Easy Epoxy Calc

How much epoxy for a 6 ft river table?

Short answer

You need about 4.29 gallons of mixed epoxy for a 6 ft river table with a 72-inch river averaging 8 inches wide on 1.5-inch slabs, including a 10% waste allowance (3.9 gallons before waste, poured 1/16 inch proud).

How to work it out

  1. 72 in × 8 in × (1-1/2 in + 1/16 in proud) = 900 cu in = 3.9 gal
  2. + 10% waste = 4.29 gal → 2 × 3 gal kits
  3. Lifts: 1-9/16 in ÷ 2 in per layer → 1 lift
  4. Batches: 4.29 gal ÷ 1.5 gal max → 3 → A 3.81 qt (9.14 lb) + B 1.9 qt (3.85 lb) 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 2.86 gal (27.4 lb) + Part B 1.43 gal (11.6 lb)

Six feet (72 in) is the most common dining-table length — six seats, usually 36–40 in wide overall. With an 8 in river the channel is 864 cubic inches at slab depth, or 900 once you pour 1/16 in proud for flattening — 3.9 gallons — and the width of the river swings the total more than anything else you enter.

Adjust for your project

in
in
Measure across the gap, not the whole table — the diagram just below the calculator shows where.
in
Your slab thickness at the thickest spot. About 1/16 in 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 2 in.
in
On the label as “max pour depth”. Not bought yet? Leave 2 in — many deep-pour epoxies allow 1–2 in per layer.
Total of both bottles together. Most “1 gallon kits” are ½ gal resin + ½ gal hardener — enter 1. If the listing says 1 gal of EACH, enter 2.
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.
in
Resin poured above the wood so the whole top can be sanded flat — 1/16 in 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.
in
From the label — e.g. MAS Deep Pour X 2 in, FlowCast 1/2 in
gal
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.
fl oz
Open knots and cracks that join the river fill up too. A rough guess is fine: a 1 × 1 × 3 in knot holds about 1.7 fl oz.
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).
gal
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 buy4.29 gal17.1 qt · 16.2 L
In short
Buy 2 × 3 gal 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)
35.8 lb (16.2 kg)
Left over from the last kit
1.71 gal (6.86 qt · 6.49 L)
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)3.81 qt · 9.14 lb1.9 qt · 3.85 lb
Whole job2.86 gal · 27.4 lb1.43 gal · 11.6 lb
  • What to buy: 2 × 3 gal 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 1-9/16 in, 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 1.43 gal 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 1.71 gal 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 4.29 gal — 2 × 3 gal kits. Bigger deep-pour kits are usually cheaper per gallon than a stack of small ones. Pick one whose label range includes 1-9/16 in per pour — the minimum as well as the maximum.
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6 ft river table epoxy by average river width (72 in long, 1.5 in slabs)

6 ft river table epoxy by average river width (72 in long, 1.5 in slabs)
Average river widthDeep-pour epoxy to buyKits to buyWhat the resin will weigh in the table (for the form and legs)
6 in3.21 gal2 kits26.8 lb
8 in4.29 gal2 kits35.8 lb
10 in5.36 gal2 kits44.7 lb
12 in6.43 gal3 kits53.6 lb
14 in7.5 gal3 kits62.6 lb

What to know about a 6 ft river table

Width is the big lever. At this length and depth, every extra inch of average river width adds about half a gallon of mixed epoxy — the width table above shows it step by step. A pair of slabs that looks like an 8 in river at the middle but flares to 14 in at one end can easily average 10 in, so take five readings before you order, not one across the middle.

Kits and the leftover. 4.29 gallons means two 3-gallon kits with about 1.71 gallons over, or a 3 plus a 1.5 with only about 0.2 gallons spare on top of the waste allowance — a tight fit for a first pour. The bigger leftover is useful if you keep it sealed: it will fill knots, checks and bark pockets in the slab faces later. Don’t use it for the seal coat, though — slow deep-pour resins stay soft for a long time, and MAS suggests sealing with a faster epoxy.

Mixing three batches. With a 1.5 gallon largest batch the pour is three batches of about 1.43 gallons. For a 2:1 resin each one is about 3.81 qt (9.14 lb) of Part A and 1.9 qt (3.85 lb) of Part B; over the whole job that is 2.86 gallons (27.4 lb) of Part A and 1.43 gallons (11.6 lb) of Part B.

The form carries the weight. About 35.8 lb of liquid resin sits in the channel, pressing on every taped seam and caulked corner of the form. Any seam you skipped will find the leak, usually an hour after you have walked away. Pour the batches back to back so the layer stays continuous.

One size down is How much epoxy for a 5 ft river table; one up is How much epoxy for a 7 ft river table. In metric, How much epoxy for a 180 cm river table is essentially the same table — 180 cm is about 71 in.

Different size? Use the full River Table Epoxy Calculator.

What you’ll need

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Frequently asked questions

How much does the epoxy in a 6 ft river table weigh?

About 36 lb for the 8 in wide example on 1.5 in slabs, at a typical 1.1 g/ml. That is the resin left in the table after the waste allowance; plan the form and the legs for it on top of the slabs.

How much epoxy for a 6 ft river table with a 12 in river?

About 6.43 gallons with 10% waste (5.84 gal of channel) — 3 kits of 3 gal.

How much epoxy for a 6 ft river table with 2 inch slabs?

About 5.66 gallons at 8 in wide, which two 3 gal kits still cover with 0.34 gal spare — in 2 pours if your resin is rated for 2 in per layer.

How much tabletop epoxy to coat the top of a 6 ft river table?

About 1.7 gallons of tabletop epoxy — 2 kits of 1 gallon — for one 1/8 in coat over a 72 × 36 in top, counting the drips and the film on its 1.5 in edges plus 5% for the bucket. That’s on top of the 4.29 gal of deep pour for the river.

Other common sizes

Sources