Deep pour epoxy layer calculator
Enter the size and total depth of the pour and the deepest layer your product allows. You get the number of layers and the epoxy for each one.
Result
Layers to pour
Depth of each layer
in
Epoxy per layer
US gal
| Total depth ÷ maximum depth per layer | 1.5 |
|---|---|
| Layers = that number rounded up to a whole number | 2 |
| Depth of each layer = total depth ÷ layers | 1.50 in |
| Epoxy for the whole pour = length × width × total depth | 5.61 US gal |
| Epoxy per layer = whole pour ÷ layers | 2.81 US gal |
How it works
The total depth is divided by the deepest layer your product allows, and the result is rounded up to a whole number of layers. The pour is then split into equal layers, so every layer stays at or under the limit, and the epoxy for the whole pour is shared between them.
Formula
Layers = total depth ÷ maximum depth per layer, rounded up. Depth of each layer = total depth ÷ layers. Epoxy for the whole pour = length × width × total depth. Epoxy per layer = whole pour ÷ layers. A depth that is an exact multiple of the limit is not rounded up: 6 inches with a 2 inch limit is 3 layers.
Worked example
The calculator opens with this example; the result above is computed from it.
| Input | Value |
|---|---|
| Length of the pour | 72 in |
| Width of the pour | 6 in |
| Total depth | 3 in |
| Maximum depth per layer | 2 in |
| Layers to pour | 2 |
| Depth of each layer | 1.50 in |
| Epoxy per layer | 2.81 US gal |
A pour 3 in deep with a limit of 2 in per layer takes 2 layers of 1.50 in each. At 72 in by 6 in, each layer needs 2.81 US gal of mixed epoxy and the whole pour 5.61 US gal.
Common cases
| Case | Starting values | Layers to pour | Depth of each layer | Epoxy per layer |
|---|---|---|---|---|
| Three-inch river, product limited to two inches per layer | Length of the pour 72 in; Width of the pour 6 in; Total depth 3 in; Maximum depth per layer 2 in | 2 | 1.50 in | 2.81 US gal |
| Two-inch river, product limited to one inch per layer | Length of the pour 72 in; Width of the pour 8 in; Total depth 2 in; Maximum depth per layer 1 in | 2 | 1.00 in | 2.49 US gal |
| Five-inch block casting, product limited to two inches per layer | Length of the pour 12 in; Width of the pour 12 in; Total depth 5 in; Maximum depth per layer 2 in | 3 | 1.67 in | 1.04 US gal |
| River one and a half inches deep, product limited to two inches: one pour | Length of the pour 72 in; Width of the pour 6 in; Total depth 1.5 in; Maximum depth per layer 2 in | 1 | 1.50 in | 2.81 US gal |
Questions and answers
How many layers of epoxy does a river table need?
Divide the total depth by the deepest single pour your product's data sheet allows, and round up. A pour 3 in deep with a limit of 2 in per pour needs 2 layers of 1.50 in each, and each layer takes 2.81 US gal of mixed epoxy.
Can the whole depth go in as one pour?
Only when the total depth is no more than the product's limit for a single pour. A pour 1.5 in deep with a limit of 2 in is 1 layer of 2.81 US gal. The limit comes from the data sheet of your product, not from this page.
Assumptions and limits
- The maximum depth per layer is your figure, taken from the product. The calculator does not know any product and does not check the figure.
- The pour is split into equal layers. You can pour unequal layers as long as none is deeper than the limit; the total epoxy stays the same.
- The pour is treated as a rectangle with straight sides. For a river, use the average width of the gap.
- No waste allowance is added. The volume calculator adds one and splits the amount into resin and hardener.
- Some products give different limits for small castings and for long river tables. Use the one that fits your project.
The result is an estimate for planning, not professional advice.
Sources
- Jeff Mack Supply epoxy resin calculator: deep pours are calculated by volume (length x width x depth); the number of pours is the depth divided by the resin's maximum single-pour depthretrieved 2026-10-12
- UltraClear Epoxy help: maximum thickness per layer (bar and table top 1/8 inch; deep pour 2 inches; one inch layers repeated until the goal depth is reached)retrieved 2026-10-12
- MAS Deep Pour X technical data bulletin (revised October 2020): 'cast 3 inches thick in a single pour'retrieved 2026-10-12
- Omni Calculator, epoxy calculator: Volume = length x width x height, worked example 96 x 48 x 1 inretrieved 2026-10-12
Last updated:
Method in depth: Epoxy volume formula: how much resin a pour or a coat needs
Cite this page: Resin Math, “Deep pour epoxy layer calculator”, https://resin-math.pages.dev/epoxy-pour/deep-pour-epoxy-layer-calculator/ (updated 12 October 2026).
Found a mistake? Email handycalc.sites+resinmath@gmail.com.