LoadCairn / Free planning tools

Data center engineering calculators.

Use these twenty-nine free tools for critical-facility planning. Estimate UPS runtime and sizing, power factor correction, transformer capacity, motor starting and generator step load, available fault current, cooling load, BTU-to-tons conversion, cooling-unit count and redundancy, airflow, humidification load, electrical raceway and tray fill, voltage drop, energy cost, rack power, standby generator sizing, facility efficiency, rack floor loading, rack layout, and MPO fiber breakout.

Showing 29 of 29 calculators.

Cooling & Airflow

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Cooling load & BTU

Estimate cooling load from IT demand, lighting, people, and envelope heat gain, then screen A2L refrigerant room conditions by volume.

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BTU to Tons Cooling Converter

Convert BTU/hr to refrigeration tons or tons to BTU/hr, with the conversion arithmetic and thermal kW equivalent shown.

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Cooling airflow (CFM)

Estimate sensible airflow from heat load and temperature rise with a disclosed 1.08 coefficient.

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Cooling Unit Count & Redundancy

Estimate required cooling units and compare N+1, N+2, and 2N using derated capacity, installed capacity, and utilization.

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Dew point & humidity

Estimate dew point, humidity ratio, vapor pressure, and condensation risk with an ASHRAE recommended-envelope screen.

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Humidification Load

Estimate ventilation humidification demand from outdoor and indoor design conditions, with a visible humidity-ratio and water-rate trace.

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Chilled water flow (GPM)

Convert cooling load and chilled-water ΔT into GPM, L/s, m³/h, and optional pipe velocity.

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Power & UPS

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UPS battery runtime

Estimate runtime from load, battery-bank configuration, UPS efficiency, and remaining capacity.

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Rack power & PDU capacity

Compare rack real-power load with estimated single- or balanced three-phase PDU capacity.

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kW, kVA & Amps

Convert real power, apparent power, voltage, current, and power factor with explicit phase assumptions.

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PUE & DCiE

Estimate facility power usage effectiveness, IT infrastructure efficiency, and non-IT overhead.

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Standby generator sizing

Estimate standby generator kW and kVA requirements with a transparent, browser-local planning calculator.

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Motor starting & generator step load

Estimate motor starting kVA, three-phase current, and optional generator step load using the selected NEMA code midpoint and starter planning factor.

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Generator fuel burn & runtime

Estimate diesel fuel burn, runtime on usable tank fuel, and the minimum tank for a target runtime.

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UPS battery sizing

Size required DC power, watts per battery and per cell, and strings needed for a target runtime.

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Transformer sizing

Estimate demand kW, required transformer kVA, recommended standard size, and loading from editable planning factors.

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Available fault current

Estimate three-phase transformer available fault current and fault MVA from kVA, secondary voltage, and impedance, with each calculation step shown.

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Power factor correction

Estimate three-phase capacitor correction, kVA freed, and line-current change from current and target power factor.

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Cabling

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MPO Fiber Breakout Planner

Plan duplex LC link counts, 12- or 24-fiber MPO trunks, spare capacity, breakout cassettes, and enclosure RU.

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Reliability & Network

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WUE — Water Usage Effectiveness

Estimate annual site water use per unit of IT energy, convert litres to US gallons, and compare with a qualified reference.

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Facilities & Space

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Floor loading

Compare average rack floor loading with a rated capacity using the rack’s rectangular footprint.

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Rack Layout & Floor Space Planner

Estimate rack rows and positions from room dimensions, rack size, aisle widths, and perimeter clearance.

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Clean-agent fire suppression quantity calculator

Estimate FK-5-1-12 or HFC-227ea quantity from room volume and minimum temperature with a visible NFPA 2001 total-flooding calculation.

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Availability & downtime

Translate availability percentages into downtime and compare N, N+1, and 2N redundancy for identical units.

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Fiber link loss budget

Add fiber, connector, and splice loss, then check the total against 10G, 40G, and 100G channel limits.

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Voltage drop

Estimate single- or three-phase drop using copper or aluminum conductor area and circuit length.

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Cable tray fill

Estimate cable area and tray use for ladder and ventilated tray widths from 6 to 36 inches.

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Conduit fill

Estimate conduit fill with NEC Chapter 9 Table 1 limits, Table 4 raceway areas, and Table 5 conductor areas.

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Data center energy cost

Estimate per-rack and all-rack monthly and annual energy, demand, and total cost.

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