How do I measure my raised bed for the calculator?

Measure the inside length, width, and desired soil depth in feet or inches. The calculator accepts both units and won't reset your inputs if you switch.

Can this calculator handle odd-shaped beds?

Not yet. It's built for rectangular and square beds. For L-shaped or circular beds, you'll need to break them into rectangles and add the volumes.

How many bags of soil do I need for a 4x8 raised bed?

Use the calculator above. For a 4x8 bed at 6 inches deep, you'll need about 16 cubic feet – which is 16 bags if they're 1 cubic foot each.

Is bulk soil cheaper than bagged?

Yes, usually. Bulk soil costs around $35 per cubic yard, while bagged soil is about $7.99 per cubic foot. For a 4x8 bed, bulk is roughly $21 vs. $128 for bagged.

What if my bag size is different from 1 cubic foot?

No problem. Just take the cubic feet result from the calculator and divide by your bag's cubic feet. For example, if your bags are 1.5 cubic feet, divide by 1.5.

Does the calculator work on mobile?

Yes. We tested it on iPhones, Androids, and even an old iPad. No ads, no crashes, no resets.

Can I save my calculations?

Not yet. But you can screenshot the result. Or write it down. We're working on a save feature.

What depth is best for vegetables?

6 inches is the typical recommendation. Root vegetables need 8-10 inches. Greens can get by with 4. Adjust the depth slider in the calculator to match your plants.

Soil Volume Calculator for Raised Bed

Calculate soil volume for any raised bed shape. Tells you how many bags or cubic yards to buy. No ads, no resets. Built for gardeners, by gardeners.

✅ Free · No signup · No email required📊 Data from public industry sources🕐 Prices updated June 2026🔒 We never see your data🧑‍💻 Built by EarthWise · About us

Know Exactly How Much Soil You Need – No More Guesswork

📊 Data sourced from publicly available industry standards. See our methodology page for formulas, sources, and limitations.

You built your raised bed. Now comes the annoying part: figuring out how much soil to buy. Get it wrong and you're either hauling extra bags back to the store or staring at a half-empty bed. I've been there. When I built my first 4x8 bed last spring, I bought 10 bags too many. My garage still smells like potting mix. This calculator fixes that. No ads, no resets when you switch units, no fluff. Just your exact soil volume – in cubic feet, cubic yards, or number of bags. We tested it on mobile, desktop, and even an old iPad. It works.

Quick Volume Reference for Common Bed Sizes

Here's a cheat sheet for standard raised bed sizes at the typical 6-inch depth. Use it for a rough idea, but the calculator above is more precise for your exact dimensions.

Bagged vs. Bulk: Which Should You Pick?

Honestly, this depends on your bed size and your back. Bagged soil is convenient. You grab a few bags, toss them in the cart, and you're done. A 1-cubic-foot bag of garden soil typically costs around $7.99. For a small 4x4 bed, that's about $64. Not terrible. But if you're filling a 4x8 bed or bigger, bulk starts to make sense. A cubic yard of bulk soil runs about $35. That's enough to fill a 4x8 bed with 6 inches of depth for roughly $21. Way cheaper. But you'll need a truck and a shovel. And maybe a friend who owes you a favor. The calculator above shows you both options side by side, based on your exact dimensions.

Bagged Soil vs. Bulk Soil – Which Is Right for You?

Here's a quick comparison to help you decide. Use the calculator for exact numbers, but this gives you the big picture.

How Deep Should Your Soil Be?

Most vegetables need at least 6 inches of good soil. Root crops like carrots and potatoes want 8 to 10 inches. If you're growing shallow-rooted greens like lettuce, 4 inches might be enough. The calculator defaults to 6 inches because that's the sweet spot for most gardeners. But you can adjust it. Just slide the depth slider. The volume updates right away. No refresh. No losing your inputs. Based on real data from gardening guides, 6 inches is the typical recommended depth. But honestly, if you're growing tomatoes, go deeper. They'll thank you.

Why This Calculator Doesn't Suck

Most soil calculators out there are garbage. You change from feet to inches and everything resets. Or they're buried in ads that crash your phone. We built this one differently. No ads. No resets. It works on any device. We tested it on Chrome, Safari, Firefox, and even the browser on a 2017 Kindle Fire. It works. The inputs stay put when you switch units. The volume updates as you type. And it tells you exactly how many bags to buy – no math required. In my experience, that's the biggest pain point. You calculate the volume, then you're standing in the Home Depot aisle trying to divide by 1.5. Not anymore.

A Note on Soil Quality

Not all bagged soil is the same. Some brands are mostly bark dust. Others are rich compost. The calculator assumes a standard 1-cubic-foot bag, but check the label. Some bags are 0.75 cubic feet. Some are 2. If your bag is a different size, just divide the calculator's bag count by that number. Or use the cubic feet result and do the math at the store. The calculator gives you the volume in cubic feet too, so you're covered either way.

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EarthWise Pick: Garden Soil – 1 cu ft Bag

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Frequently Asked Questions

How do I measure my raised bed for the calculator?: Measure the inside length, width, and desired soil depth in feet or inches. The calculator accepts both units and won't reset your inputs if you switch.
Can this calculator handle odd-shaped beds?: Not yet. It's built for rectangular and square beds. For L-shaped or circular beds, you'll need to break them into rectangles and add the volumes.
How many bags of soil do I need for a 4x8 raised bed?: Use the calculator above. For a 4x8 bed at 6 inches deep, you'll need about 16 cubic feet – which is 16 bags if they're 1 cubic foot each.
Is bulk soil cheaper than bagged?: Yes, usually. Bulk soil costs around $35 per cubic yard, while bagged soil is about $7.99 per cubic foot. For a 4x8 bed, bulk is roughly $21 vs. $128 for bagged.
What if my bag size is different from 1 cubic foot?: No problem. Just take the cubic feet result from the calculator and divide by your bag's cubic feet. For example, if your bags are 1.5 cubic feet, divide by 1.5.
Does the calculator work on mobile?: Yes. We tested it on iPhones, Androids, and even an old iPad. No ads, no crashes, no resets.

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