Walkway Size Calculator

As a rule of thumb: a main entry 4 to 5 ft so two people can walk side by side, driveway-to-door about 4 ft, side paths 3 ft, garden paths 2 to 3 ft, and utility paths 18 to 24 in. For accessibility, the ADA minimum clear width is 36 in, with 48 in recommended for comfortable wheelchair travel. Mode 1 of this calculator sizes each path type for you, and it flags any width under 36 in.

Take a main-entry walkway 25 ft long. The recommended sweet spot is 4.5 ft wide, giving 25 x 4.5 = 112.5 sq ft of surface. At 54 in wide it clears the ADA 36 in minimum and is wide enough for two people to walk abreast without stepping off the path.

The area is 4 x 24 = 96 sq ft. A 4x8 in paver covers 4.5 pavers per sq ft, so the exact count is 432 pavers. A herringbone pattern needs about 10 percent waste for cuts, so order 476 pavers (about 44 extra). This mode is a quick planner; for a full takeoff with per-pattern cut estimates, soldier-course borders, and pallet math, use the dedicated paver calculator linked below.

Volume is 4 x 25 x (4/12) = 33.33 cu ft, which is 1.23 cu yd. With 5 percent waste that rounds up to a 1.50 cu yd ready-mix order, or 56 80 lb bags if you mix by hand (one 80 lb bag yields about 0.6 cu ft). Pour walkways 4 in thick over a 4 in compacted gravel base, which adds about 1.23 cu yd of base material at this size.

A 3 ft by 20 ft path at 3 in deep is 0.56 cu yd compacted. Order 0.75 cu yd (the extra covers compaction and handling), which weighs about 1.05 US tons at 1.4 tons per cu yd. Lay landscape fabric underneath first, about 63 sq ft for this path, and use 2 to 4 in of depth for a comfortable walking surface.

Divide the path length by stone length plus gap: 240 in / (18 + 3) = 11.4, so 12 stones. Use stones at least 18 in wide for comfortable single-file walking, keep gaps at 2 to 4 in so the stride feels natural, and set each stone level with its neighbors to avoid trip edges.

Give the surface a 2 percent cross slope (1:48) away from the house. On a 4 ft wide walkway that is a drop of 0.96 in from the high edge to the low edge; a 3 ft path drops 0.72 in. Never exceed 2 percent cross slope on an accessible route, since that is the ADA maximum, and keep the slope consistent along the whole run.

Divide the total rise by a comfortable riser height. A 30 in rise needs 5 steps (30 / 7 rounds up to 5), giving an actual riser of 6 in each. With 13 in treads the steps run 5.42 ft horizontally. Outdoors, keep risers between 5 and 7 in and treads 12 to 14 in, and match the step width to the walkway so the proportions stay consistent.

Using the editable defaults in this calculator for a 100 sq ft poured-concrete walkway: materials $600.00 plus a 4 in gravel base ($67.90) = $667.90 as a DIY project. Adding labor at 8 dollars per sq ft ($800.00) brings the project to $1,467.90. These are planning ballparks, not quotes, and rates vary a lot by region, so replace every default with your local numbers before budgeting.