How the calculation works
Monthly revenue = customers × monthly fee. Monthly cash costs = customers × [chemicals per month + (travel + equipment reserve) × visits per month] + paid labor + overhead.
Owner earnings = revenue − cash costs and equipment reserve. Owner-time allowance = owner hours × hourly value. Profit after owner time = owner earnings − that allowance.
Break-even volume = fixed monthly costs ÷ contribution per job or customer after owner time, rounded up. Startup recovery = cash startup investment ÷ monthly profit after owner time. N/A means the available contribution or profit is not positive.