Skip to content
Townsend Networks
RFQSell Your Gear

Rack Power and Heat Calculator: Watts to BTU/hr

Add the switches going into a rack and get the most they draw in watts, the current at your supply voltage, and the heat to plan cooling for, in BTU per hour.

Switches in the rack
SwitchHow manyWatts, mostBTU per hourRemove
3341,139
Power, most
334 W
Current at 120 V
2.78 A
Heat
1,139 BTU/hr

DCS-7050CX3-32C

Watts (334 W): Arista 7050X3 Series Data Sheet, Arista Networks (Sept 4, 2026 03-0040-46; page 8, Specifications, row "Typical/Max Power", column 7050CX3-32C (the second figure)). 165W / 334W The maker's note: Typical power consumption measured at 25C ambient with 50% load on all ports, excludes transceivers

Heat: the maker prints no BTU per hour figure for this model, so it is 334 W times 3.41, the factor below.

Watts to BTU per hour (3.41): MX204 Power Planning, Juniper Networks (web page, no revision printed; Calculating System Thermal Output, the sentence after "you can use that information to determine the system thermal output (BTUs per hour)."). To do so, multiply the power consumption in watts by 3.41.

How it works

Watts are the most each switch draws as its maker states it. For a PoE switch, some makers count the power sent to the PoE devices in that figure and some leave it out; the source line under each switch says which.

Heat is the maker's own BTU per hour figure where the maker prints one. Where it does not, the watts are multiplied by 3.41, the factor in the maker's power planning guide.

Current is the total watts divided by the supply voltage you pick. These are planning figures from the makers' documents; the circuit and the cooling are sized by your electrician and facilities team against the maker's installation guide.

Sources

  1. Arista 7050X3 Series Data Sheet, Arista Networks (Sept 4, 2026 03-0040-46). Model Overview (pages 2 and 3); Technical Specifications, Specifications tables (pages 8 and 9)
  2. Arista 7280R3 Series Data Sheet, Arista Networks (August 11th, 2025 03-0045-59). Model overview (page 4); Technical Specifications, Model Comparison for 7280SR3-48YC8, 7280SR3K-48YC8, 7280SR3K-48YC8A (page 13)
  3. Cisco Catalyst 2960-X and 2960-XR Series Switches Data Sheet, Cisco (Updated November 5, 2021). Table 2 (PoE and PoE+ power capacity); Table 4 (2960-X Series configurations); Table 13 (performance); Table 15 (mechanical specifications); Table 21 (Power consumption)
  4. EX2300 Switch Hardware Guide, Juniper Networks (Published 2025-08-12). EX2300 Switches Hardware Overview (guide pages 5 to 9 and 14); Table 3: Physical Specifications of the EX2300 Switch Chassis; Table 14: Power Consumed by EX2300 Switches
  5. EX3400 Switch Hardware Guide, Juniper Networks (Published 2026-01-09). EX3400 Switches First View; Front Panel of an EX3400 Switch; Table 3: Physical Specifications of the EX3400 Switch Chassis; Table 11: Power Consumed by EX3400 Switches
  6. RUCKUS ICX 7150 data sheet, CommScope (RUCKUS Networks) (PA-114000.5 (11/25)). RUCKUS ICX 7150 Product Series (page 4); RUCKUS ICX 7150 Feature/Model Comparison (pages 6 and 7); ordering information
  7. Ruckus ICX 7250 Switch Hardware Installation Guide, Ruckus (ARRIS) (Part Number 53-1003898-08, Publication Date 25 January 2019). TABLE 2 ICX 7250 models (page 13); Power supply usage, TABLE 7 (pages 20 and 21); Weight and physical dimensions (pages 96 and 97); Power consumption (maximum configuration) (page 100)
  8. RUCKUS ICX 7450 Switch Data Sheet, RUCKUS Networks (CommScope) (PA-113849.2-EN (05/22)). RUCKUS ICX 7450 Feature/Model Comparison (pages 6 and 7)
  9. Ruckus ICX 7750 Switch Data Sheet, RUCKUS Networks (CommScope) (PA-113853.1-EN (04/20)). Ruckus ICX 7750 Feature/Model Comparison (pages 6 and 7)
  10. MX204 Power Planning, Juniper Networks (web page, no revision printed). Calculating System Thermal Output

Checked against the makers' documents on November 5, 2026.

More tools