Free Business Calculators
Professional calculators for contractors, HVAC technicians, and tradespeople. Get accurate results instantly, no signup required.
HVAC CFM Calculator
Calculate the exact airflow (CFM) needed for any room based on dimensions and air changes per hour. Perfect for HVAC sizing and ventilation design.
Roof Pitch Calculator
Convert roof pitch between degrees, radians, percentage, and x:12 ratio. Calculate rafter length and roof area multiplier from rise and run measurements.
Decking Calculator
Calculate how many deck boards, linear feet, and screws you need for your project. Supports all board sizes and installation patterns.
Profit Margin Calculator
Calculate your true profit margin instantly. Enter revenue and costs to see gross profit, markup percentage, and cost breakdown for any job.
Labor Cost Calculator
Calculate your true hourly labor costs including wages, burden rate, overhead, and profit margin. Know exactly what to charge clients per hour.
House Cleaning Cost Calculator
Calculate competitive pricing for residential cleaning jobs. Price by room count or square footage with add-on services and cleaning type adjustments.
Solar Calculator
Calculate how many solar panels you need, annual power generation, system costs, and savings. Solar power calculator with accurate energy production estimates.
Work Hours Calculator
Calculate daily and weekly work hours with break deduction. Convert to decimal hours for timesheets and payroll. Supports overnight shifts.
EV Charging Calculator
Calculate how long it takes to charge your electric vehicle and estimate the cost. Works with Level 1, Level 2, and DC fast chargers.
Markup Calculator
Calculate selling price from cost and markup percentage. Find markup vs margin, reverse calculate from price, and understand the difference between markup and margin.
Concrete Calculator
Calculate cubic yards, cubic feet, bags needed, and estimated cost for any concrete shape - slabs, columns, stairs, circular pads, tubes, and curb & gutter.
Drywall Calculator
Calculate how many drywall sheets you need for any room or whole-house project. Supports multiple rooms, sheet sizes, door/window deductions, waste factor, and cost estimate.
Break-Even Calculator
Calculate your break-even point in units and revenue. See contribution margin, CM ratio, and profit or loss at any sales volume — with a visual break-even chart.
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