Home Improvement Calculators for
Materials, Costs & Complete Projects
Measure. Estimate. Build Smarter.
Free project calculators with 3D visualization, material estimation, combined shopping lists, and cost tracking for DIYers and builders.
Free calculators · No signup required · Imperial and metric units
(Create a free account to add up to 5 project items and export up to 3 PDFs)
Featured Calculators
Quick planning estimates for common home improvement projects.
Interior Paint Calculator
Estimate how many gallons of paint you need for walls, ceilings, and trim inside your home.
Use Calculator →Tile Calculator
Figure out how many tiles and boxes you need for floors, walls, and backsplashes.
Use Calculator →Flooring Calculator
Calculate boxes of hardwood, laminate, or vinyl plank for any room.
Use Calculator →Gravel Calculator
Get cubic yards and tonnes of gravel for driveways, paths, and drainage.
Use Calculator →Deck Railing Calculator
Estimate railing balusters, posts, and top rails for your deck project.
Use Calculator →Concrete & Cement Calculator
Calculate cubic yards of concrete for slabs, footings, and posts.
Use Calculator →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
Clearer Estimates Start With Clear Assumptions
Understand the calculation approach, review the values that affect an estimate, and prepare better measurements before planning your purchase.
How Calculations Work
Explore common formulas, unit conversions, waste allowances, and purchase rounding, with worked examples that explain the estimating process.
Read the Methodology →Material Data & References
Review measurement references and product-specific information for coverage, yield, and dimensions. Learn which values to confirm before ordering.
Explore Sources & Assumptions →Measure & Plan Better
Follow practical steps for measuring your project, choosing inputs, reviewing quantities, and combining estimates without counting materials twice.
Read the Planning Guide →Want to understand calculation checks or report a possible error? Read about calculator checks and reporting errors →
Results are preliminary planning estimates. Confirm product specifications, quantities, and local requirements before purchasing or beginning work.
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. Sign in with a Free account to add up to 5 project items and export up to 3 PDFs. Premium provides unlimited project items and PDF exports.
- 1 Sign in, use a calculator, and click “Add to Project”
- 2 Your materials and costs build up automatically
- 3 View your complete shopping list and budget
- 4 Export PDFs: Free accounts up to 3; Premium unlimited (sign-in required)
Premium Plan
- ✓ Unlimited Project Items
- ✓ Unlimited PDF Exports
- ✓ Multi-Room Planning
Frequently Asked Questions
Quick answers to help you get started with Home Z Calc.