Mulch Calculator
Bags or a bulk pile — the same volume priced both ways, with the exact bed size where the cheaper route changes.
Mulch Calculator
Results recalculate instantly on every keystroke. Nothing you type is transmitted.
What this result does not account for
- Flat-fee delivery model — no per-mile or fuel surcharges.
- No labor: spreading and the barrow are on you.
- Bag size is free-entry; pallet pricing is not modeled.
In short: A 40 × 3 ft bed at 3 in needs 1.111111 yd³ — 15 two-cubic-foot bags, $60.00. The same yards delivered bulk round to 1.25 yd³ for $135.00, so bags win by $75.00. The fork sits at exactly 12.5 yd³: past a 1,350-ft² bed, the pile takes over.
Formula
yd³ = ft² × in ÷ 324
bags = ⌈ft³ ÷ bag size⌉ (13.5 two-ft³ sacks per yard)
bulk total = yards (rounded to ¼) × rate + delivery fee
crossover = fee ÷ (bags-per-yard × bag price − bulk rate)
[('324', 'one yard × one inch, in square feet — exact'), ('the fee', 'the yard’s flat drop charge, paid once'), ('crossover', 'the bed size where the cheaper route changes'), ('depth', '2-4 in covers; deeper suffocates, not protects')]
Worked Example
- Volume the bed by the 324 law and count sacks at your bag size.
- Price the bag route to the cent.
- Round the yardage up to the quarter and add the drop fee.
- Declare the winner and the dollars between them.
- Solve the crossover bed where the routes swap.
The 40 × 3 ft bed at 3 in: 1.111111 yd³ = 15 two-ft³ bags = $60.00. Delivered, 1.25 yd³ × $48 + $75 = $135.00 — bags win by $75.00. The fork sits at 12.5 yd³: past a 1,350-ft² bed at 3 in, the pile takes over at these prices.
Strengths & Limits Of This Model
Where this engine is strong
- The bag/bulk crossover solved, not guessed
- Coverage tied to depth by the exact 324 law
- Both routes priced to the cent on your quotes
Where it stops
- No spreading labor in either route
- Single flat delivery fee
Practical Use Cases
Spring refresh
Beds and tree rings priced bag-vs-pile.
New beds
Depth chosen once, honestly, at 2-4 inches.
Bulk quotes
Yardage to the quarter before you call.
Bag runs
Sack counts you can actually load.
Price moves
How the fork shifts with local quotes.
Methodology & Editorial Standards
Volume follows the exact 324 law (ft² × in ÷ 324 = yd³). Bags are the ceiling of cubic feet over bag size; bulk rounds the yardage up to the quarter-yard, then adds the flat delivery fee once. The crossover solves fee = yards × (bags-per-yard × bag price − bulk rate) and disappears honestly when bags cost less per yard or no fee exists. Depths above 24 in are refused as typos.
Computation runs in IEEE-754 double precision at full internal precision; rounding to two decimal places occurs strictly at the display layer, so no cumulative drift enters the result. All monetary outputs use accounting presentation — grouped thousands, two decimals, negatives in parentheses — so figures can be transcribed directly into a model or working paper. Division-by-zero and out-of-domain inputs return an em-dash rather than a misleading number.
This engine was reconciled against an independent reference implementation and hand-verified for the worked example above before release. Our full five-stage review process is published on the About Us page.
Disclaimer. This calculator is provided for informational and modelling purposes only and does not constitute financial, tax, legal, medical, or engineering advice. Verify all figures with a qualified professional before acting on them.
Mulch Calculator — 10 Expert FAQs
10 analyst-written answers to the questions practitioners actually ask — optimised for voice and answer-engine retrieval.
How many 2-cubic-foot bags of mulch are in a yard?
Exactly 13.5. A cubic yard is 27 cubic feet, so 27 ÷ 2 = 13.5 — order 14 and carry one home half-empty. The 3-ft³ sacks run 9 to the yard; 1.5-ft³ run 18.
How much does a cubic yard of mulch cover?
It depends entirely on depth, by the 324 law: 324 ft² at 1 inch, 162 at 2 inches, 108 at 3. A coverage figure without a depth attached is meaningless.
How deep should mulch be?
Two to four inches, with 2-3 the working band for established beds. Deeper is not better: past about 4 inches mulch suffocates shallow roots and sheds light rain. A 1-inch top-dress refreshes color without burying anything.
Is bulk mulch cheaper than bags?
Usually dramatically — roughly $30-65 a yard bulk against $3-4 a 2-ft³ bag, which is $81-108 a yard bagged. The flat delivery fee ($50-150, often a 2-4 yard minimum) is what keeps small jobs on bags. The crossover here sits at 12.5 yards at reference prices.
What does dyed mulch cost versus hardwood?
Hardwood and pine bark are the cheapest bulk mulches; dyed and premium blends run a step higher; rubber mulch is in another class at $120-180 a yard. Enter your local quote — the fork moves with it.
How many bags fit in a pickup?
The 2-ft³ sacks weigh around 20-40 lb depending on moisture, so most trunks take 6-10 safely. That is under half a yard per run — the real cost of bags is the driving, which this page does not price.
Does mulch need a refresh every year?
Natural mulch breaks down from the top, losing roughly an inch a season to decay and compaction. That is a feature — it feeds the soil — but it means a 1-2 inch top-up each spring, not a full re-build of the depth.
Should landscape fabric go under mulch?
Under trees and shrubs it can, but in planting beds the mulch itself is the weed layer once it settles. Fabric under annual beds frustrates every later dig. Keep depth honest and the weeding easy instead.
How do I compare a bagged and bulk quote honestly?
Convert both to dollars per cubic yard: bags — 27 ÷ bag size × bag price. Bulk — price + delivery fee ÷ yards delivered. This page runs both conversions live and shows the bed size where the answer changes.
When is the cheapest time to buy mulch?
Yards price by season and by load: spring is the peak, and many suppliers discount late-fall deliveries. The fork math on this page works on whatever quote you bring it.