Mulch Calculator
Estimate mulch in cubic yards and bags for flower beds, tree rings, and landscape areas.
Your Mulch Estimate
- Measure beds - length and width of each area. For irregular shapes, break into rectangles.
- Choose depth - 3 inches is the standard for most garden beds. 2 inches for top-up applications.
- See bags or yards - results show cubic yards plus 2 ft³ and 3 ft³ bag counts - one cubic yard equals 13.5 bags (2 ft³) or 9 bags (3 ft³).
- Keep waste low - 5% is enough for mulch - it doesn't compact like gravel.
- Bags vs. bulk - under 3 yd³ bags may be easier. Above 3 yd³ bulk delivery saves money.
One cubic yard of mulch covers about 108 square feet at 3 inches deep - the standard application - or 162 square feet at 2 inches for a top-up. A typical 200 sq ft bed at 3 inches takes just under 2 cubic yards, which is about 25 of the 2 cu ft bags. Past roughly 2 yards, bulk delivery beats bags on price. Enter your bed dimensions above for the exact yardage and bag count.
How Deep to Mulch
How Much Mulch Do I Need?
Mulch is sold by the cubic yard in bulk or by the bag (2 ft³ or 3 ft³). One cubic yard covers about 108 square feet at 3 inches deep. The standard recommendation for garden beds is 3 inches of mulch - deep enough to suppress weeds and retain moisture, but not so deep that it suffocates plant roots.
For annual top-ups on existing beds, 1 to 2 inches is usually sufficient. Over-mulching (more than 4 inches) can create moisture problems and volcano-mulching around tree trunks causes bark rot. Pull mulch back 3–4 inches from tree trunks and plant stems.
Mulch Types Compared
Choose based on appearance, longevity, and function:
| Mulch Type | Weight per yd³ | Lifespan | Cost/Yard | Notes |
|---|---|---|---|---|
| Shredded hardwood | ~650 lb | 1–2 years | $25–$40 | Most popular - knits together, stays put |
| Pine bark nuggets | ~400 lb | 2–3 years | $30–$45 | Floats in heavy rain - avoid on slopes |
| Cedar mulch | ~500 lb | 2–3 years | $35–$50 | Natural insect deterrent |
| Dyed mulch (black/red) | ~650 lb | 1–2 years | $30–$45 | Color fades in 6–12 months |
| Pine straw | ~80 lb | 6–12 months | $15–$25 | Acidic - great for azaleas, blueberries |
| Rubber mulch | ~1,400 lb | 10+ years | $80–$120 | Playgrounds - doesn't decompose |
Organic mulches decompose and improve soil over time. Plan to replenish every 1–2 years. Non-organic options (rubber, stone) last longer but don't feed the soil.
Mulch Coverage Quick Reference
| Area | 2" Deep | 3" Deep | 4" Deep |
|---|---|---|---|
| 100 ft² | 0.62 yd³ (9 bags) | 0.93 yd³ (13 bags) | 1.23 yd³ (17 bags) |
| 250 ft² | 1.54 yd³ (21 bags) | 2.31 yd³ (31 bags) | 3.09 yd³ (42 bags) |
| 500 ft² | 3.09 yd³ (42 bags) | 4.63 yd³ (63 bags) | 6.17 yd³ (84 bags) |
| 1,000 ft² | 6.17 yd³ (84 bags) | 9.26 yd³ (125 bags) | 12.35 yd³ (167 bags) |
Bag count based on 2 ft³ bags, rounded up to whole bags. These are base quantities - add about 5% for settling and edges. One cubic yard = 13.5 bags (2 ft³) or 9 bags (3 ft³).
Bags to Cubic Yards Conversion
| Number of Bags | 2 ft³ bags = yd³ | 3 ft³ bags = yd³ |
|---|---|---|
| 10 bags | 0.74 yd³ | 1.11 yd³ |
| 20 bags | 1.48 yd³ | 2.22 yd³ |
| 30 bags | 2.22 yd³ | 3.33 yd³ |
| 40 bags | 2.96 yd³ | 4.44 yd³ |
| 50 bags | 3.70 yd³ | 5.56 yd³ |
| 60 bags | 4.44 yd³ | 6.67 yd³ |
| 80 bags | 5.93 yd³ | 8.89 yd³ |
| 100 bags | 7.41 yd³ | 11.11 yd³ |
Formula: bags × bag size (ft³) ÷ 27 = cubic yards. Bulk mulch is sold by the cubic yard - use this table to compare bag vs bulk pricing.
Formulas
Simple volume math:
Cubic yards = Volume ÷ 27
2 ft³ bags = Volume (ft³) ÷ 2
3 ft³ bags = Volume (ft³) ÷ 3
Mulch is light and doesn't compact significantly. A 5% waste factor covers most situations.
Mulch cost by type (2026 US prices)
| Mulch type | Per cubic yard bulk | Per bag (2 cu ft) | Best use |
|---|---|---|---|
| Shredded hardwood (natural) | $25-$45 | $4-$7 | General beds, trees, shrubs |
| Dyed hardwood (black, red, brown) | $30-$55 | $4-$8 | Decorative beds, curb appeal |
| Cedar or cypress | $35-$65 | $6-$10 | Natural pest resistance, longevity |
| Pine bark nuggets | $30-$55 | $5-$9 | Acid-loving plants, slopes |
| Pine straw | $25-$40 | $5-$8 per bale | Southern US, slopes, natural areas |
| Rubber mulch | $80-$160 | $8-$15 | Playgrounds, permanent low-maintenance |
A full truckload (15 yd3) costs $375-$975 depending on type and region. Installation labor adds $30-$50/hr for spreading. One cubic yard covers 160 sq ft at 2 in deep or 108 sq ft at 3 in deep. Dyed mulch needs 1-2 dry days to cure after spreading - avoid rain during that window.
Related Calculators
After You Know Your Yardage
Mulch usually lands after the bed itself is in shape. From here:
Mulch works best over a prepared topsoil base. Browse our full landscaping calculator collection for topsoil, compost, and sod.