01 / ESTIMATING
Markup & margin
Calculate a selling price from your costs and target gross margin.
/ FREE WEB TOOLS
Useful tools.
Built for real work.
Explore 29 free tools for service businesses — from professional invoices and estimates to dedicated calculators for HVAC, electrical, plumbing, construction, landscaping and more.
No sign-up needed
Browser-based tools
Dedicated tool pages
/ DOCUMENT CREATORS
Create clean client documents.
Generate professional invoices and estimates in your browser with line items, taxes, discounts, notes and a printable PDF layout.
FREE DOCUMENT BUILDER
Invoice Creator
Create itemized invoices with company details, customer information, taxes, discounts and polished printable PDFs.
- Company + client information
- Line items, discounts and tax
- Print or save as PDF
Estimate Creator
Build branded estimates with detailed items, scope notes, totals, optional terms and a client-ready printable layout.
- Scope details and pricing rows
- Notes, terms and totals
- Print or save as PDF
/ ESSENTIAL BUSINESS CALCULATORS
The essentials, always close.
Use lightweight calculators for pricing, area and labor planning — perfect for quick checks before you quote the job.
02 / PLANNING
Area calculator
Calculate rectangular area in square feet.
03 / SCHEDULING
Labor cost
Estimate labor spend using hours, workers and hourly cost.
Indicative calculations only. Taxes, waste, overhead and other project variables are not included unless explicitly entered.
/ NEED MORE THAN QUICK TOOLS?
Run the full workflow in KOLO.
Free tools are perfect for quick wins. KOLO helps you manage customers, jobs, projects, estimates, invoices, files and your team in one connected workspace.
/ 24 SPECIALTY CALCULATORS
Find a tool for your work.
Browse specialized calculators for the work you do. Each tool has its own page with inputs, examples and a detailed result — no account required.
Results are preliminary estimates for planning, not engineering, safety, legal or code compliance advice. Follow equipment and chemical manufacturer instructions.