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. Pick your material — soil, potting mix, or plain water. 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.

For the basics behind these numbers, see our guide to what topsoil is made of and how moisture, minerals, and organic matter affect it.

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 121–143 lbs. Wet or compacted soil at the same volume can push past 165 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.

Soil, Sand & Compost Density Reference (kg and lbs per Liter)

Every conversion on this page comes back to one number: density. Here’s a quick side-by-side reference for the materials people ask about most, including plain water for comparison:

Material	kg per liter	lbs per liter
Water (for comparison)	1.00 kg/L	2.20 lbs/L
Dry topsoil / potting soil	1.1–1.3 kg/L	2.4–2.9 lbs/L
Damp / standard topsoil	1.3–1.5 kg/L	2.9–3.3 lbs/L
Potting mix / compost	0.4–0.7 kg/L	0.9–1.5 lbs/L
Sand (dry)	1.4–1.6 kg/L	3.1–3.5 lbs/L
Clay-heavy soil (wet)	1.6 kg/L or more	3.5 lbs/L or more

Soil is almost always heavier than water. The one exception is very light, dry potting mix, which can sometimes sit close to or even below water’s density because of all the air pockets and organic matter mixed in.

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 standard moist/damp topsoil density (2.9–3.3 lbs per liter, or 1.3–1.5 kg per liter — the same range used throughout this page).

Small Volumes (1 to 18 Liters)

Small liter figures usually come up for potting containers, sand, or a single scoop rather than a full bag:

Volume	Approx. Weight (lbs)	Approx. Weight (kg)
1 liter	2.9–3.3 lbs	1.3–1.5 kg
1.5 liters	4.3–4.9 lbs	2.0–2.2 kg
3 liters	8.7–9.9 lbs	3.9–4.5 kg
5 liters	14–16 lbs	6.5–7.5 kg
6 liters	17–20 lbs	7.8–9.0 kg
7 liters	20–23 lbs	9.1–10 kg
8 liters	23–26 lbs	10–12 kg
9 liters	26–30 lbs	12–14 kg
10 liters	29–33 lbs	13–15 kg
11 liters	32–36 lbs	14–16 kg
12 liters	35–40 lbs	16–18 kg
14 liters	41–46 lbs	18–21 kg
16 liters	46–53 lbs	21–24 kg
18 liters	52–59 lbs	23–27 kg

Common Bag & Container Sizes (20 to 100 Liters)

These are the retail bag sizes topsoil, compost, and potting soil are most often sold in:

Bag Volume	Approx. Weight (lbs)	Approx. Weight (kg)
20 liters	58–66 lbs	26–30 kg
21 liters	61–69 lbs	27–32 kg
22 liters	64–73 lbs	29–33 kg
24 liters	70–79 lbs	31–36 kg
25 liters	72–82 lbs	32–38 kg
27 liters	78–89 lbs	35–40 kg
28 liters	81–92 lbs	36–42 kg
28.3 liters	82–93 lbs	37–42 kg
30 liters	87–99 lbs	39–45 kg
32 liters	93–106 lbs	42–48 kg
35 liters	102–116 lbs	46–52 kg
36 liters	104–119 lbs	47–54 kg
40 liters	116–132 lbs	52–60 kg
42 liters	122–139 lbs	55–63 kg
42.5 liters	123–140 lbs	55–64 kg
45 liters	130–148 lbs	58–68 kg
50 liters	145–165 lbs	65–75 kg
55 liters	160–182 lbs	72–82 kg
56 liters	162–185 lbs	73–84 kg
56.6 liters	164–187 lbs	74–85 kg
60 liters	174–198 lbs	78–90 kg
65 liters	188–214 lbs	84–98 kg
70 liters	203–231 lbs	91–105 kg
75 liters	218–248 lbs	98–112 kg
80 liters	232–264 lbs	104–120 kg
84.9 liters	246–280 lbs	110–127 kg
85 liters	246–280 lbs	110–128 kg
90 liters	261–297 lbs	117–135 kg
95 liters	276–314 lbs	124–142 kg
100 liters	290–330 lbs	130–150 kg

Bulk & Large Volumes (110 Liters and Up)

For bulk bags, small trailer loads, and delivery-planning quantities:

Volume	Approx. Weight (lbs)	Approx. Weight (kg)
110 liters	319–363 lbs	143–165 kg
120 liters	348–396 lbs	156–180 kg
140 liters	406–462 lbs	182–210 kg
150 liters	435–495 lbs	195–225 kg
160 liters	464–528 lbs	208–240 kg
500 liters	1,450–1,650 lbs	650–750 kg
600 liters	1,740–1,980 lbs	780–900 kg
750 liters	2,175–2,475 lbs	975–1,125 kg
900 liters	2,610–2,970 lbs	1,170–1,350 kg

These figures assume standard moist/damp garden topsoil. For potting mix, expect roughly 30–50% of these weights. For wet clay soil, expect the higher end or beyond. Use the calculator at the top of the page for any exact volume not listed here, or to switch between dry, damp, and wet moisture conditions.

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:

• 14L soil to kg → roughly 18–21 kg
• 20L soil in kg → roughly 26–30 kg
• 25L soil to kg → roughly 33–38 kg
• 30 liters to kg → roughly 39–45 kg
• 40L soil in kg → roughly 52–60 kg
• 45L soil in kg → roughly 58–68 kg
• 50L soil in kg → 50 × 1.3 = 65 kg (dry end) up to 50 × 1.5 = 75 kg (moist)
• 60L of soil in kg → roughly 78–90 kg
• 65L of soil in kg → roughly 84–98 kg
• 90L of soil in kg → roughly 117–135 kg
• 100L of soil in kg → roughly 130–150 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:

• 3 liters of soil to pounds → roughly 8.7–9.9 lbs
• 5 liters of soil to pounds → roughly 14–16 lbs
• 6 liters of soil to pounds → roughly 17–20 lbs
• 9 liters of soil to pounds → roughly 26–30 lbs
• 14 liters to pounds → roughly 41–46 lbs
• 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
• 42 liters of soil to pounds → roughly 120–138 lbs
• 45 liters of soil to pounds → roughly 130–148 lbs
• 47 liters of soil to pounds → roughly 136–155 lbs (close to the 42.5-liter figure above)
• 50 liters of soil to pounds → roughly 143–165 lbs
• 56 liters of soil to pounds → roughly 160–185 lbs
• 65 liters of soil to pounds → roughly 188–214 lbs
• 85 liters of soil to pounds → roughly 243–280 lbs
• 90 liters of soil to pounds → roughly 261–297 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

Sand Weight Conversions

Sand is denser than garden topsoil, so expect noticeably higher numbers for the same volume. Using dry sand’s typical density (1.4–1.6 kg/L, or 3.1–3.5 lbs per liter):

• 1 liter of sand → roughly 3.1–3.5 lbs (1.4–1.6 kg)
• 5 liter sand to kg → roughly 7–8 kg (15–18 lbs)
• 10 liter sand to kg → roughly 14–16 kg (31–35 lbs)
• how many pounds is 14 liters of sand → roughly 43–49 lbs (20–22 kg)
• 14.1 liters of sand to pounds → roughly 43–49 lbs (20–23 kg)
• 20l sand in kg → roughly 28–32 kg (62–71 lbs)

Wet sand is heavier again — treat the figures above as a dry-sand baseline and expect more toward the top of the range (or beyond it) if the sand is damp.

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)

Gallons, Cubic Feet & Cubic Meters

The calculator at the top of this page also accepts cubic feet, cubic yards and cubic meters directly, so you don’t have to convert to liters first. For quick reference, using standard moist topsoil density:

• how much does a gallon of soil weigh → roughly 11–12.5 lbs (4.9–5.7 kg) per US gallon (3.785 L)
• how much does 5 gallons of soil weigh → roughly 55–62 lbs (25–28 kg)
• how much does 20 gallons of soil weigh → roughly 220–250 lbs (98–114 kg)
• 1 cubic foot of soil (28.3 L) → roughly 82–93 lbs (37–42 kg) — see the 28.3-liter row in the table above
• 1 cubic yard of soil (764.6 L) → roughly 2,217–2,523 lbs (994–1,147 kg)
• how much does a cubic meter of soil weigh → roughly 1,300–1,500 kg (2,900–3,300 lbs) per 1,000 liters

Converting Kilograms or Pounds Back to Liters

Sometimes you know the weight and need the volume instead. Flip the density formula around: Volume (liters) = Weight (kg) ÷ Density (kg/L).

• 1.3 kg of dry topsoil → roughly 1.0–1.2 liters
• 1.5 kg of dry topsoil → roughly 1.15–1.36 liters
• 1.6 kg of dry topsoil → roughly 1.23–1.45 liters
• 16.3 kg of moist topsoil → roughly 11–12.5 liters

For pounds, convert to kg first (divide by 2.20462), then apply the same formula.

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.

What is the density of potting soil in kg per liter?

Potting soil and potting mix typically run 0.4–0.7 kg per liter (0.9–1.5 lbs per liter) — much lighter than garden topsoil, thanks to the perlite, peat, and organic matter mixed in.

Is soil heavier than water?

Yes. A liter of water weighs exactly 1 kg, while a liter of even dry topsoil weighs 1.1–1.3 kg. Damp topsoil is nearly 1.5 times heavier than the same volume of water. The one exception is very light, dry potting mix, which can sometimes weigh close to or even less than water.

How much does a gallon of soil weigh?

One US gallon (3.785 liters) of moist topsoil weighs roughly 11–12.5 lbs (4.9–5.7 kg). Dry soil weighs somewhat less; wet or clay-heavy soil weighs more.

How much does a cubic meter of soil weigh?

A cubic meter (1,000 liters) of moist topsoil weighs roughly 1,300–1,500 kg (2,900–3,300 lbs). That’s why soil delivered in bulk is usually priced and measured by the cubic meter or cubic yard rather than by weight alone.

How many pounds is 14 liters of soil?

About 41–46 lbs (18–21 kg) for standard moist topsoil. Dry topsoil at the same volume comes in lighter, around 34–40 lbs.

How many liters are in a kg of soil?

For moist topsoil, 1 kg works out to roughly 0.67–0.77 liters. For dry topsoil, it stretches a bit further — about 0.77–0.91 liters per kg.

Can this calculator convert water or other liquids, not just soil?

Yes. Select “Water (1 L = 1 kg)” from the Moisture Condition dropdown for an exact 1:1 conversion. A liter of water always weighs exactly 1 kg (2.2046 lbs), unlike soil, whose weight varies with moisture and material. Use this setting for plain water or any liquid close to water’s density.

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.