Interactive raised bed calculator
Enter bed size. Get soil volume, bags, cost, and a shopping list.
Default example: one 4×8×12 in bed, 10% settling, and 2 ft³ bags. Results update automatically as inputs change.
More planners: mix, containers, spacing, top-off, depth, cost, multi-bed, shapes
Raised Bed Soil & Planting Calculator
Bulk Soil vs Bags Calculator
Compare bagged soil cost with bulk cubic-yard soil delivery including fee and minimum order.
Preset: bagged soil versus bulk delivery
Formula: bulk total = max(required yd³, minimum order yd³) × price per yd³ + delivery fee
Worked example: If the minimum order is larger than your need, the calculator shows extra overbuy volume before recommending bulk.
Adjust the live inputs above before copying the shopping list, printing the result, or buying material.
How to use this calculator
- Confirm the preset and unit labels.
- Replace every default that differs from your bed, container, bag, price, or planting plan.
- Review volume, bag count, cost, warnings, and rounding.
- Check package labels and local conditions before purchasing or planting.
What to verify
- Ignoring delivery minimums and delivery fees.
- Comparing prices without accounting for overbuy.
- Ordering the exact calculated amount with no allowance for settling.
Page-specific notes
- Bulk can be cheaper for larger fills.
- Small fills often remain easier with bags.
Planning assumptions and sources
Bag pages require a package volume label; weight-only labels cannot be converted to volume without product density.
BedSoil keeps deterministic volume math separate from gardening assumptions. Cubic-foot, cubic-yard, liter, quart, gallon, and bag-count calculations come from your inputs; crop spacing, crop depth, mix ratio, and container advice are planning aids that need product labels, seed packets, local Extension guidance, and soil-test context.
- Oregon State Extension: How to use compost in gardens and landscapes A: Compost bag sizes, bulk cubic yards, 27 ft³ per yd³, and annual compost planning ranges.
- University of Minnesota Extension: Soil compaction A: Bulk density depends on pore space, texture, and compaction; weight-only bag labels cannot be converted exactly to volume.
- NIST: Approximate Conversions from U.S. Customary Measures to Metric A: Source provenance for U.S. customary and metric unit conversion factors.
- Oregon State Extension: Cubic yard compost reference A: Direct support for 1 yd³ = 27 ft³ bulk-compost and bulk-soil planning.
- USDA National Agricultural Library: Raised Beds & Container Gardening A: Trust hub for raised beds, containers, growing media, water, light, and related resources.
- University of Minnesota Extension: Raised bed gardens A: Raised bed placement, water access, sunlight, access, fill, and soil-mix considerations.
- University of Maryland Extension: Soil to Fill Raised Beds A: Raised bed fill scenarios, hard-surface depth guidance, topsoil limits, soil testing, and lead caution.
- University of Maryland Extension: Soil Testing and Soil Testing Labs A: Soil tests provide pH, nutrient, organic-matter, and recommendation context; vegetable gardens should consider lead testing.
- University of Maryland Extension: Understanding Your Soil Test Report A: Soil reports show pH, phosphorus, potassium, magnesium, calcium, organic matter, and lab recommendations; calculators should not replace lab interpretation.
Source library coverage
The project source library now contains 39 curated references. This page shows the sources most relevant to the active calculator mode; 30 additional references cover SERP patterns, containers, compost, soil testing, amendments, and related crop assumptions.
Always check product labels, seed packets, local extension guidance, soil tests, delivery minimums, drainage, and site conditions before purchasing materials or planting.
FAQ
How much soil do I need for a 4x8 raised bed?
A 4×8 bed filled 12 inches deep needs 32 cubic feet, or about 1.19 cubic yards, before any settling allowance.
How many bags of soil do I need for a raised bed?
Divide the required cubic feet by the bag volume in cubic feet, then round up. The calculator does this automatically.
Should I add extra soil for settling?
Many gardeners add 10–15% for initial settling, especially when compost-heavy material is used.
What is the difference between cubic feet and cubic yards?
One cubic yard is 27 cubic feet. Bulk soil is usually sold by the cubic yard; bags are often labeled in cubic feet, dry quarts, or liters.
Is 40 lb of soil the same as 40 quarts?
No. Pounds measure weight, while quarts measure volume. Soil weight changes with moisture and material density.
How deep should a raised bed be?
Six to eight inches can work for shallow greens and herbs. Tomatoes, peppers, squash, and longer root crops usually benefit from 12 inches or more.
Disclaimer
BedSoil results are planning estimates for buying and mixing soil. They are not agricultural, engineering, pest, disease, fertilizer, or crop-yield advice. Check product labels, local material quality, drainage, bed construction, climate, and crop variety before purchasing materials.