Server math, instantly solved.
Power draw, heat load, circuit sizing and running cost for real server models, built on published vendor specs and SPECpower measurements. No signup, no fluff, no overpromises.
Specs sourced from public docs of
- Dell PowerEdge
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- HPE ProLiant
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- Lenovo ThinkSystem
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- Supermicro
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- Cisco UCS
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- Intel Xeon
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- AMD EPYC
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- SPECpower
Six clusters, one workflow
Every calculator targets a specific sizing question. Pick the category that matches what you are planning.
Featured calculators
Server Power Consumption Calculator
Server power consumption calculator for Dell PowerEdge, HPE ProLiant, Lenovo ThinkSystem, Supermicro and Cisco UCS. Get watts, kWh, running cost, BTU/hr and amps.
42U Server Rack Power Consumption Calculator
Build a 42U rack from real servers, switches and storage and get its power draw in kW, amps, circuits, heat in BTU/hr, weight and running cost. Space, power and weight budgets in one view.
AI Server Rack Power Consumption Calculator
AI rack power calculator: enter how many GPUs you need and get racks, kW per rack, total megawatts, cooling method, heat load and cost per accelerator per year.
Built right, kept free
Vendor sizing tools hide the formula and gate the result behind a sales form. These do not.
Real model database
Dell PowerEdge, HPE ProLiant, Lenovo ThinkSystem, Supermicro, Cisco UCS and GPU nodes, each with its real chassis, socket and PSU defaults.
Load-aware, not nameplate
PSU nameplate wattage is not power draw. These calculators model the idle floor, the utilization curve, and PSU efficiency at the actual load point.
Instant, no signup
Calculations run in your browser as you type. No accounts, no email gates, no marketing follow-ups.
Privacy-first
Static site, no backend, no analytics until you accept. Your inputs never leave your device.
Facility-ready numbers
BTU/hr, cooling tons, amps per circuit, UPS VA, PUE-adjusted cost and CO2e. Everything the facility team asks for.
Mobile-friendly
Every calculator works on phones. Useful when you are already standing in the cold aisle.
All calculators
Organized by category. Pick the one closest to your use case.
Power & Energy
· 7 calculators42U Server Rack Power Consumption Calculator
Build a 42U rack from real servers, switches and storage and get its power draw in kW, amps, circuits, heat in BTU/hr, weight and running cost. Space, power and weight budgets in one view.
AI Server Rack Power Consumption Calculator
AI rack power calculator: enter how many GPUs you need and get racks, kW per rack, total megawatts, cooling method, heat load and cost per accelerator per year.
Dell Server Power Consumption Calculator
Dell PowerEdge power consumption calculator covering R770, R670, R7725, R760, R750, R740 and the AI line: XE9680, XE9680L, XE9685L, XE8640, XE9640, XE7745, R760xa.
HP Server Power Consumption Calculator
HP / HPE ProLiant power consumption calculator for DL360 and DL380 Gen10 and Gen11, DL325, DL345, ML350 and DL20. Watts, kWh, cost, BTU/hr and amps.
NVIDIA Server Rack Power Consumption Calculator
NVIDIA rack power calculator for GB200 and GB300 NVL72, DGX B200, H200, H100 and HGX nodes. Get kW per rack, amps, circuits, liquid cooling load, weight and annual cost.
Server Power Consumption Calculator
Server power consumption calculator for Dell PowerEdge, HPE ProLiant, Lenovo ThinkSystem, Supermicro and Cisco UCS. Get watts, kWh, running cost, BTU/hr and amps.
Supermicro Server Power Consumption Calculator
Supermicro power consumption calculator: 22 SuperServers from X11 and X12 through Hyper, CloudDC and the Blackwell AI line. Watts, kWh, cost, BTU/hr and rack amps.
Cooling & Thermal
· 1 calculatorVirtualization
· 1 calculatorSize the rack before you order the hardware.
From a single 1U in a closet to a 42U row of GPU nodes, work out the watts, the heat, the breakers and the bill first.