How many bags of soil for a 4 by 8 raised bed?

A 4 by 8 foot rectangular space at 10 inches holds exactly 80/3 cubic feet and needs 18 bags of 1.5 cubic feet, 27 of 1 or 14 of 2. With a supplied 40 litre capacity it needs 19 bags; with 50 litres it needs 16. Enter those litre capacities directly with L selected. At 12 inches the space holds 32 cubic feet and needs 22 bags of 1.5 cubic feet.

How much soil does a 4 by 4 or a 2 by 8 bed take?

Both have a 16 square foot plan area. At 10 inches they hold 40/3 cubic feet, about 13.33 cubic feet or 378 litres, and need 9 bags of 1.5 cubic feet. The full volume doubles for a 4 by 8 foot space; its rounded bag ceiling is calculated again from the combined volume. Supply the fill depth and bag capacity for your own space.

How deep should I fill a raised bed?

This page presents a 10 inch fill depth as an editable example. It does not select a suitable depth for a crop, growing medium or base. A 4 by 8 foot rectangle holds 16 cubic feet at 6 inches, 80/3 at 10 inches and 48 at 18 inches. Enter the depth you have chosen from your own requirements.

Should I add extra soil for settling?

There is no automatic settling allowance. The result is the geometric volume at the depth you supply, and the calculator does not estimate how a medium will change. Increasing a 4 by 8 foot example from 10 to 11 inches raises volume from 80/3 to 88/3 cubic feet and the 1.5 cubic foot bag ceiling from 18 to 20. That is a comparison of supplied depths, not advice to add an inch.

Is it cheaper to buy bags or a bulk load?

This page gives geometric volume and a whole-bag ceiling for your supplied capacity. It carries no bag prices, delivered bulk quotes or cost comparison, so it cannot decide which is cheaper. A 4 by 8 foot space at 10 inches is 80/81 cubic yards. Compare relevant local prices and delivery terms separately.

Raised Bed Soil Calculator

A 4 foot by 8 foot raised bed filled 10 inches deep takes 26.67 cubic feet of soil, which is 0.99 cubic yards, 755 litres, or 18 bags of the 1.5 cubic foot size once the part bag is rounded up. This page presents Raised bed mode and a 10 inch depth converted into the selected depth unit. Enter your own rectangular length and width, or known area, plus chosen fill depth and bag capacity. See cubic feet, cubic yards, litres, cubic metres and bags, with exact unit conversions and complete working. The starting depth is an arithmetic example; the page does not choose a horticulturally suitable depth, settling allowance or supplier.

Soil needed4 ft by 8 ft at 10 in

Cubic feet26.67

0.99 cu yd · 755.12 litres · 0.76 m³18 bags at 1.5 ft³, rounded up

2.97 m² combined plan area × 10 in = 0.76 m³; bag division uses the full combined volume.

Supply your measured space, chosen fill depth and the capacity printed on your bag. Pot mode measures identical straight-sided cylinders using an inside diameter and fill height; it does not model taper or a plant. The initial dimensions and 1.5 ft³ bag are editable examples. Plan, depth and bag units are independent. Unit changes preserve measurements as exact decimals or fractions. Results round to two decimal places; ≈ marks a cylinder approximation and … marks an abbreviation. Complete values are below.

Complete selectable calculation

Soil Calculator - supplied quantity estimate
Mode: bed; 4 ft by 8 ft at 10 in
Supplied bag capacity: 1.5 ft³
Combined plan area: exact 2.97289728 m² (1161288/390625)
cubicMetres: exact 0.75511590912 m³ (36870894/48828125)
cubicFeet: exact 80/3 ft³ (80/3)
cubicYards: exact 80/81 yd³ (80/81)
Litres: exact 755.11590912 L (294967152/390625)
Whole bags: 18
A supplied rectangular space or known area and chosen fill depth, or identical straight-sided cylindrical containers with an inside diameter, fill height and exact positive whole count. Defaults are editable examples, not suitable depths or product recommendations.
Rectangle and known-area arithmetic and unit conversions are exact. Cylinders are π times the stated coefficient; decimal displays use a 100-place bound for π and are approximate. A bag range means that bound straddles a whole-bag boundary.
Bag counts round up from the full combined volume before display rounding. Large previews are abbreviated; this report retains complete values. Litres are exactly 1000 times cubic metres.
No taper, root-ball displacement, drainage, settling, compaction, weight, soil mix, material suitability, supplier, delivery or price is inferred. Separately rounded bag counts do not establish the ceiling for a combined job.

A 4 by 8 raised bed10 in of mix
26.67 cu ft · 18 bags at 1.5 ft³
A hole to fill3 ft by 3 ft, 2 ft deep
18.00 cu ft · 12 bags at 1.5 ft³
A 12 in round pot10 in of mix
≈ 0.65 cu ft · 1 bags at 1.5 ft³

Supplied quantities and complete working. Exact arithmetic for length by width by depth or known area by depth, with quantities converted without rounding until the last step. The cylinder formula for a pot uses a bounded approximation of pi; a bag-count range marks an uncertain boundary. It cannot know how far soil settles after its first watering, how much room root balls take, or what a brand actually puts in a bag. Open the complete calculation for exact quantities, cylinder bounds and the assumptions used.

Common questions

How many bags of soil for a 4 by 8 raised bed?: A 4 by 8 foot rectangular space at 10 inches holds exactly 80/3 cubic feet and needs 18 bags of 1.5 cubic feet, 27 of 1 or 14 of 2. With a supplied 40 litre capacity it needs 19 bags; with 50 litres it needs 16. Enter those litre capacities directly with L selected. At 12 inches the space holds 32 cubic feet and needs 22 bags of 1.5 cubic feet.
How much soil does a 4 by 4 or a 2 by 8 bed take?: Both have a 16 square foot plan area. At 10 inches they hold 40/3 cubic feet, about 13.33 cubic feet or 378 litres, and need 9 bags of 1.5 cubic feet. The full volume doubles for a 4 by 8 foot space; its rounded bag ceiling is calculated again from the combined volume. Supply the fill depth and bag capacity for your own space.
How deep should I fill a raised bed?: This page presents a 10 inch fill depth as an editable example. It does not select a suitable depth for a crop, growing medium or base. A 4 by 8 foot rectangle holds 16 cubic feet at 6 inches, 80/3 at 10 inches and 48 at 18 inches. Enter the depth you have chosen from your own requirements.
Should I add extra soil for settling?: There is no automatic settling allowance. The result is the geometric volume at the depth you supply, and the calculator does not estimate how a medium will change. Increasing a 4 by 8 foot example from 10 to 11 inches raises volume from 80/3 to 88/3 cubic feet and the 1.5 cubic foot bag ceiling from 18 to 20. That is a comparison of supplied depths, not advice to add an inch.
Is it cheaper to buy bags or a bulk load?: This page gives geometric volume and a whole-bag ceiling for your supplied capacity. It carries no bag prices, delivered bulk quotes or cost comparison, so it cannot decide which is cheaper. A 4 by 8 foot space at 10 inches is 80/81 cubic yards. Compare relevant local prices and delivery terms separately.

Exact arithmetic for length by width by depth or known area by depth, with quantities converted without rounding until the last step. The cylinder formula for a pot uses a bounded approximation of pi; a bag-count range marks an uncertain boundary. It cannot know how far soil settles after its first watering, how much room root balls take, or what a brand actually puts in a bag.