DwellNinja Homeowner Tools
Transparent, data-backed calculators to help you size equipment, estimate project needs, and avoid costly home improvement mistakes.
Available Calculators
3 Live ToolsAC BTU Calculator: What Size Air Conditioner Do I Need?
Estimate the BTU cooling capacity your room needs based on room size, sun exposure, occupancy and kitchen use using ENERGY STAR sizing guidance.
Dehumidifier Sizing Calculator: What Size Do I Need?
Calculate the right dehumidifier size for a room, basement, crawlspace, or home using current ENERGY STAR sizing guidance, humidity, temperature, and moisture conditions.
Sump Pump Sizing Calculator: Find the GPM & Head You Need
Calculate the sump pump flow you need based on pit size, water inflow, vertical lift, pipe length and discharge head. Get your required GPM, GPH and TDH.
More Homeowner Tools Coming Soon
We are building additional transparent sizing tools for electrical, plumbing, and HVAC projects.
Generator Size Calculator
Calculate running and starting wattages to select the right portable or standby generator for power outages.
Sump Pump Size Calculator
Estimate required sump pump horsepower and discharge head capacity based on pit volume and water flow.
Dehumidifier Size Calculator
Determine pint capacity needed for basements and damp living areas based on square footage and moisture level.