Free tools for pool & construction crews.
Simple calculators, templates, and a 50-state contractor licensing guide. No signup, no fluff, works on your phone. Built by people who actually run jobs.
Pool tools
2 toolsPool Volume & Chemical Dosing Calculator
Get your pool's gallons, then exact chlorine, pH, alkalinity, calcium, and stabilizer doses.
Pool Salt Calculator
Saltwater pool? Get the pounds and 40 lb bags of salt to add to hit your target ppm.
Estimating & bidding
3 toolsMarkup vs Margin Calculator
Enter job cost and one number you know. See sell price, profit, markup, and margin side by side.
Cost Per Square Foot
Enter any two of total cost, area, and price per square foot. Get the third instantly.
Concrete Calculator
Cubic yards and 60/80 lb bag counts for a slab or footing, with a waste allowance.
Paperwork & compliance
2 toolsEstimate & Invoice Generator
Fill the form, print or save a clean estimate or invoice PDF. Nothing leaves your browser.
COI Expiration Tracker
Track sub and vendor insurance certificates. Color-coded 30, 14, and 7 day expiration alerts.
Contractor licensing
50 states + DCDo you need a contractor license where you work?
A full guide for every state: who regulates it, the dollar threshold that triggers a license, classifications, bonds, insurance, exams, fees, renewal, and step-by-step how to apply. Written from official state board sources.
Free, no signup
Every tool works instantly in your browser. Nothing to install, no account, no email wall.
Built by the trade
Made by the crew behind Workhand, a job app for pool builders and contractors. We run jobs too.
Works in the field
Fast and mobile-first, so it holds up on a phone at the jobsite, not just at a desk.