Free Tools

Free calculators for the trades

Quick, accurate calculators built for HVAC, plumbing, and contracting pros — for sizing equipment, pricing jobs, and estimating volumes in the field. No sign-up required.

Field service business owner using calculators on a tablet

HVAC technician sizing a residential air conditioning system

HVAC BTU Calculator

Estimate the cooling BTUs and tonnage a space needs by size, sun, and occupants.

Open calculator

Contractor reviewing job pricing and profit margins on an estimate

Markup & Margin Calculator

Turn your material and labor costs and a target margin into the right price to charge.

Open calculator

Plumber measuring pipe to estimate water volume and capacity

Pipe Volume Calculator

Find a pipe's volume in gallons, liters, and cubic feet from its inside diameter and length.

Open calculator

Service technician creating and sending an invoice from a tablet

Free Invoice Generator

Build a professional HVAC, plumbing, or electrical invoice and download it as a PDF — free, no signup.

Open calculator

Contractor building a job estimate and quote on a tablet

Job Estimate Calculator

Turn labor, materials, overhead, and margin into a profitable quote price with a full breakdown.

Open calculator

HVAC technician measuring register airflow with an anemometer

CFM Calculator

Find required room airflow from dimensions and air changes per hour, with an ACH chart.

Open calculator

Roofing contractor measuring a roof to estimate squares and bundles

Roofing Calculator

Turn house footprint and roof pitch into roof area, squares, shingle bundles, and underlayment.

Open calculator

Run your whole field service business in one platform

Scheduling, dispatch, quoting, invoicing, and payments — built for HVAC, plumbing, electrical, and the trades.

See Service Storm Book a 30-min demo