Gravel, mulch & paver calculators
Know exactly how many cubic yards, bags or pieces to buy. Free calculators for gravel, mulch, pavers, fences and decks. No sign-up needed.
Free outdoor project calculators
Pick your project, enter length, width and depth, and get the amount to order.
Fence post calculator
How many fence posts you need and the right fence post spacing for your run.
Open calculator →Gravel calculator
Cubic yards and tons of gravel for driveways, paths and bases.
Coming soonMulch calculator
How much mulch for garden beds at 2 to 4 inches deep.
Coming soonPaver calculator
Number of pavers, plus base gravel and sand for patios and walkways.
Coming soonDeck calculator
Decking boards, joists and screws for a deck of any size.
Coming soonHow to work out how much material you need
The same three steps work for gravel, mulch, soil and sand.
1. Measure the area
Multiply length by width in feet to get square feet. For odd shapes, split the area into rectangles and add them up.
2. Choose the depth
Mulch usually goes 2 to 3 inches deep. Gravel paths need 2 to 4 inches, and driveways 4 to 6 inches.
3. Convert to cubic yards
Area × depth in feet ÷ 27 gives cubic yards. Add 5 to 10 percent extra for waste and settling.
Frequently asked questions
Quick answers on quantities, spacing and coverage.
How much gravel do I need?
Multiply the area in square feet by the depth in feet, then divide by 27 to get cubic yards. One cubic yard of gravel covers about 100 square feet at 3 inches deep.
How much mulch do I need for a garden bed?
One cubic yard of mulch covers roughly 100 square feet at 3 inches deep. A 2 cubic foot bag covers about 8 square feet at the same depth.
How many pavers do I need for a patio?
Divide the patio area by the area of one paver, then add about 10 percent for cuts and breakage. Remember to order base gravel and sand as well.
How far apart should fence posts be?
Most wood fences use a post spacing of 6 to 8 feet, measured centre to centre. Use the fence post calculator to even out the spacing across your whole run.
Are these calculators free?
Yes. Every ExactYard calculator is free to use and works on your phone, tablet or computer.