Everyday MathFree

Mulch and Soil Calculator

Find how many cubic feet or cubic yards of mulch, soil, or compost you need for a rectangular bed. Choose a common bag size in cubic feet to estimate bag count.

Enter Values

Length

Width

Depth

Bag size

Result

Enter values above and click Calculate to see your result.

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Formula

Core Formula

V = L \times W \times \frac{D_{\text{in}}}{12}

How it works: Multiply the bed area in square feet by depth in feet. Bags divide total cubic feet by the size printed on the bag (2 or 3 cubic feet are typical for mulch).

Worked Example

Bed 20 ft by 3 ft, mulch 3 inches deep, 2 cu ft bags:

1Step 1: Volume = 20 x 3 x (3/12) = 15 cu ft

2Step 2: Cubic yards = 15 / 27 = 0.56 cu yd

3Step 3: Bags = ceil(15 / 2) = 8 bags

Frequently Asked Questions

How deep should mulch be?

Two to three inches is typical for weed control and moisture. Thicker layers can suffocate plant roots in some beds.

Are bulk loads cheaper than bags?

Often yes for large areas. Use the cubic yard number to compare quotes from a nursery or landscape supply yard.

Does compost use the same math?

Yes. Volume is the same. Only the product and bag size on the label change.

How can I put this Mulch and Soil Calculator on my blog or website?

Yes, the Mulch and Soil Calculator is fully embeddable. Tap "Embed" above to configure appearance and copy the code. It is free to use, works on any platform (HTML, WordPress, CMS), and adjusts to any screen size automatically. Visit calculory.com/services/embed-calculators for the complete guide.

AI Assistant

Ask about this calculator

I can help you understand the mulch and soil calculator formula, interpret your results, and answer follow-up questions.

Try asking

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