Landscaping
Mulch Calculator — Bags vs Bulk Cost Canada
Enter bed dimensions, depth, bag volume, supplier bulk increment, and optional prices to compare rounded bag and bulk material orders.
Formula tested · Local units · No sign-up
Project inputs
Enter measurements
Use your preferred units. Results update automatically.
Show the calculation methodFormula, conversions, rounding, and assumptions+
Volume = bed area × depth, converted to metres before multiplying — a 7.5 cm layer on a 12 m² bed is 12 × 0.075 = 0.9 m³ (900 litres).
Canadian garden centres sell mulch both in litre bags and in cubic-foot bags (2 cu ft ≈ 56.6 L), plus bulk by the cubic yard or cubic metre — so check your product's stated size and enter it. Bag counts round up to whole bags.
Real-world example
Worked example: 4 m × 3 m bed, 7.5 cm deep
- Area: 4 × 3 = 12 m².
- Convert depth: 7.5 cm = 0.075 m.
- Volume: 12 × 0.075 = 0.9 m³.
- Add 5% wastage: 0.9 × 1.05 = 0.945 m³ = 945 litres.
- Bags: 945 ÷ 50 = 18.9, rounded up to 19 bags of 50 L.
- At an entered 0.25 m³ increment, 0.945 m³ rounds to a 1.0 m³ bulk order.
The purchase choices are 19 bags of 50 L or 1.0 m³ at the example bulk increment. Enter comparable supplier prices and the applicable GST/HST basis before comparing.
Before you start
How to measure
- Measure beds in metres or feet — the calculator converts either; just keep each measurement's unit selector correct.
- Choose depth by job: 5 cm (about 2 inches) tops up existing beds, 7–10 cm (3–4 inches) suits new beds and weed control.
- For beds along a curved walkway, approximate with rectangles, add the areas, and use the total-area mode.
Local guidance
Notes for Canada
- Canadian bag sizes mix systems: some products are labelled in litres, others in cubic feet (2 cu ft ≈ 56.6 L) — convert or edit the bag-size field to match your product.
- Bulk mulch from landscape depots may be quoted per cubic yard or per cubic metre; the calculator shows the total in m³ and litres so you can compare either way.
- Sales tax is 5% GST plus provincial tax or a combined HST depending on the province; shelf prices usually exclude it.
Quick reference
Mulch depth quick reference (typical planning values)
| Application | Common depth |
|---|---|
| Annual top-up of existing beds | 3–5 cm (1–2 in) |
| General beds and borders | 5–8 cm (2–3 in) |
| New beds / weed suppression | 8–10 cm (3–4 in) |
| Around trees (clear of trunk) | 5–10 cm (2–4 in) |
Planning values only — over-mulching holds excess moisture against stems.
Good to know
Common mistakes to avoid
- Entering a bag labelled in cubic feet as if it were litres — a 2 cu ft bag is about 56.6 L, not 2 L.
- Mixing feet and metres in the same calculation without setting each field's unit.
- Skipping wastage: mulch settles after the first rain, so 5% extra is a sensible buffer.
- Comparing a per-cubic-yard bulk quote against a per-cubic-metre one without converting (1 yd³ ≈ 0.765 m³).
Need help?
Frequently asked questions
How many litres is a 2 cubic foot bag?
About 56.6 litres (1 cubic foot = 28.32 L). If your bags are labelled in cubic feet, enter 56.6 in the bag-size field for a 2 cu ft bag.
How much mulch for a 15 m² bed at 7.5 cm?
15 × 0.075 = 1.125 m³. With 5% wastage that's 1.181 m³ ≈ 1,181 litres, which is 24 bags of 50 L (1,181 ÷ 50 = 23.6, rounded up).
Is a cubic yard of bulk mulch more than a cubic metre?
No — it's less. A cubic yard is about 0.765 m³, so a per-yard price needs to be about 31% higher than a per-metre price to be equivalent. The calculator's m³ total lets you compare both quotes.
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About this calculator
- Written by:
- BuildMeasure Editorial Team
- Technically reviewed by:
- Pending independent technical reviewer (formula unit-tested; see methodology)
- Last reviewed:
- 2026-07-20
- Formula version:
- 1.1.0
- Region reviewed for:
- Canada
- Spotted an error?
- Report a correction
Methodology
- Volume is computed as bed area × depth. You can enter the area directly or as length × width; either way all inputs are converted to SI units (metres) before any arithmetic to avoid unit drift.
- The wastage allowance is applied to the exact volume to cover settling and uneven spreading.
- Bag counts divide the total volume by the bag size you enter and round UP to whole bags, because you can't buy a fraction of a bag. The default bag size is a clearly-labelled common retail size (2 cubic feet in the US, 50 litres elsewhere) and is fully editable.
- Bulk order = allowance-adjusted volume rounded UP to the exact supplier increment you enter. Bulk-increment rounding is reported separately from the spreading allowance.
- Bag and bulk material totals use their independently rounded purchase quantities and only the prices and tax rate you enter. No current prices, delivery fee, or universal bulk increment is built in.
- The formula is covered by automated unit tests, including hand-calculated worked examples, and is versioned (see formula version on this page).
Sources & standards
- Unit definitions: 1 ft³ = 28.316846592 L and 1 yd³ = 0.764554857984 m³ (exact definitions).
- Bag sizes: 50 L is used as an editable default; Canadian retail also sells cubic-foot bags — check your product.
This tool provides a material estimate and entered-price comparison for planning only. It is not a quotation. Bag sizes, loose volume, moisture, compaction, minimum loads, sale increments, delivery, access, and product quality vary. Confirm quantities, package volumes, bulk units, and all charges with the supplier before buying.