🍂Mulch Calculator PRO
Bulk yards or bags from bed area and depth — with cost comparison.
Dimension Diagram — updates as you type
One cubic yard covers about 100 sq ft at 3 inches — the most useful landscaping fact there is.
1 Bed Area & Depth
3 in is the sweet spot for weed suppression. 1 cu yd covers ~100 sq ft at 3 in.
2 Pricing & Labour
Results
Material Quantities
Cost Breakdown
⚠️ Pre-Export Checklist
- All beds measured (circles via πr²)
- Depth checked with a ruler, not eyeballed
- Bulk wins confirmed above ~3 yards
- Mulch kept off trunks and stems
How to Calculate Mulch Needed
Show formula and worked example ▼
Formula
Cubic yards= Area (sq ft) × Depth (in) ÷ 324 × (1 + waste)
Bags= Cubic feet ÷ bag size (2 cu ft bark, 0.8–1.5 cu ft rubber)
Worked Example
100 sq ft at 3 in: 100 × 3 ÷ 324 = 0.93 cu yd→ order 1 yard, or 13 bags.
Common Mistakes to Avoid
- Mulch volcanoes against tree trunks
- Eyeballing depth across large beds
- Buying bags for multi-yard jobs
- Forgetting 10–20% settling
Drag to rotate — Scroll to zoom
Calculateurs Liés
Frequently used together on the same project.
Client & Quote (prints on PDF & Excel)
Adjustments (applies to exports)
Contingency is added as a separate line on the exported cost summary. Waste % is printed as an advisory reminder.
Project notes (prints on PDF & Excel)
Result compare (A/B)
| Item | Pinned | Current | Change |
|---|---|---|---|
Saved rates auto-apply from your Price Library. Advanced details stay in your browser — nothing is uploaded except inside your own PDF/Excel exports.
Nothing deflates a Saturday like the third trip to the garden center because the beds drank more bark than you guessed. Our free mulch calculator converts bed area and depth into bulk cubic yards and 2-cubic-foot bag counts, plus cost either way — so you can decide up front whether delivery or bags win.
Enter the total bed area in square feet and the mulch depth in inches (3 inches is the sweet spot for weed suppression without suffocating roots). Add your bulk price per cubic yard and bag price. Results show cubic yards, bags, and both costs side by side. The rule of thumb baked in: one cubic yard covers about 100 square feet at 3 inches deep.
📖 Comment Utiliser Ce Calculateur
Step 1: Measure Bed Area
Measure each bed length times width in feet and add them. For circles, use 3.14 × radius × radius.
Step 2: Choose Depth
Use 3 inches for weed control in established beds, 4 to 6 for new playground or slope areas. Never exceed 4 inches against tree trunks.
Step 3: Compare Bulk vs Bags
Enter both prices. Bulk wins above roughly 3 to 4 cubic yards; bags win for top-ups under a yard.
Step 4: Order
Round bulk orders up to the half yard — piles settle, and the leftover top-dresses the thinnest bed.
📐 Comment Le Volume Est Calculé
Cubic feet = area (sq ft) × depth (in) ÷ 12, then cubic yards = cubic feet ÷ 27 — combined as area × depth ÷ 324. Bags are 2 cubic feet each: bags = cubic feet ÷ 2, rounded up. A 100 sq ft bed at 3 inches needs 25 cubic feet — just under one cubic yard, or 13 bags.
⚠️ Erreurs Courantes à Éviter
Mulch volcanoes around trees
✓ Keep mulch 3 to 6 inches from trunks. Piled bark traps moisture against bark and invites rot and rodents.
Eyeballing depth
✓ An inch of error across 500 sq ft swings the order by 1.5 cubic yards. Stick a ruler in the existing bed before ordering.
Buying bags for big jobs
✓ Above 3 to 4 yards, bulk delivery is usually half the per-yard cost of bags — plus no plastic to haul away.
Forgetting settling
✓ Fresh bark settles 10 to 20 percent in the first month. Order the full depth, not the settled depth.
💡 Conseils Professionnels
Lay cardboard or landscape fabric under new beds to double weed suppression.
Water mulch after spreading to knit it together against washouts.
Top-dress, do not replace: an inch of fresh mulch yearly beats a full tear-out.
Dyed mulches fade in full sun — natural bark ages more gracefully on south beds.
❓ Questions Fréquentes
100 × 3 ÷ 324 = 0.93 cubic yards — order 1 yard, or 13 two-cubic-foot bags.
2 to 3 inches for established beds, up to 4 for new plantings. Keep it shallow near stems and trunks.
Bulk is usually far cheaper per yard above 3 to 4 cubic yards. Bags make sense for top-ups under one yard.
Top-dress yearly with an inch. Full replacement is rarely needed unless drainage or weed fabric failed.
🏗️ Applications Réelles
Mulch math covers flower beds, tree rings, playground safety surfacing, slope erosion control, and commercial landscapes. Landscapers bidding maintenance contracts run these numbers per property, while homeowners use the bag count to decide whether the SUV makes one trip or two. Fall is prime time — beds mulched before winter hold moisture and suppress spring weeds.
Our free mulch calculator converts bed area and depth into bulk cubic yards, bag counts, and cost. Use it for flower beds, tree rings, playgrounds, and slopes with 2-cubic-foot bag math. Enter area and depth for an instant bulk-vs-bags comparison.
✅Method, Sources & Review
Maintained by theBuildingCalc methods desk· Last reviewedSeptember 23, 2026. This calculator implements the standards and references below; every figure can be rechecked against the formulas and worked example on this page.
Results are estimates, not engineering advice. Verify against local codes and licensed professionals for structural, electrical, and gas work. See ourTerms. Spotted an error? Report it— corrections ship with the next review.