Easy Epoxy Calc

How much epoxy for a 180 cm river table?

Short answer

You need about 16.4 liters of mixed epoxy for a 180 cm river table with a river averaging 20 centimetres wide on 4-centimetre slabs — 14.9 liters fills the channel, poured 1.5 millimetres proud, and the rest is a 10% waste allowance.

How to work it out

  1. 180 cm × 20 cm × (4 cm + 1.5 mm proud) = 14,940 cm³ = 14.9 L
  2. + 10% waste = 16.4 L → 2 × 12 L kits
  3. Lifts: 4.15 cm ÷ 5 cm per layer → 1 lift
  4. Batches: 16.4 L ÷ 6 L max → 3 → A 3.65 L (4.2 kg) + B 1.83 L (1.77 kg) each
  5. Mix ratio 2 : 1 by volume, SG A 1.15 / B 0.97 (typical, not published by the maker — type your data sheet’s SGs for exact weights) → Part A 11 L (12.6 kg) + Part B 5.48 L (5.31 kg)

In metric the arithmetic is pleasantly simple: centimetres multiplied together give milliliters, so 180 × 20 × 4 = 14,400 ml, or 14.4 liters at slab depth. Pouring 1.5 mm proud for flattening adds 180 × 20 × 0.15 = 540 ml, for 14.9 liters before waste. A 180 cm table is the usual six-seater size in Europe, typically 90–100 cm wide overall.

Adjust for your project

cm
cm
Measure across the gap, not the whole table — the diagram just below the calculator shows where.
cm
Your slab thickness at the thickest spot. About 1.5 mm extra, so you can sand it flat, is added for you (“Pour proud” under More options). Many deep-pour resins also have a minimum depth — often 5 cm.
cm
On the label as “max pour depth”. Not bought yet? Leave 5 cm — many deep-pour epoxies allow 2.5–5 cm per layer.
Total of both bottles together (e.g. 2 L + 2 L = 4). Sold by weight? Pick “Another size” and enter the kg ÷ 1.1 as liters (roughly).
More options: waste · proud · product …
%
Cup and bucket film, small leaks, the seal coat on the live edges. Use 15% for very open or punky wood.
mm
Resin poured above the wood so the whole top can be sanded flat — about 1.5 mm is typical. Enter 0 if you already added it to the depth.
Fills in the mix ratio, weights and depth limits from the maker’s published data, and hides those fields. Always check the data sheet that comes with your batch.
cm
From the label — e.g. MAS Deep Pour X 5 cm, FlowCast 1.3 cm
L
Some labels lower the deepest layer for big pours, or cap the volume per layer. Enter that volume here; leave blank if your label doesn’t.
ml
Open knots and cracks that join the river fill up too. A rough guess is fine: a 2 × 2 × 8 cm knot holds about 32 ml.
Only changes the Part A / Part B split — it’s printed on the kit. Tabletop and art resins are usually 1:1; deep pour often 2:1.
From the TDS, in g/ml. Leave blank for 1.15 (typical, not published by the maker).
From the TDS, in g/ml. Leave blank for 0.95 on 1:1 kits or 0.97 on other ratios (typical, not published by the maker).
L
Resin + hardener mixed in one bucket. Leave blank to mix one whole kit at a time; enter less (1.5 gal or 6 L is easy with a drill paddle) to split each lift into batches you pour back to back.
From the label: when the next layer can go on (the recoat window) at room temperature. Leave blank to skip the pour schedule.
From the label: how long after the last pour before the table can come out of the form.
$
Optional — your kit price, for a cost estimate
Deep-pour epoxy to buy16.4 L4.34 gal
In short
Buy 2 × 12 L deep-pour kits. Pour the river in one layer, mixed in three batches.
What the resin will weigh in the table (for the form and legs)
16.4 kg (36.2 lb)
Left over from the last kit
7.57 L (2 gal)
Mixing details: batches, Part A and Part B
Mixing details: batches, Part A and Part B
Part A (resin)Part B (hardener)
Each batch (3 in all)3.65 L · 4.2 kg1.83 L · 1.77 kg
Whole job11 L · 12.6 kg5.48 L · 5.31 kg
  • What to buy: 2 × 12 L deep-pour epoxy kits. Each kit has both bottles (resin + hardener) — you don’t buy them separately.
  • Check the label’s minimum depth too. Many deep-pour resins list a minimum pour as well as a maximum — MAS Deep Pour X, for one, wants at least 2 in, and thinner pours cure slowly or stay soft. At 4.15 cm, choose a resin whose range includes that depth, and type its minimum under Min depth per pour (More options) to check.
  • Mix 3 batches of about 5.48 L and pour them back to back into the same layer, before they start to thicken. Some labels also cap the mass per pour — check yours.
  • Seal the live edges and any bark with a thin coat first — dry wood soaks up epoxy and releases bubbles into the pour.
  • About 7.57 L will be left in the jugs. Kept sealed, it fills knots and cracks later, or makes a practice river board.

For this job · affiliate link
Deep pour epoxy, 3-gallon-plus kitYou need 16.4 L — 2 × 12 L kits. Bigger deep-pour kits are usually cheaper per liter than a stack of small ones. Pick one whose label range includes 4.15 cm per pour — the minimum as well as the maximum.
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180 cm river table epoxy by average river width (180 cm long, 4 cm slabs)

180 cm river table epoxy by average river width (180 cm long, 4 cm slabs)
Average river widthDeep-pour epoxy to buyKits to buyLeft over from the last kit
15 cm12.3 L2 kits11.7 L
20 cm16.4 L2 kits7.57 L
25 cm20.5 L2 kits3.46 L
30 cm24.7 L3 kits11.3 L

What to know about a 180 cm river table

Kits in liters. Kit sizes vary by brand, so pick the one you are actually buying in Size of the kit you’re buying — or Another size if it isn’t listed. At 16.4 liters, two 12 L kits leave about 7.57 L over, while three 6 L kits make 18 L and leave about 1.57 L. Kits sold by weight are roughly their kilograms ÷ 1.1 in liters; try yours in the calculator before you order.

4 cm is a finished thickness. Slabs are usually sawn a little thicker and flattened, so measure after flattening and enter the thickest point. Many deep-pour resins are rated for around 5 cm per pour, which covers this 4.15 cm pour in a single lift — but not all. If your label says 2.5 cm, put that in Deepest layer your epoxy allows and plan two layers.

Mixing. With a 6 liter largest batch (set in this example), the pour is three batches of about 5.48 liters, each about 3.65 L (4.2 kg) of Part A and 1.83 L (1.77 kg) of Part B for a 2:1 resin. Weighing on a scale is easier than juggling measuring jugs at this size, if your label allows it.

What the resin weighs. The 14.9 liters that stay in the table weigh about 16.4 kg, because epoxy is a little denser than water — typically around 1.1 kg per liter. That the figure matches the 16.4 liters you buy is a coincidence of the 10% allowance and that density, not a rule: the extra liter and a half never reaches the table.

Building in inches? How much epoxy for a 6 ft river table is the same table (180 cm is about 71 in). For a two-metre table on thicker slabs, see How much epoxy for a 200 cm river table.

Different size? Use the full River Table Epoxy Calculator.

What you’ll need

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Frequently asked questions

How much epoxy for a 180 cm river table with a 25 cm river?

About 20.5 liters with 10% waste — 2 kits of 12 L, with 3.46 L to spare.

How many 6 liter kits for a 180 cm river table?

3 kits of 6 L cover the 16.4 liters, leaving 1.57 L over.

How much tabletop epoxy to coat the top of a 180 cm river table?

About 5.93 liters of tabletop epoxy — 2 kits of 4 L — for one 3 mm coat over a 180 × 90 cm top, counting the drips and the film on its 4 cm edges plus 5% for the bucket. That’s separate from the 16.4 L of deep pour.

Other common sizes

Sources