Enter the size of your beds and the depth you want. The calculator turns the coverage of one bale into the number of pine straw bales to buy, plus how many you need each year to top it up.
How to use the pine straw calculator
- Choose a rectangle or a circle and enter the size of the bed. For an L-shaped or curved bed, split it into rectangles and add the results.
- Enter the depth. Use 3 in for a new bed and 1 in for a yearly refresh.
- Check the coverage printed on the bale or the supplier’s page. About 50 ft² at 3 in is typical for a longleaf bale.
- Add a few percent extra for curved edges and slopes, and enter a price per bale for a cost.
Pine straw formula
Coverage per bale at your depth = coverage at 3 in × (3 ÷ depth in inches) Bales = area (ft²) ÷ coverage per bale × (1 + extra %), rounded up Yearly top-up (1 in) = area ÷ (coverage at 3 in × 3), rounded up
A bale covers a fixed volume of straw, so halving the depth doubles the area it covers. Georgia Pine Straw rates its bales at about 50 square feet at 3 inches thick, which is the default here.
Worked example: 1,000 ft² of beds, 3 in deep
- Coverage at 3 in: 50 ft² per bale.
- Bales: 1,000 ÷ 50 = 20 bales.
- At 2 in deep, one bale covers 50 × 3 ÷ 2 = 75 ft², so the same beds take 1,000 ÷ 75 = 13.3, or 14 bales.
- Yearly top-up of 1 in: 1,000 ÷ 150 = 6.7, or 7 bales.
Pine straw bales by area and depth
With 50 ft² per bale at 3 in, rounded up to whole bales:
| Area | 2 in deep | 3 in deep | 4 in deep |
|---|---|---|---|
| 100 ft² | 2 | 2 | 3 |
| 250 ft² | 4 | 5 | 7 |
| 500 ft² | 7 | 10 | 14 |
| 1,000 ft² | 14 | 20 | 27 |
| 2,000 ft² | 27 | 40 | 54 |
| 5,000 ft² | 67 | 100 | 134 |
How much does a bale of pine straw cover?
Georgia Pine Straw says one of its longleaf bales covers about 50 square feet at 3 inches. Mountain High Mulch, which delivers around Atlanta, gives a wider range of about 35 to 50 square feet at 2 to 3 inches, and notes that longleaf bales are denser and go a bit further than slash pine bales. Bales vary in size from one supplier to the next, so enter the coverage your supplier quotes.
How deep should pine straw be?
Mountain High Mulch recommends 2 to 4 inches, because pine straw settles and packs down more than bark mulch. Georgia Pine Straw starts new beds at 3 inches and suggests adding about 1 inch a year, a third of the first layer, to keep the color and coverage up. Keep straw a few inches away from tree trunks and the siding of the house.
Longleaf or slash pine straw?
Longleaf needles are longer, so a bale holds more straw and the needles knit together into a mat that stays put on slopes. Slash pine needles are shorter and the bales are often a little smaller. If your supplier sells both, compare the price per square foot covered, not the price per bale: divide the price of a bale by its coverage.
Tips for buying pine straw
- Buy a few spare bales. Bales differ in size, and an extra bale is cheaper than a second trip.
- Fluff the bale as you spread. Pull the flakes apart and shake them out so the needles lie loose and even.
- Tuck the edges. Push the straw down along walks and lawn edges with a rake for a clean line.
- Top up once a year. A thin new layer in spring is enough once the first layer is down.
Questions
How many bales of pine straw do I need?
Divide the area of your beds in square feet by the coverage of one bale. At about 50 ft² per bale at 3 inches, 1,000 ft² takes 20 bales, and 2,000 ft² takes 40.
How many bales of pine straw for 1,000 square feet?
About 20 bales at 3 inches deep and 14 bales at 2 inches, if a bale covers 50 ft² at 3 inches.
How many square feet does a bale of pine straw cover?
Roughly 35 to 50 ft² at 2 to 3 inches deep, depending on the bale size and the type of needle. Longleaf bales usually cover the most.
How often should pine straw be replaced?
You rarely need to remove it. Add about an inch of fresh straw each year as the old layer breaks down, which is roughly a third as many bales as the first application.
Sources
- Why Georgia Pine Straw?, Georgia Pine Straw.
Used for: One bale covers about 50 ft² at 3 in; a yearly top-up of about 1 in, a third of the first layer. - How to Measure Your Property for Mulch and Pine Straw, Mountain High Mulch.
Used for: About 35–50 ft² per bale at 2–3 in; 2–4 in recommended depth; longleaf bales go further than slash. - NIST Guide to the SI, Appendix B.8: Factors for units listed alphabetically, National Institute of Standards and Technology.
Used for: Exact inch and foot definitions; square metre conversions.