HOME Z CALC

Home Project Calculators
From A to Z

Measure. Estimate. Build Smarter.

Free calculators for paint, flooring, tile, concrete, lumber and more. Estimate materials, waste and project costs using imperial or metric units.

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Free calculators · No signup required · Imperial and metric units

(Create a free account to save and manage up to 5 project items)

Featured Calculators

Quick planning estimates for common home improvement projects.

More calculators for drywall, insulation, and landscaping are coming soon.

Browse by Category

Find the right tool for your project. Explore our specialized calculators below.

Flooring Calculators

Hardwood, laminate, tile & more

Paint Calculators

Interior, exterior, trim & more

Construction Calculators

Concrete, drywall, framing & more

Material Calculators

Gravel, mulch, soil & more

Room & Space Calculators

Area, perimeter, volume & more

Workshop & DIY Math

Lumber, screws, angles & more

Plan Your Entire Project in One Place

The Project Planner lets you combine results from multiple calculators into a single project with a shopping list and budget tracker. A free account is required to use the Planner. Premium unlocks unlimited projects, printable PDF and Excel exports, multi-room planning, and an ad-free experience.

  • 1 Use any calculator and click “Add to Project”
  • 2 Your materials and costs build up automatically
  • 3 View your complete shopping list and budget
  • 4 Export to PDF or Excel (Premium feature)
Open Project Planner → View Pricing Plans

Premium Plan

$4.99/mo
  • ✓ Unlimited Saved Projects
  • ✓ PDF & Excel Exports
  • ✓ Multi-Room Planning
  • ✓ Ad-Free Experience
Upgrade to Premium

Frequently Asked Questions

Everything you need to know about our calculator tools.

Are these calculators free to use?
Yes. All calculators on this site are free to use, with no signup required. Use them as many times as you like.
Do I need an account to use the calculators?
No. You can use every calculator without creating an account. You only need an account to use the Project Planner, save your projects, or access premium export features.
How accurate are the results?
The calculators use standard formulas for material estimation. Results depend on your measurements, selected waste factor, product coverage, and local requirements. Always check the product label or manufacturer data before purchasing.
What units do the calculators support?
Most calculators support both imperial (feet, inches) and metric (metres, centimetres). You can choose your preferred unit at the top of each calculator.
What is the Project Planner?
The Project Planner lets you add results from multiple calculators into a single project, create a shopping list, estimate your budget, and keep notes. A free account is required to use the Planner. Premium unlocks unlimited projects, multi-room planning, and PDF/Excel exports.
How much paint do I need for a room?
To estimate paint, measure the total wall area (perimeter × height) minus windows and doors, then divide by the coverage per gallon (usually 350–400 sq ft). Use our Interior Paint Calculator to get an instant answer with paint gallons and cost.
How do I calculate how many tiles I need?
Measure the floor or wall area (length × width), then divide by the area of one tile, including the grout gap. Add 10% extra for cuts and breakage. Our Tile Calculator does it for you. Just enter the room dimensions and tile size.

Ready to Start Your Home Project?

Pick a calculator, enter your measurements, and get your estimate in seconds.

Browse Featured Calculators