Useful numbers before the job starts
These free service business calculators turn real operating inputs into transparent planning estimates. Nothing is hidden: every tool shows its formula, assumptions, limits, and the numbers you should verify before quoting or designing work.
No signup is required to use any calculator.
Choose a worksheet
Three calculators built for field decisions
HVAC CFM Calculator
Convert room area, ceiling height, and target air changes per hour into an estimated airflow requirement.
Open calculator →02 / PRICINGCleaning Price Calculator
Estimate labor time, direct cost, gross profit, and a suggested cleaning quote using your own production rate.
Open calculator →03 / JOB COSTPlumbing Cost Calculator
Build a plumbing price from materials, loaded labor, overhead allocation, and target gross margin.
Open calculator →How to use an estimating calculator responsibly
A calculator is most useful when its assumptions match the work your company actually performs. Start with the provided example, then replace every default with measurements from your own jobs. For pricing tools, use loaded labor cost rather than an employee’s wage alone. For airflow, use the room’s actual dimensions and an appropriate ventilation target.
Save the result as a planning baseline, not a promise. Site conditions, local codes, travel, permits, taxes, access, equipment, risk, and customer-specific scope can change the final answer. Compare estimated hours and costs with completed jobs regularly; that feedback is how a basic formula becomes a reliable estimating process.