Projector Throw Ratio and Distance Calculator
Calculate projector throw distance, required throw ratio, or image width. Check whether a projector’s published zoom range fits your setup.
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Sports Lighting Installation and Operating Cost Calculator
Estimate sports-lighting installation cost, energy per event, annual operating cost, and LED retrofit payback from your schedule and utility rate.
Projector Lumens and Screen Brightness Calculator
Calculate projector screen brightness in foot-lamberts and nits, or find the lumens needed for your screen and target brightness.
Monobloc vs Split Air-to-Water Heat Pump Lifetime Cost Calculator
Compare monobloc and split air-to-water heat pump quotes by upfront price, annual electricity cost, lifetime cost, and break-even year.
Sauna Heater Size and Electrical Circuit Calculator
Estimate electric sauna heater kW, adjusted room volume, planning amps, and compare a chosen heater manual’s circuit requirements.
Graywater Recycling System Size and Payback Calculator
Estimate graywater supply, landscape and soil limits, annual utility savings, and simple payback using US bill rates in $/CCF.
Whole-House Leak Shutoff Payback Calculator
Estimate cash-only and risk-adjusted payback for a whole-house leak detector using installed cost, bills, insurance, recurring costs, and risk.
Desiccant vs Compressor Dehumidifier Lifetime Cost Calculator
Compare desiccant and compressor dehumidifier purchase, electricity, maintenance, lifetime cost, and break-even time.
Ducted vs Unducted Heat Pump Water Heater Cost Calculator
Compare unducted, exhaust-only, and fully ducted heat pump water heater costs, including yearly HVAC effects and duct quotes.
Vinyl vs Fiberglass vs Wood Window Lifetime Cost Calculator
Compare vinyl, fiberglass, and wood window quotes over your ownership period, including replacements and optional wood maintenance.