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Gravel Driveway Calculator · Free calculator

20x24 Gravel Driveway Calculator

Covering 20' × 24' (480 sq ft) with 4" of gravel takes 6.52 cubic yards — about 9.13 tons — with 10% extra. A full 3-layer driveway build for 20x24 is 22.81 tons. Depths, layers, truck loads and fabric are below.

Quick answer

4" gravel
6.52 yd³
Weight @ 4"
9.13 tons
3-layer driveway (10")
22.81 tons
Tandem truck loads (15 t)
2
Geotextile fabric
59 sq yd
Est. gravel cost @ 4"
$371

▍Gravel Calculator

Material
ft
in
ft
in
in
Waste Factor
$
L = 24' 0"W = 20' 0"D = 4"
Cubic Yards
6.52yd³
incl. 10% waste · Bulk delivery: order 6.75 yd³
Cubic Feet
176.00ft³
Area
480.0sq ft
Weight
9.13tons
Weight
18,252lbs
Gravel bags needed
  • 0.5 cu ft bag (~50 lb) (0.5 ft³ yield)352

Gravel for 20x24 by depth

480 sq ft, 10% waste. Crushed stone ≈ 1.4 tons/yd³, ~$55/yd³ delivered.

DepthUseCubic yardsTonsTruck loadsBulk est.
2"Top dressing / refresh3.26 yd³4.561$193
4"Top layer (#57 stone)6.52 yd³9.131$371
6"New pad on firm soil9.78 yd³13.691$550
8"New driveway on soft soil13.04 yd³18.252$729

3-layer gravel driveway build for 20x24

The standard US build for a driveway that won’t rut: big stone base, mid-size stone, fines on top.

LayerDepthCubic yardsTons
#3 stone (1"–2½") base4"6.52 yd³9.13
#57 stone (¾"–1") middle4"6.52 yd³9.13
Crusher run / dense grade top2"3.26 yd³4.56
Total10"16.30 yd³22.81

How the math works

  1. Area: 24 ft × 20 ft = 480 sq ft
  2. Volume @ 4": 480 × (4 ÷ 12) = 160.00 cu ft
  3. Add 10%: 160.00 × 1.10 = 176.00 cu ft
  4. Cubic yards: 176.00 ÷ 27 = 6.52 yd³
  5. Tons: 6.52 × 1.4 = 9.13 tons
  6. Truck loads: 22.81 tons ÷ 15 tons per tandem = 2

Trade pro tips

  • At 4" deep, 20x24 takes 9.13 tons — a single dump truck delivery covers it.
  • Build in layers: 4" of #3 (2"–3") stone, 4" of #57, then 2" of crusher run / dense grade on top.
  • Lay non-woven geotextile over clay soil first — it stops stone from sinking.
  • Crown the driveway ½" per foot so water sheds to the sides.
  • Spread with a box blade and compact each layer before the next.

Frequently asked questions

How many tons of gravel do I need for a 20x24 driveway?

At 4" deep: 9.13 tons. At 6": 13.69 tons. A complete 3-layer driveway (4" #3 + 4" #57 + 2" crusher run) is 22.81 tons. All include 10% extra.

How many cubic yards of gravel for 20x24?

2": 3.26 yd³; 4": 6.52 yd³; 6": 9.78 yd³; 8": 13.04 yd³. 20x24 is 480 sq ft.

How many truck loads of gravel for a 20x24 driveway?

A tandem dump truck carries about 15 tons. 20x24 at 4" (9.13 t) is 1 load; the full 3-layer build (22.81 t) is 2 loads.

How much does a 20x24 gravel driveway cost?

Stone alone at 4" is about $371 (~$55/yd³). A 3-layer build runs roughly $896 in material plus 59 sq yd of fabric; delivery and grading are extra.