How Much Do I Need?

Mulch Calculator

How much mulch do I need?

Enter the size of the bed and how deep you want the mulch. The calculator works out the volume, adds a small allowance, and tells you how many bags to buy or how much to order in bulk.

Units
Area to cover

Beds are commonly mulched 2–3 in (5–7.5 cm) deep.

For L-shaped or irregular spaces, split them into rectangles and add each one.

Buying

Check the bag. 2 ft³ is a common US size; metric bags are sold in litres.

For uneven ground and settling. Set to 0 for the exact amount.

Cost (optional)

Add the price to see an estimated total.

Results update as you type.

Your estimate

Mulch to buy

27 bags

2 ft³ bags, or 2 yd³ in bulk. That covers 1.94 yd³ (52.5 ft³) including 5% extra.

Estimated amount to buy

Bags (2 ft³ each)
27 bags
Or in bulk
2 yd³
Volume with 5% extra
1.94 yd³ (52.5 ft³)

Calculated quantity (no extra)

Area covered
200 ft²
Cubic yards
1.85 yd³
Cubic feet
50 ft³
Cubic metres
1.42 m³
Litres
1,416 L
How this was calculated
  1. Area = 20 ft × 10 ft = 200 ft²
  2. Volume = 200 ft² × 3 in deep = 50 ft³ = 1.85 yd³ (27 ft³ per yd³)
  3. With 5% extra = 50 ft³ × 1.05 = 52.5 ft³
  4. Bags = 52.5 ft³ ÷ 2 ft³ per bag = 26.25, rounded up to 27
  5. Bulk = 1.95 yd³, rounded up to the next quarter cubic yard = 2 yd³
  • Fresh mulch settles and breaks down over a season, so beds are often topped up each year rather than refilled.

How the mulch calculation works

  1. Area = length × width of the bed.
  2. Volume = area × depth, with every measurement converted to the same unit first (3 inches is 0.25 ft; 7.5 cm is 0.075 m).
  3. Add extra: volume × (1 + extra ÷ 100).
  4. Bags = volume including extra ÷ bag size, rounded up.

One cubic yard is 27 cubic feet (3 ft × 3 ft × 3 ft), or about 0.765 m³. One cubic metre is 1,000 litres. So a cubic yard of mulch is about 13.5 bags of 2 ft³.

Bags or bulk?

Bags are easy to carry and store. For larger areas, mulch delivered loose by the cubic yard (or cubic metre) usually means far fewer trips. Suppliers set their own minimum orders and increments, so the bulk figure here is rounded up to the next quarter unit as a starting point. Check before you order.

How deep should mulch be?

Garden guides commonly recommend about 2–3 inches (5–7.5 cm) for planting beds, with a little more on paths or where you want to suppress weeds. Deeper isn't always better. Keep mulch pulled back a few inches from plant stems and tree trunks. If you are topping up an existing layer, enter only the depth you are adding.

Rounding rules

  • Bags are rounded up to a whole bag.
  • Bulk amounts are rounded up to the next 0.25 yd³ (US) or 0.25 m³ (metric).
  • The mathematical volume is shown separately, before any extra or rounding.