How much does a cubic yard of compost weigh?

A cubic yard of finished compost weighs approximately 1,000 pounds (0.5 tons). This varies significantly with moisture content, from about 700 lbs when dry to 1,400 lbs when very wet.

How deep should compost be for a vegetable garden?

For existing vegetable gardens, apply 2-3 inches of compost annually and work it into the top 6-8 inches of soil. For new garden beds, start with 4-6 inches of compost mixed thoroughly with your native soil.

How many bags of compost equal a cubic yard?

One cubic yard equals 27 cubic feet, so you need 27 one-cubic-foot bags to match a cubic yard of bulk compost. This is why bulk delivery is usually much cheaper for anything over a few cubic feet.

Can you put too much compost on a garden?

Yes. Excessive compost (more than 30-40% of your soil mix) can cause nutrient imbalances, especially excess phosphorus, and may make soil too fluffy to support plants well. For established beds, 2-3 inches of annual topdressing is the sweet spot.

Compost Calculator

Applying the right amount of compost makes all the difference for soil health. Too little and your plants do not get the benefit; too much and you waste money or risk nutrient overload. Enter your area dimensions and desired depth to find out exactly how much compost to order in cubic yards, bags, or tons.

How Compost Volume Is Calculated

The formula is simple: Length x Width x Depth = Volume. The calculator converts your depth from inches to feet, computes cubic feet, then divides by 27 to get cubic yards.

Recommended Compost Depths

Application	Depth	Notes
Existing garden beds	2-3 inches	Annual top-dressing
New garden beds	4-6 inches	Mix into top 6-8 inches of soil
Lawn topdressing	0.25-0.5 inches	Spread thin, rake into grass
Lawn renovation	1-2 inches	Before overseeding
Raised bed fill	3-4 inches	Mix with soil (30-40% compost)

Compost Weight

Finished compost weighs approximately 1,000 lbs per cubic yard, but moisture content makes a big difference. Dry compost can be as light as 700 lbs/yd3, while wet, fresh compost might hit 1,400 lbs/yd3. Plan for the heavier side if you are picking up during a rainy week.

Bulk vs. Bagged

Bagged compost (1 ft3): Convenient for small jobs, but expensive at $4-8 per bag
Bulk compost: Sold by the cubic yard at $25-50, dramatically cheaper for larger projects
Break-even point: Around 1-2 cubic yards, bulk delivery becomes more cost-effective

A single cubic yard equals 27 one-cubic-foot bags. At $5 per bag that is $135, versus $30-50 for bulk delivery of the same amount.

Tips for Using Compost

Mix compost into soil rather than just layering on top for best results
For lawns, use finely screened compost that can settle between grass blades
Apply in spring or fall when plants are actively growing
Compost is not fertilizer -- it improves soil structure and feeds microorganisms