One US gallon of loose leaves covers about 1.6 square feet at one inch deep. That is the whole trick. The rest of this page turns it into numbers for common enclosures, and shows how to work it out for yours.
The chart
| Enclosure | Floor | Leaves for a 1-inch layer | Leaves for a 2-inch layer | One-gallon bags for 1 inch |
|---|---|---|---|---|
| Small bin (6-quart shoebox) | 12 × 7 in | 0.4 gal | 0.7 gal | 1 |
| 12 × 12 in cube | 12 × 12 in | 0.6 gal | 1.2 gal | 1 |
| 10-gallon tank | 20 × 10 in | 0.9 gal | 1.7 gal | 1 |
| 18 × 18 in | 18 × 18 in | 1.4 gal | 2.8 gal | 2 |
| 20-gallon long | 30 × 12 in | 1.6 gal | 3.1 gal | 2 |
| 24 × 18 in | 24 × 18 in | 1.9 gal | 3.7 gal | 2 |
| 36 × 18 in (40 breeder) | 36 × 18 in | 2.8 gal | 5.6 gal | 3 |
| 48 × 24 in (4 × 2 ft) | 48 × 24 in | 5.0 gal | 10.0 gal | 5 |
The last column rounds up to whole bags for full floor coverage at one inch. Most setups do not cover the whole floor, so read on before you order five gallons for a four-foot tank.
Why tank gallons do not help
A tank's gallon rating is its total volume. Leaf litter only cares about the floor. A 20-gallon long and a 20-gallon tall hold the same water and have very different floors. Measure the length and width of the bottom and ignore the label.
The formula
Length × width × depth, all in inches, gives cubic inches. Divide by 231 to get US gallons.
Example: an 18 × 18 inch floor at 1 inch deep is 324 cubic inches. 324 ÷ 231 = 1.4 gallons.
If you only want to cover part of the floor, measure that part. A leaf corner that is 12 × 9 inches at 2 inches deep is 216 cubic inches, a bit under one gallon.
How deep should the layer be?
There is no single depth. These are common starting points, and the animals you keep have the final say:
- Isopod cultures: a loose layer a few leaves deep over most of the bin, roughly half an inch to an inch. See leaf litter for isopods.
- Dart frog and other tropical vivariums: at least an inch, and many frog keepers go deeper. See leaf litter for dart frogs.
- Bioactive reptile enclosures: often a scattered layer or a few leaf piles, because the animal also needs open substrate, basking spots, and a clear feeding area.
Three things that change the number
- Leaves settle. A fresh layer is fluffy. After a week of misting it sits lower. If you want a true inch after settling, start a little above it.
- Hardscape takes up floor. Wood, rocks, water dishes, and plants can cover a third of the floor or more. You are covering what is left.
- Leaf size matters. Small leaves such as live oak pack into more layers per inch than big magnolia leaves, so the same volume gives denser cover.
Plan for refills
Leaf litter gets eaten. A working cleanup crew thins the layer over time, and you add more when bare patches show. How fast depends on the crew, the moisture, and the temperature, so we do not promise a number of months per bag. A sensible approach for a new setup is to buy enough for the first layer plus about half again for top-ups, then reorder based on what you actually used.
Quick answers
How much does one gallon cover? About 231 square inches at one inch deep. That is a 12 × 19 inch patch, or roughly 1.6 square feet.
Is a "gallon" of leaves measured by weight? No. It is volume. Dry leaves weigh very little, so bags are sold by how much space the loose leaves fill.
How are your bags sold? Every bag is one gallon. A 2-gallon order is two bags, a 3-gallon order is three, and a 4-gallon order is four.
More from the leaf ranch
- Leaf litter for isopods: choosing and using live oak
- Do you need to boil or bake leaf litter?
- Which leaves are safe for isopods, and which to avoid
- Leaf litter for dart frog vivariums
- Live oak compared with other leaves
- What leaf litter is and how to use it in a terrarium
Know your number? Pick your bags.
Pick from 1–4 gallons and buy direct or choose your marketplace.
Shop Texas live oak leaf litter →