Mulch Depth & Coverage Guide

By Vinod Kondeti · Updated October 14, 2026

Depth is the biggest factor in how far your mulch goes. Every bag covers (bag cu ft × 12) ÷ depth in inches square feet, so halving the depth doubles the coverage. Scotts recommends 3 inches for its standard mulch, which it says helps block weeds, and 2 inches for its finer Triple Shred.

Bag size (ft³)Depth (in)Number of bags (bags)

Area one bag covers (ft²)	–
Area all bags cover (ft²)	–
Area 1 yd³ covers (ft²)	–

Working: –

How do I measure for a depth & coverage project?

A 2 cu ft bag covers 24 ft² at 1 in, 12 ft² at 2 in, 8 ft² at 3 in and 6 ft² at 4 in.
Already have mulch down? Measure the existing layer and only add the difference.
Follow the depth on your product's label first, then use this page to plan the quantity.

How is the depth & coverage amount calculated?

Cubic feet = length × width × (depth in inches ÷ 12)
Cubic yards = ft³ ÷ 27
Bags = ft³ ÷ bag size (ft³), rounded up
One bag covers (bag ft³ × 12) ÷ depth (in) square feet; 1 yd³ covers 324 ÷ depth (in) ft²
Extra for waste/settling: volume × (1 + % ÷ 100)
Round bed: π × (d ÷ 2)²; tree ring: π ÷ 4 × (outer² − inner²)
Bulk cost = yd³ × $/yd³ + delivery; bag cost = bags × $/bag

Depth & coverage calculator questions

How much does a 2 cu ft bag of mulch cover?

At 3 inches, 8 ft². At 2 inches, 12 ft².

How deep should mulch be?

Scotts recommends 3 inches for its standard mulch and 2 inches for Triple Shred. Check your product label.

Sources

Estimates only. Use the coverage or bag size printed on your product. Read the mulch guide for worked examples.