is quoted in kVA, what power factor to use for modern IT equipment, and the UPS output rating that trips people up.
Size a UPS for your rack or room
Calculate required UPS capacity in kVA from IT load, power factor, redundancy target, and load factor. Covers N, N+1, and 2N configurations and why runtime cannot be calculated from load alone.
Server rack power calculator
Calculate rack power density in kW per rack and watts per square foot, how many circuits a rack needs, and which cooling technology that density requires. Includes 2026 density benchmarks and the ASHRAE high-density threshold.
Size power and cooling for AI and GPU racks
Calculate power, cooling, and circuit requirements for AI training racks. Current density figures for GB200 NVL72 and GB300 NVL72, liquid cooling thresholds, and high-voltage DC distribution.
PDU and branch circuit calculator
Calculate how many PDU input circuits a rack needs and the current on each leg of a three-phase PDU. Covers branch circuit balancing, PDU versus feed redundancy, and the 80% continuous-load derate.
AI rack power reference
What each AI platform draws per rack — GB200 NVL72, GB300 NVL72, Vera Rubin, Rubin Ultra — with cooling requirements, distribution voltage, and an honest account of where published figures disagree.
Rack receptacle reference
Every common NEMA and IEC rack receptacle with voltage, amperage, phase, nominal kVA, and the number most tables leave out — what you can actually load onto it after the NEC 80% continuous-load derate.
How these are built
Every calculator runs the same engine and cites the same standards — NEC 210.20(A) for continuous loads, ASHRAE TC 9.9 for thermal classes. Formulas, constants, and assumptions are published on the methodology page so you can check a result or hand it to an engineer who will.