Compost Calculator for Raised Beds
Compost feeds raised-bed soil. Enter your bed size and the layer depth for cubic yards and bags.
Shape
Units
Area: 0.0 sq ft
Planning more than one thing? Open the Yard Planner → to trace your whole yard over an aerial photo and total every material at once.
How to measure for compost
- Measure the length and width of your area in feet.
- Multiply them for square feet (or just enter length and width above).
- Choose a depth — we default to 2 inches for compost.
- Read your total in cubic yards, or the number of bags.
Compost for Raised Beds coverage at a glance (2" deep)
| Area (sq ft) | Cubic yards | Bags |
|---|---|---|
| 100 | 0.7 | 19 |
| 200 | 1.4 | 37 |
| 300 | 2.0 | 56 |
| 500 | 3.4 | 92 |
| 1,000 | 6.8 | 184 |
Includes a 10% overage allowance. Estimates are low-fi — confirm with your supplier.
Frequently asked questions
How much compost should I add to a raised bed each year?
Top up with 1–2 inches annually, worked into the surface. Enter your bed size with that depth above.
Can I fill a raised bed with only compost?
It's best mixed with topsoil — pure compost can stay too wet and settle a lot. Aim for roughly a third compost by volume.