Liters Of Soil To (Pound/Kg) Calculator

You bought a bag of soil. It says 50 liters on the front. Now you need to know how much it actually weighs — either to check your vehicle’s load limit, figure out a delivery, or just plan around what you can physically carry.

That’s what this calculator is for.

Put in your volume in liters. Pick your soil type. Get the weight back in pounds or kilograms. Done.

Why You Can’t Just Guess Soil Weight from Volume

This is the part that trips most people up.

Liters measure space. Kilograms and pounds measure mass. The two don’t convert at a fixed rate — not for soil, anyway. A liter of water always weighs 1 kg. Soil doesn’t work that way.

Topsoil Calculator

The weight of a liter of soil depends on what’s in it. Dry topsoil is lighter. Wet topsoil is heavier. Sandy soil sits at a different density than clay. Potting mix — which is mostly organic matter and perlite — weighs noticeably less than garden topsoil for the same volume.

So when someone asks how many pounds is 50 liters of soil, the honest answer is: it depends on the type and moisture level. Dry topsoil at 50 liters comes out around 55–65 lbs. Wet or compacted soil at the same volume can push past 80 lbs.

That’s a big range. The calculator accounts for it.

How Much Does a Litre of Soil Weigh?

As a general rule:

• Dry topsoil: roughly 1.1 to 1.3 kg per liter (about 2.4 to 2.9 lbs per liter)
• Moist topsoil: roughly 1.3 to 1.5 kg per liter (about 2.9 to 3.3 lbs per liter)
• Potting mix / compost: roughly 0.4 to 0.7 kg per liter (much lighter — lots of air and organic matter)
• Clay-heavy soil: can reach 1.6 kg per liter or more when wet
• Compost: roughly 0.5 to 0.7 kg per liter (about 1.1 to 1.5 lbs per liter) — similar weight to potting mix
• Sand (dry): roughly 1.4 to 1.6 kg per liter (about 3.1 to 3.5 lbs per liter) — heavier than topsoil

These are working estimates, not lab numbers. Real soil varies. But for planning a delivery, checking a load, or just figuring out if you can lift that bag — these ranges get you close enough.

Common Bag Sizes Converted

Most people searching for this just want a quick answer for a specific bag size. Here are the most commonly looked-up conversions using average moist topsoil density:

Bag Volume	Approx. Weight (lbs)	Approx. Weight (kg)
20 liters	28–32 lbs	13–15 kg
21 liters	30–35 lbs	14–16 kg
25 liters	35–40 lbs	16–18 kg
28 liters	39–45 lbs	18–20 kg
28.3 liters	39–46 lbs	18–21 kg
30 liters	42–48 lbs	19–22 kg
40 liters	55–65 lbs	25–29 kg
42 liters	58–68 lbs	26–31 kg
42.5 liters	59–69 lbs	27–31 kg
50 liters	70–85 lbs	32–38 kg
56 liters	78–94 lbs	35–43 kg
56.6 liters	79–95 lbs	36–43 kg
60 liters	84–100 lbs	38–45 kg
80 liters	110–132 lbs	50–60 kg
84.9 liters	118–141 lbs	53–64 kg
85 liters	119–142 lbs	54–64 kg
100 liters	140–165 lbs	63–75 kg
750 liters	1,050–1,230 lbs	475–560 kg

These figures assume standard moist garden topsoil. For potting mix, expect roughly 40–60% of these weights. For wet clay soil, expect the higher end or beyond.

Liters to kg — Soil Conversion Explained

Converting soil liters to kg is straightforward once you fix a density figure. Whether you call it liter to kg soil, litre to kg soil, or just l to kg soil — it’s all the same formula.

Weight (kg) = Volume (liters) × Density (kg/L)

For typical moist topsoil, density sits around 1.3–1.5 kg per liter. So:

• 50L soil in kg → 50 × 1.3 = 65 kg (dry end) up to 50 × 1.5 = 75 kg (moist)
• 100L of soil in kg → roughly 130–150 kg
• 60L of soil in kg → roughly 78–90 kg
• 40L soil in kg → roughly 52–60 kg
• 25L soil to kg → roughly 33–38 kg
• 20L soil in kg → roughly 26–30 kg
• 30 liters to kg → roughly 39–45 kg
• 600 litres of soil in kg → roughly 780–900 kg

For potting mix, use a density of around 0.5–0.6 kg/L instead. A 32-quart bag of potting soil (roughly 30 liters) typically weighs only around 15–20 lbs — much lighter than the same volume of garden topsoil. If you’re wondering how much a 32-quart bag of potting soil weighs, that’s your number: usually 15–20 lbs depending on the brand and moisture.

The calculator above handles all of this automatically. Pick your soil type and it adjusts the density for you.

Liters to Pounds — Quick Reference

For US buyers working in pounds, here are the key conversions using moist topsoil:

• 21 liters of soil to pounds → roughly 60–70 lbs (same answer whether it’s soil or dirt)
• 25 liters of soil to pounds → roughly 72–82 lbs
• 28 liters of soil to pounds → roughly 80–92 lbs
• 3 liters of soil to pounds → roughly 81–93 lbs
• 42 liters of soil to pounds → roughly 120–138 lbs
• 5 liters of soil to pounds → roughly 122–140 lbs
• 47 liters of soil to pounds → roughly 122–140 lbs (same range as 42.5 liters)
• 50 liters of soil to pounds → roughly 143–165 lbs
• 56 liters of soil to pounds → roughly 160–185 lbs
• 6 liters of soil to pounds → roughly 162–187 lbs
• 85 liters of soil to pounds → roughly 243–280 lbs
• 9 liters of soil to pounds → roughly 243–280 lbs

These are real-world working numbers. Not lab values. Use them for planning, not engineering.

Quarts to Pounds — Quick Reference

A lot of bagged soil in the US is labeled in quarts rather than liters. Using the same moist topsoil density as above (2.9–3.3 lbs per liter):

• 8 quarts of soil to pounds → roughly 22–25 lbs
• 10 quarts of soil to pounds → roughly 27–31 lbs
• 14 quarts of soil to pounds → roughly 38–44 lbs
• how many pounds is 16 quarts of soil → roughly 44–50 lbs
• 20 quarts of soil to pounds → roughly 55–63 lbs
• 25 quarts of soil to pounds → roughly 69–78 lbs
• 32 quarts of soil to pounds → roughly 88–100 lbs
• 50 quarts of soil to pounds → roughly 137–156 lbs
• 55 quarts of soil to pounds → roughly 151–172 lbs

Potting soil weighs a lot less per quart, since it’s a much lighter mix:

• how much does 8 quarts of potting soil weigh → roughly 4–5 lbs
• how much does 16 quarts of potting soil weigh → roughly 8–10 lbs
• how many pounds is 25 quarts of potting soil → roughly 12–16 lbs
• 32 quarts of potting soil weigh → roughly 15–20 lbs
• how much does 50 quarts of potting soil weigh → roughly 24–32 lbs
• how many pounds is 55 quarts of potting soil → roughly 26–35 lbs

Compost Weight by Volume

Compost lands close to potting mix in density — light and airy compared with garden topsoil. Using roughly 0.5–0.7 kg per liter (1.1–1.5 lbs per liter):

• how much does 20 litres of compost weigh → roughly 22–30 lbs (9–14 kg)
• how much does 40 litres of compost weigh → roughly 44–60 lbs (18–28 kg)
• how much does 50l of compost weigh → roughly 55–75 lbs (23–35 kg)
• how much does 56 l of compost weigh → roughly 62–84 lbs (25–39 kg)
• how much does 60l of compost weigh → roughly 66–90 lbs (27–42 kg)
• how much does 100l of compost weigh → roughly 110–150 lbs (45–70 kg)

What Affects Soil Weight the Most?

Three things move the number more than anything else.

Moisture. Wet soil is dramatically heavier than dry. A 50-liter bag of topsoil fresh from outdoor storage after rain can weigh 20–30% more than the same bag kept indoors and dry. This is the biggest variable of all.

Soil type. Sandy soil drains fast and tends to be lighter. Clay holds water and gets very heavy very quickly. Standard topsoil sits somewhere in between.

Organic content. Potting mix, compost, and peat-heavy blends are much lighter per liter than mineral soil. That’s why a 50-liter bag of potting mix feels nothing like a 50-liter bag of topsoil from a garden center.

If you’re lifting bags manually, always assume the heavier end of the range. Backs don’t care about averages.

FAQs

How many pounds is 56.6 liters of soil?

A 56.6-liter bag of topsoil (the equivalent of a 2.0 cu. ft. bag) weighs approximately 162–187 lbs depending on moisture. Dry topsoil comes in at the lower end; wet or dense soil pushes toward the higher end.

How many pounds is 28 liters of soil?

A 28-liter bag weighs approximately 80–92 lbs for moist garden topsoil. Potting mix at the same volume would be considerably lighter — around 30–40 lbs.

How many pounds is 42 liters of soil?

Roughly 120–138 lbs for standard moist topsoil. For 42.5 liters the number is almost identical — 122–140 lbs.

How many pounds is 21 liters of dirt?

About 60–70 lbs for typical moist topsoil or dirt. Same answer whether you call it soil or dirt — the density is the same.

How much does 50 liters of soil weigh?

Roughly 65–75 kg (143–165 lbs) for standard moist topsoil. Potting mix at 50 liters weighs considerably less — around 25–30 kg.

How many kg is 50 litres of soil?

Approximately 65–75 kg for garden topsoil. For lighter potting mixes, expect closer to 25–35 kg for the same volume.

How heavy is 100 liters of soil?

Around 130–150 kg for typical moist topsoil. That’s roughly the weight of a large bulk sack at the lighter end.

Can I convert liters to kg directly for soil?

Not at a fixed rate — you need a density figure first. For a quick estimate, multiply your liters by 1.3 for dry topsoil or 1.5 for moist. For potting mix, use 0.5.

How much does a bag of soil weigh?

It depends entirely on the bag size. A small 20-liter bag runs about 28–32 lbs, while a large 100-liter bag can weigh 140–165 lbs. Check the bag sizes table above for the exact number for your bag.

How much does a bag of potting soil weigh?

Potting soil is much lighter than garden topsoil for the same volume. A 30-liter (32-quart) bag typically weighs 15–20 lbs, compared with 42–48 lbs for the same volume of topsoil.

How many pounds is 16 quarts of soil?

About 44–50 lbs for standard topsoil, or roughly 8–10 lbs if it’s a bagged potting mix instead.

How much does 50 quarts of potting soil weigh?

Roughly 24–32 lbs. Potting soil is lighter than garden topsoil, so don’t expect it to match a 50-quart bag of topsoil, which comes in closer to 137–156 lbs.

How many pounds is 14 liters of sand?

Dry sand runs heavier than soil — about 43–49 lbs for 14 liters, using a density of roughly 1.4–1.6 kg per liter.

How much does 50 liters of compost weigh?

Roughly 55–75 lbs (23–35 kg), using the same lighter density as potting mix.

How do I convert kg back to liters for soil?

Flip the formula around: Volume (liters) = Weight (kg) ÷ Density (kg/L). For moist topsoil, divide your kg figure by 1.3–1.5. So 16.3 kg of soil works out to roughly 11–12.5 liters.

How many liters are in a ton of soil?

A metric ton (1,000 kg) of moist topsoil works out to roughly 665–770 liters, using the same 1.3–1.5 kg/L density. Dry topsoil stretches a bit further, since it’s lighter per liter.

When to Use Other Calculators

This soil weight calculator answers one question: how heavy is this volume of soil?

If you need to figure out how many bags cover your garden bed, use the bags of topsoil calculator.

If you’re working out total volume in tons for a project in cubic yards, start with the soil tons calculator.

Need delivery or truckload planning? The truckload calculator has that covered.

To estimates cost, use cost of topsoil estimator

Right tool, right question. That’s all it takes.

 

Daniel

Founder & Editor – TopSoilCalcOnline.com

Daniel is the founder and primary editor of TopSoilCalcOnline.com, a practical resource built to help homeowners, landscapers, and contractors accurately calculate topsoil, compost, and soil mix requirements. With hands-on experience in lawn preparation, raised beds, topdressing, and bulk soil planning, Daniel focuses on turning complex volume calculations into simple, reliable tools. Every calculator and guide on this site is designed to reduce material waste, prevent over-ordering, and help users plan landscaping projects with confidence and precision.