🇨🇦 Canada
Heat Load Calculator
(Canada)
Calculate heating & cooling loads for Canadian homes
CSA F280-12Free Trade Calculators
Professional tools to help you estimate, plan, and quote jobs accurately
100% free. No signup, no email required, no spam. Just tools that work.
HVAC
Size equipment, airflow, and ductwork
Heat Load Calculator
🇺🇸 US
Heat Load Calculator
(US)
Calculate heating & cooling loads for American homes
ACCA Manual JGlobal
CFM Calculator
(Airflow / Air Changes)
Find required CFM from room size or heating/cooling load
CFM = V × ACH ÷ 60Global
Duct Size Calculator
Size round and rectangular ducts from CFM and velocity
d = √(4A ÷ π)Plumbing
Pipe volumes, weights, and runs
Electrical
Service loads and panel sizing
Missing a calculator?
Tell us what would save you time on the job and we will build it.
Ready to streamline your business?
WorkZen helps service businesses manage jobs, create estimates, and get paid faster.