Mulch & Rock Calculator

How to Calculate Mulch Coverage

The formula for calculating mulch or rock is straightforward:

1. Measure your bed — length (ft) x width (ft) = square footage.
2. Choose your depth — convert inches to feet by dividing by 12.
3. Calculate cubic feet — square footage x depth in feet.
4. Convert to cubic yards — divide cubic feet by 27 (there are 27 cubic feet in a cubic yard).

For example: a 12 ft x 4 ft bed at 3 inches deep = 48 sq ft x 0.25 ft = 12 cubic feet = 0.44 cubic yards. Our calculator handles the math for you and rounds up so you do not run short.

Mulch Depth Guide

• 2-3 inches — ideal for flower beds, perennial gardens, and around shrubs. Suppresses weeds while allowing water through.
• 3-4 inches — best for pathways, play areas, and high-traffic zones. Provides better weed control and longer-lasting coverage.
• 1-2 inches — sufficient for decorative stone and rock around established plants or as a top-dress.

Avoid piling mulch deeper than 4 inches, as it can suffocate plant roots and trap too much moisture. Keep mulch 2-3 inches away from tree trunks and plant stems.

Rock vs Mulch in the Okanagan

Both rock and mulch work well in the Okanagan's semi-arid climate, but they serve different purposes:

• Mulch — breaks down over 1-2 years, adding nutrients to the soil. Great for flower beds and gardens. Needs replenishing annually. Retains moisture well in our dry summers.
• Rock — permanent, low-maintenance, and fire-resistant (important in the Okanagan). Best for xeriscaping, drainage areas, and decorative features. Can reflect heat, so avoid around heat-sensitive plants.
• Best of both — many Okanagan homeowners use mulch in garden beds and rock in pathways, borders, and dry creek features.

Need advice on what works best for your property? Cool Runnings handles mulch, drainage rock, and decorative stone installation across the Okanagan Valley. Call Ramoy at (250) 307-9220 for a free consultation.