Home, Trade & Construction

Topsoil Calculator

Estimate topsoil volume from length, width and depth, with cubic-yard, cubic-foot, cubic-metre, litre, bag and bulk-order checks plus a printable garden or landscaping job note.

Use calculator See formula Questions

Default example2.716 yd³ order volume20 ft × 10 ft = 200 ft² · depth 4 in ÷ 12 = 0.33333 ft · base volume 66.667 ft³ = 2.4691 yd³ (1.8878 m³) · with 10% allowance = 2.716 yd³ / 2.0766 m³ / 2,077 L · about 84 × 25 L bags · bulk estimate $122.22 at $45.00/yd³

Calculator

Working calculator

Area length (ft)Measure the longest side of the bed, lawn patch or raised area in feet.Area width (ft)Measure the average width in feet. For irregular beds, use a sensible average and write a note on the printout.Topsoil depth (in)Enter the planned spread depth. Common top-dressing jobs may be shallow; new beds often need more.Settlement / ordering allowance (%)Optional allowance for settling, uneven ground, spillage and ordering margin.Bag size (L)Use the size printed on the bag if buying bagged topsoil.Bulk price ($/yd³)Optional supplier price for a rough bulk-order cost note.

Live result2.716 yd³ order volume20 ft × 10 ft = 200 ft² · depth 4 in ÷ 12 = 0.33333 ft · base volume 66.667 ft³ = 2.4691 yd³ (1.8878 m³) · with 10% allowance = 2.716 yd³ / 2.0766 m³ / 2,077 L · about 84 × 25 L bags · bulk estimate $122.22 at $45.00/yd³

Formula used

Area square feet = length feet × width feet. Depth feet = depth inches ÷ 12. Base volume cubic feet = area × depth feet. Cubic yards = cubic feet ÷ 27. Order volume = base volume × (1 + allowance percent ÷ 100). Cubic metres = cubic yards × 0.764554857984. Litres = cubic metres × 1000. Bags = ceiling(litres ÷ bag size litres).

This is the method behind the answer, so the result can be checked rather than simply trusted.

Visual grid

This result measures part of the space you live in

Length, area, volume and material estimates are grid problems too: measure the space, account for edges and allowances, then turn the pattern into a number you can use.

Micro-timehours, minutes, shiftsHuman scaledays, weeks, projectsMacro-timemonths, years, calendars

Measured output2.716 yd³ order volume

Space calculations turn a real surface, room, run or volume into cells, edges and allowances that can be quoted, ordered or checked.

2.716 yd³ order volume20 ft × 10 ft = 200 ft² · depth 4 in ÷ 12 = 0.33333 ft · base volume 66.667 ft³ = 2.4691 yd³ (1.8878 m³) · with 10% allowance = 2.716 yd³ / 2.0766 m³ / 2,077 L · about 84 × 25 L bags · bulk estimate $122.22 at $45.00/yd³

Inputs

Area length: 20 ft
Area width: 10 ft
Topsoil depth: 4 in
Settlement / ordering allowance: 10 %
Bag size: 25 L
Bulk price: 45 $/yd³

Method

For a 20 ft by 10 ft bed at 4 inches deep, area = 200 ft² and depth = 4 ÷ 12 = 0.3333 ft. Base volume = 66.67 ft³, which is 66.67 ÷ 27 = 2.47 yd³. With a 10% allowance, the order volume is about 2.72 yd³.

Assumptions

The calculator treats the entered area as a rectangle or an averaged rectangular equivalent for planning purposes.
Depth is entered in inches and converted to feet before volume is calculated.
The allowance is shown separately so settling, uneven ground and ordering margin do not hide the measured soil requirement.
Bag count is rounded up to whole bags using the entered litre size; real bag fill, moisture and compaction can vary.

Notes

Use this space on the printed report for client, supplier, classroom, job-location, measurement, quote or approval notes.

Formula

Worked example

For a 20 ft by 10 ft bed at 4 inches deep, area = 200 ft² and depth = 4 ÷ 12 = 0.3333 ft. Base volume = 66.67 ft³, which is 66.67 ÷ 27 = 2.47 yd³. With a 10% allowance, the order volume is about 2.72 yd³.

Professional note

Master’s Tip: keep depth honest. A one-inch change over a large lawn or garden bed can add several cubic yards, so print the planned depth, allowance and supplier unit before ordering.

Regional and unit assumptions

Standard or basis: ordinary rectangular volume arithmetic with 27 cubic feet per cubic yard and 1 cubic yard ≈ 0.764554857984 cubic metres. Confirm soil type, delivery minimums, compaction, local contamination rules and horticultural needs with the supplier or a qualified professional where they matter.

Assumptions and limitations

The calculator treats the entered area as a rectangle or an averaged rectangular equivalent for planning purposes.
Depth is entered in inches and converted to feet before volume is calculated.
The allowance is shown separately so settling, uneven ground and ordering margin do not hide the measured soil requirement.
Bag count is rounded up to whole bags using the entered litre size; real bag fill, moisture and compaction can vary.
This is a homeowner and landscaping estimate, not a geotechnical, drainage, structural or certified material specification.

Methodology & Accuracy

How this calculator is checked

CalculationTime pages are built around visible arithmetic: the formula, assumptions, worked example and practical limitations are shown so the result can be checked rather than simply trusted.

Formula used

Standard or basis

Where a calculator follows a named legal, trade or industry standard, that standard is cited visibly. Otherwise the page uses transparent general arithmetic and states its limits.

Master's Tip

Master’s Tip: keep depth honest. A one-inch change over a large lawn or garden bed can add several cubic yards, so print the planned depth, allowance and supplier unit before ordering.

Related calculators

Questions

How do I calculate how much topsoil I need?

Multiply length by width to get square feet, convert the depth from inches to feet, multiply area by depth for cubic feet, then divide by 27 for cubic yards.

How many cubic feet are in a cubic yard of topsoil?

There are 27 cubic feet in 1 cubic yard because 1 yard is 3 feet and 3 × 3 × 3 = 27.

Should I add extra topsoil for settling?

Often yes. A separate allowance helps cover settling, uneven ground, spillage and ordering margin. The exact extra depends on the site and supplier.

Can I use this for an irregular garden bed?

Yes for a planning estimate if you enter an average length and width or split the bed into smaller rectangles. Write the method in the printed notes.

What should I print for a topsoil order record?

Print the area, planned depth, base cubic yards, allowance, order volume, bag count or bulk price, formula, assumptions, page URL, date and job notes.

Calculation note

Topsoil ordering is a volume problem, but real sites are rarely perfect boxes. A useful record keeps the simple rectangular math visible while naming the practical allowance for settlement, uneven ground and supplier rounding.

Depth drives the order

Length and width are easy to see on site, but depth quietly controls the final volume. Doubling the spread depth doubles the soil requirement.

Bulk yards and bags answer different shopping questions

Landscapers often talk in cubic yards, while garden centres sell many bagged soils by litres. Showing both keeps the same calculation useful for delivery quotes and weekend shop runs.

A printed job note prevents re-measuring

A topsoil printout with dimensions, depth, allowance, price and notes helps a homeowner, gardener or contractor check what was ordered and why.

Sources and further readingNIST Handbook 44 Appendix C — General Tables of Units of Measurement BIPM — The International System of Units University of Georgia Extension — soil preparation and landscape planting guidance