How much power does a typical colocation rack use?

A realistic average power consumption for a modern 42U colocation rack is 5-8 kW, with 6 kW being a solid baseline for initial planning. The wide variance from 2kW to 10kW+ stems from fundamental differences in hardware density and workload. A rack filled with legacy or light-duty equipment might draw 2-3 kW, while a high-density deployment of modern dual-processor servers or dense storage arrays can easily exceed 8 kW. The primary constraint is the rack's power circuit capacity, typically provisioned at either 208V/30A (approx. 6.2 kW) or 208V/60A (approx. 12.5 kW) in North America. To calculate your specific needs, you must sum the nameplate or rated power of all devices, applying a realistic utilization factor, as shown in this basic formula:

Total Estimated Power (kW) = Σ (Device Rated Power in kW * Expected Utilization %)

. For example, ten servers rated at 750W each running at 70% load would consume approximately 5.25 kW. Always plan based on your actual hardware specifications and negotiate the power circuit size (e.g., 30A vs. 60A) with your colocation provider, as this directly determines your maximum potential draw and cost.