Know how much to buy before you start the job
Home Project Materials offers free calculators that turn room and yard measurements into the quantities you need, from gallons of paint and cubic yards of concrete to fence posts, deck boards and bags of grass seed. You can also check whether an appliance is worth repairing.
Material calculators
- Paint CalculatorHow much paint do I need for a 12×12 room?
- Concrete CalculatorHow much concrete is required for a 10×10 slab?
- Mulch CalculatorHow much mulch do I need for my flower bed?
- Flooring CalculatorHow much does it cost to install laminate flooring?
- Tile CalculatorHow many tiles do I need for a room?
- Gravel CalculatorHow much gravel do I need for a driveway?
- Fence CalculatorHow many fence posts and pickets do I need?
- Deck Cost CalculatorHow much does it cost to build a backyard deck?
- Grass Seed CalculatorHow much grass seed do I need for my lawn?
Cost and decision tools
Latest guides
- Concrete Slab Thickness Guide: How Thick Should Your Slab Be?How thick to pour a concrete slab for a patio, walkway, shed, driveway or garage, plus base, reinforcement, joints and curing basics.
- Deck Joist Spacing and Composite vs Wood Decking ExplainedHow far apart to space deck joists, how that changes the number of joists you need, and how wood and composite decking compare.
- Fence Post Depth and Spacing: How Deep and How Far ApartHow deep to set fence posts, how far apart to space them, how much concrete to use, and what to check before you dig.
How these calculators work
Each calculator uses standard coverage figures, shows its formula on the page, and lets you change the numbers to match your product. You can add a price to turn a quantity into a cost estimate. Everything runs in your browser, so nothing you type is sent to us.
Before you buy materials
Measure twice and write the numbers down. Add an allowance for waste, since cuts, spills and mistakes use more than the bare area. Buy all of one material at the same time so color and batch match, and keep leftovers for repairs. For structural or large projects, check local codes and talk to a licensed professional.