Business and trade mathematics
Solar installation calculators
Compare a supplied installed quote with self-used and exported energy value. Generation, tariff and incentive assumptions are supplied; no roof or electrical design is inferred.
Solar installation supplied energy payback
Compare a supplied solar quote with separately entered self-used and exported energy values.
Open calculator →Solar quote cost per watt and specific yield
Compare supplied solar quote cost and annual AC energy against declared DC nameplate capacity.
Open calculator →Service business hourly rate
Recover annual overhead and owner compensation across billable hours.
Open calculator →Job profit and margin
Reconcile a completed job using actual revenue and actual costs.
Open calculator →Lighting retrofit financial payback
Compare measured fixture watts hours maintenance and installed costs.
Open calculator →Employee loaded hourly cost
Turn user-entered annual compensation and burdens into productive-hour cost.
Open calculator →Recurring service route customer capacity
Calculate recurring-customer capacity from crew visit time, travel and service frequency for mowing, pest control, pool service and other field routes.
Open calculator →Service callback and warranty visit cost
Budget the recorded cost of nonbillable return visits using supplied labor, travel and parts expense.
Open calculator →Area and square footage
Measure rectangles, triangles, circles and trapezoids; combine sections and subtract cutouts to find net square footage.
Open calculator →Roof area and roofing squares
Estimate roof surface area, roofing squares and shingle bundles from measured roof planes, a simple pitched footprint or known surface area.
Open calculator →General total cost of ownership
Add acquisition, recurring, one-off and end-of-life costs over a supplied ownership period for an asset or service.
Open calculator →Receivables aging and past due balances
Group remaining invoice balances by calendar days past their supplied due dates.
Open calculator →Electricity bill blended and variable rate
Separate an effective all-in electricity bill rate from the entered energy-charge component.
Open calculator →Fuel reserve operating runtime
Estimate constant-consumption runtime from usable fuel and a measured or supplied matching burn rate.
Open calculator →Battery backup energy runtime
Estimate constant-load backup duration from supplied battery energy and real-watt loads.
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