Calculator collection

Mechanical & Electrical Calculators

Create preliminary HVAC and electrical planning estimates with the governing loads, demand factors, assumptions, and safety limits made visible.

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Featured mechanical & electrical calculators

These focused tools cover the most common starting points in this trade. The complete searchable collection remains below.

HVAC Planning Index Calculator →A transparent early planning index—not an equipment-sizing result.Electrical Load Calculator →A transparent 2023 NEC 220.82 planning worksheet—not panel selection.AC Size & BTU Calculator →Use the ENERGY STAR room-AC table and its published adjustments.

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3 calculators available

Mechanical & Electrical3

AC Size & BTU CalculatorUse the ENERGY STAR room-AC table and its published adjustments.Electrical Load CalculatorA transparent 2023 NEC 220.82 planning worksheet—not panel selection.HVAC Planning Index CalculatorA transparent early planning index—not an equipment-sizing result.

What these estimates include

These tools do not replace Manual J, Manual S, engineered design, utility requirements, permits, or work by licensed professionals. Use them to prepare better questions and budgets.

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