Trades & Contractor Calculators

Practical calculation tools for electricians, drywallers, flooring installers, masons, plumbers, and movers. Sizing for wire gauge, tile, drywall sheets, concrete, HVAC BTUs, moving supplies, and pipe velocity.

HVAC BTU & Sizing

Calculate heating and cooling BTU requirements and AC tonnage for buildings.

Building & Climate Details

Input space dimensions and insulation properties.

Conditioned Floor Area

sq ft

200 sq ft5,000 sq ft

Climate Zone

Moderate four-season climate

Ceiling Height

Insulation Quality

Sun Exposure

Regular Occupants

Includes Kitchen Area (Adds 4,000 BTU/hr cooking & appliance heat load)

HVAC Sizing Results

4.5 TONS

Recommended AC Capacity

4.5 Tons

Standard unit rating: 54,000 BTU/hr

Cooling Load

55,000BTU/hr

Heating Load

72,000BTU/hr

Sizing Specifications

Calculated Cooling:	4.58 Tons (55,000 BTU/hr)
Standard Equipment:	4.5 Ton Heat Pump / AC
Required Airflow:	1800 CFM

Avoid Oversizing: Overly large air conditioners cool the room too quickly without dehumidifying, leading to damp, clammy air and frequent compressor cycling.