Choose a Home Systems Tool
Home system projects are easier when the planning is clear. These calculators provide simple, transparent estimates based on typical household usage patterns and common layout rules of thumb.
We document assumptions and maintain our tools as standards and product specs change. For transparency, see Methodology, Data Sources, and Review Board.
Water Softener Size Calculator
Estimate a suitable softener capacity for your household based on usage and water hardness assumptions.
Open calculator →Recessed Lighting Calculator
Plan fixture count and spacing for balanced lighting, with simple grid-based layout guidance.
Open calculator →Important Estimate Disclaimer
Calculator outputs are general estimates only. Actual system requirements can vary due to water chemistry, local codes, fixture specifications, ceiling height, wiring constraints, and site conditions.
For electrical work, follow local regulations and consult a licensed electrician when required. For water treatment systems, verify sizing with a water test and the manufacturer’s documentation.