How much mulch do I need for a 20 by 8 foot bed?

At a supplied depth of 3 inches, a 20 by 8 foot bed takes exactly 40 cubic feet: approximately 1.48 cubic yards and 1.13 cubic metres, or exactly 20 bags if each holds 2 cubic feet. At an illustrative 2 inches it takes about 26.67 cubic feet, 0.99 cubic yards and 14 of those bags; at 4 inches, about 53.33 cubic feet, 1.98 cubic yards and 27 bags. These examples compare quantities and do not select a suitable depth. The exact rectangle calculation is 160 square feet times 3/12 feet of depth, then divide the full volume by the bag capacity and round the bag count up.

How deep should mulch be laid?

Type the depth you have chosen from information relevant to your material and bed. The 2, 3 and 4 inch buttons load examples for comparing quantities; they do not recommend a depth. The field also accepts positive decimals, fractions or scientific notation, with inches or centimetres selected separately. The calculator does not assess plants, trunks, moisture, weeds or playground requirements.

How many 2 cubic foot bags are in a cubic yard of mulch?

A cubic yard is exactly 27 cubic feet. Dividing by a supplied 2 cubic foot bag capacity gives 13.5, rounded up to 14 whole bags. A 3 cubic foot bag gives exactly 9; a 1.5 cubic foot bag gives 18; a 1 cubic foot bag gives 27. These are arithmetic examples, not statements about any particular brand. The equivalent forward worked case is 108 square feet at 3 inches deep, producing exactly one cubic yard. The page takes bed dimensions or known area and depth; it has no direct volume-to-bag or inverse coverage mode.

Does the calculator know what size bags my supplier sells?

Use the capacity printed on your own bag and select cubic feet, litres or cubic metres. The initial 2 cubic foot value is an editable example and does not identify your supplier or product. Current quantities and the three worked cases all recompute using your supplied bag capacity. Whole bag counts use the full exact rectangle or known-area volume before display rounding. A circle bag range means the numerical bound for pi crosses a whole-bag boundary.

Can I measure the bed in metres instead of feet?

Yes. Choose Metres for the length, width, diameter or a genuine known-area field in square metres. Select Centimetres for depth and litres or cubic metres for bag capacity if required. The answer includes cubic yards, cubic feet and cubic metres together. A 6 by 2.4 metre bed at 3 inches takes exactly 1.09728 cubic metres, displayed as 1.10 cubic metres, 38.75 cubic feet and 1.44 cubic yards, with 20 bags of 2 cubic feet. Unit changes preserve the same measurement as an exact decimal or complete fraction; they do not round it to four decimal places. Exactly 2, 3 and 4 inches are 5.08, 7.62 and 10.16 centimetres.

How do I work out a round bed or a tree ring?

Choose Circle and enter the diameter measured across the centre. Area is pi times half the diameter squared. A supplied 12 foot diameter at 3 inches deep takes 9 pi cubic feet, approximately 28.27 cubic feet and 1.05 cubic yards, with 15 bags of 2 cubic feet. Circle decimal results are marked approximate and retain rational bounds. This page does not calculate an annulus or tree ring with an inner gap, and subtracting two separately rounded bag counts does not give its combined whole-bag count.

Is anything uploaded, and does it cost anything?

The arithmetic runs in your browser and the bed measurements are not uploaded. No account is needed for the core calculation. Saved settings restore without being rewritten; valid deliberate edits save in this browser and invalid drafts leave saved settings intact. Unknown and unusable saved records are preserved until you deliberately use Forget saved settings. The page computes supplied quantities and has no price, supplier, delivery or installation total. Site measurement may record allowed aggregate interactions and completions according to your privacy preferences, without the measurements or results.

Can I enter square feet or square metres that I already know?

Choose Known area and enter the measured area in the selected square feet or square metres. Supply the depth and bag capacity separately. Exactly 100 square feet at 3 inches takes 25 cubic feet and 13 bags of 2 cubic feet. Exactly 10 square metres at 10 centimetres takes one cubic metre and 20 bags of 50 litres. A square-yard input unit is not provided.

What do the approximation and abbreviation marks mean?

Decimal volumes round to two places. A tiny positive quantity is shown below the half-step instead of zero. The approximate mark identifies a circle calculation using a 100-place bound for pi; if its bag ceilings differ, the page prints their range. An ellipsis on a large quantity abbreviates it for the stage. Open Complete selectable calculation for all digits, exact fractions, symbolic circle coefficients and rational bounds.

Mulch Calculator

Type the bed and the depth you are spreading and read the mulch in cubic yards, cubic feet, cubic metres and bags at once, with the arithmetic printed under the answer. Enter rectangular dimensions, a circle diameter or a known area, your chosen depth and the volume printed on your own bag. Feet or metres, inches or centimetres, and cubic foot, litre or cubic metre bags can be selected independently. A 20 by 8 foot bed at 3 inches is exactly 40 cubic feet and 20 bags of 2 cubic feet. The initial bag capacity and depth buttons are editable examples. Rectangle and known-area quantities are exact; circles retain a bound for pi and are marked approximate. Complete selectable working shows the full quantities and any uncertain circular bag boundary.

What you need20 ft by 8 ft at 3 in

Cubic yards1.48

40.00 cu ft · 1.13 m³20 bags at 2 ft³, rounded up

14.86 m² × 3 in = 1.13 m³; bag division uses the full volume.

Supply your measured bed or known area, your chosen depth and the volume printed on your bag. The initial 2 ft³ bag and 2, 3 and 4 inch depth buttons are editable examples. Metres, centimetres and litre bags can be selected together. Unit changes preserve the question as exact decimals or fractions. Results round to two decimal places; ≈ marks a circle approximation and … marks an abbreviation. Complete values are below.

Complete selectable calculation

Mulch Calculator - supplied single-layer quantity estimate
Geometry: rectangle; 20 ft by 8 ft at 3 in
Supplied bag capacity: 2 ft³
Area: exact 14.8644864 m² (1161288/78125)
cubicMetres: exact 1.13267386368 m³ (55306341/48828125)
cubicFeet: exact 40 ft³ (40)
cubicYards: exact 40/27 yd³ (40/27)
Whole bags: 20
A single layer from your measured dimensions or known area, your chosen depth and your supplied bag volume. The 2, 3 and 4 inch buttons load examples; they do not choose a suitable depth or identify a product.
Rectangle and known-area arithmetic and unit conversions are exact. Circle area and volume are π times the stated coefficients; decimal displays use a 100-place bound for π and are approximate.
Bag counts round up from the full volume before display rounding. A range means the π bound straddles a whole-bag boundary. Abbreviated large results have complete values below.
No settling, compaction, weight, installation, delivery, material suitability or playground specification is inferred. Bag capacities and horticultural decisions come from your own supplied information.

A 20 by 8 bed20 ft by 8 ft, 3 inches deep
1.48 cu yd, 20 bags of 2 ft³
The same bed at 4 in20 ft by 8 ft, 4 inches deep
1.98 cu yd, 27 bags of 2 ft³
A 12 ft circle12 ft diameter, 3 inches deep
≈ 1.05 cu yd, 15 bags of 2 ft³

Supplied quantities and complete working. Rectangle and known-area calculations use exact arithmetic without rounding until the last step. Circles use a 100-place bound for pi and have approximate decimal results. Whole bags round up from the full supplied volume; an uncertain circle boundary shows a bag range. Settling and actual bag contents are not inferred. Open the complete calculation for exact quantities, circle bounds and the assumptions used.

Common questions

How much mulch do I need for a 20 by 8 foot bed?: At a supplied depth of 3 inches, a 20 by 8 foot bed takes exactly 40 cubic feet: approximately 1.48 cubic yards and 1.13 cubic metres, or exactly 20 bags if each holds 2 cubic feet. At an illustrative 2 inches it takes about 26.67 cubic feet, 0.99 cubic yards and 14 of those bags; at 4 inches, about 53.33 cubic feet, 1.98 cubic yards and 27 bags. These examples compare quantities and do not select a suitable depth. The exact rectangle calculation is 160 square feet times 3/12 feet of depth, then divide the full volume by the bag capacity and round the bag count up.
How deep should mulch be laid?: Type the depth you have chosen from information relevant to your material and bed. The 2, 3 and 4 inch buttons load examples for comparing quantities; they do not recommend a depth. The field also accepts positive decimals, fractions or scientific notation, with inches or centimetres selected separately. The calculator does not assess plants, trunks, moisture, weeds or playground requirements.
How many 2 cubic foot bags are in a cubic yard of mulch?: A cubic yard is exactly 27 cubic feet. Dividing by a supplied 2 cubic foot bag capacity gives 13.5, rounded up to 14 whole bags. A 3 cubic foot bag gives exactly 9; a 1.5 cubic foot bag gives 18; a 1 cubic foot bag gives 27. These are arithmetic examples, not statements about any particular brand. The equivalent forward worked case is 108 square feet at 3 inches deep, producing exactly one cubic yard. The page takes bed dimensions or known area and depth; it has no direct volume-to-bag or inverse coverage mode.
Does the calculator know what size bags my supplier sells?: Use the capacity printed on your own bag and select cubic feet, litres or cubic metres. The initial 2 cubic foot value is an editable example and does not identify your supplier or product. Current quantities and the three worked cases all recompute using your supplied bag capacity. Whole bag counts use the full exact rectangle or known-area volume before display rounding. A circle bag range means the numerical bound for pi crosses a whole-bag boundary.
Can I measure the bed in metres instead of feet?: Yes. Choose Metres for the length, width, diameter or a genuine known-area field in square metres. Select Centimetres for depth and litres or cubic metres for bag capacity if required. The answer includes cubic yards, cubic feet and cubic metres together. A 6 by 2.4 metre bed at 3 inches takes exactly 1.09728 cubic metres, displayed as 1.10 cubic metres, 38.75 cubic feet and 1.44 cubic yards, with 20 bags of 2 cubic feet. Unit changes preserve the same measurement as an exact decimal or complete fraction; they do not round it to four decimal places. Exactly 2, 3 and 4 inches are 5.08, 7.62 and 10.16 centimetres.
How do I work out a round bed or a tree ring?: Choose Circle and enter the diameter measured across the centre. Area is pi times half the diameter squared. A supplied 12 foot diameter at 3 inches deep takes 9 pi cubic feet, approximately 28.27 cubic feet and 1.05 cubic yards, with 15 bags of 2 cubic feet. Circle decimal results are marked approximate and retain rational bounds. This page does not calculate an annulus or tree ring with an inner gap, and subtracting two separately rounded bag counts does not give its combined whole-bag count.
Is anything uploaded, and does it cost anything?: The arithmetic runs in your browser and the bed measurements are not uploaded. No account is needed for the core calculation. Saved settings restore without being rewritten; valid deliberate edits save in this browser and invalid drafts leave saved settings intact. Unknown and unusable saved records are preserved until you deliberately use Forget saved settings. The page computes supplied quantities and has no price, supplier, delivery or installation total. Site measurement may record allowed aggregate interactions and completions according to your privacy preferences, without the measurements or results.
Can I enter square feet or square metres that I already know?: Choose Known area and enter the measured area in the selected square feet or square metres. Supply the depth and bag capacity separately. Exactly 100 square feet at 3 inches takes 25 cubic feet and 13 bags of 2 cubic feet. Exactly 10 square metres at 10 centimetres takes one cubic metre and 20 bags of 50 litres. A square-yard input unit is not provided.
What do the approximation and abbreviation marks mean?: Decimal volumes round to two places. A tiny positive quantity is shown below the half-step instead of zero. The approximate mark identifies a circle calculation using a 100-place bound for pi; if its bag ceilings differ, the page prints their range. An ellipsis on a large quantity abbreviates it for the stage. Open Complete selectable calculation for all digits, exact fractions, symbolic circle coefficients and rational bounds.

Rectangle and known-area calculations use exact arithmetic without rounding until the last step. Circles use a 100-place bound for pi and have approximate decimal results. Whole bags round up from the full supplied volume; an uncertain circle boundary shows a bag range. Settling and actual bag contents are not inferred.