Formula Used
Rectangle: Area = length × width.
Square: Area = side × side.
Circle: Area = π × radius².
Triangle: Area = 0.5 × base × height.
Base volume: Volume = area × depth.
Adjusted volume: Adjusted volume = base volume × waste factor × settling factor.
Cubic yards: Cubic yards = adjusted cubic feet ÷ 27.
Weight: Weight = adjusted cubic feet × bulk density.
Bags: Bags = adjusted cubic feet ÷ bag size. The answer is rounded up.
How to Use This Calculator
Select the shape that matches your soil area. Enter the related dimensions. Use direct area when you already know the square footage.
Enter the soil depth you want after spreading. Add waste and settling percentages for safer ordering.
Enter bulk density if your supplier provides it. Add bag size, bag price, bulk price, delivery, and tax if you want cost comparisons.
Press the calculate button. The result appears above the form and below the header. Use the export buttons to save your estimate.
Top Soil Dirt Planning Guide
Top soil is the working layer of a garden. It supports roots, stores moisture, and helps nutrients move. A good estimate keeps the project clean. It also prevents short loads and unused piles. This calculator turns bed size and depth into usable order amounts.
Why accurate soil volume matters
Soil is sold in several ways. Landscapers often buy cubic yards. Bagged products use cubic feet. Some suppliers quote tons. These units can confuse a simple garden job. A volume estimate makes them easier to compare. It also helps you review delivery quotes. The calculator adds waste and settling, because fresh soil can compress after watering.
Choosing the right depth
Depth depends on the job. A light lawn dressing may need one quarter inch. New seed areas may need one or two inches. Raised beds often need deeper fills. Vegetable beds can need six inches or more. Enter the final settled depth you want. Then add a settling percentage when the soil is loose. This gives a safer purchase amount.
Density, bags, and bulk orders
Dry topsoil may be lighter than wet soil. Screened blends can also vary. Density changes the weight estimate. The default value is only a guide. Use the supplier density when available. Bag size matters too. A small bag covers less area. A larger bulk bag may reduce handling. The bag count is rounded up, so you do not order part of a bag.
Cost planning tips
Compare bulk, ton, and bag costs before buying. Bulk soil is often cheaper for large beds. Bagged soil is useful for small repairs. Delivery fees may change the best choice. Include a little extra for edging, low spots, and grading. Avoid adding too much around tree trunks. Keep soil below siding and vents. Spread soil evenly, then water it gently. Recheck the level after settling. This simple plan can save money. It can also make planting faster and neater.
Common measuring mistakes
Measure the soil area, not the whole yard. Remove paths, patios, and planted islands. Keep units consistent before entering numbers. For circles, measure across the widest point. For triangles, use the base and height. Recheck depth after raking, because high spots hide shortages.
FAQs
How much top soil do I need?
You need area multiplied by depth. The calculator converts that result into cubic feet, cubic yards, cubic meters, tons, and bags. Add waste and settling percentages for a safer order.
What depth should I use for lawn top dressing?
Many lawn top dressing jobs use a shallow depth. A quarter inch to one half inch is common. Use more only when leveling deeper low spots or preparing new seed areas.
How many cubic feet are in one cubic yard?
One cubic yard equals 27 cubic feet. The calculator divides adjusted cubic feet by 27 to estimate bulk soil orders in cubic yards.
Why does the calculator include settling?
Fresh soil can settle after watering, raking, and foot traffic. A settling allowance helps you order enough material for the final depth you want.
Can I calculate bagged top soil?
Yes. Enter the bag size in cubic feet and the bag price. The calculator rounds the bag count upward, because you cannot usually buy part of a bag.
How is soil weight estimated?
Weight is estimated by multiplying adjusted volume by bulk density. Soil moisture changes weight, so use your supplier’s density when possible.
Should I order extra top soil?
A small extra amount helps cover grading, edges, settling, and measurement errors. Five to ten percent is useful for many garden and lawn projects.
Can this calculator handle round beds?
Yes. Select circle and enter the diameter. The calculator finds the radius, calculates circular area, and then estimates soil volume from your chosen depth.