River Table Epoxy Planning Guide
Why Accurate Estimation Matters
A river table looks simple, yet its resin volume can change fast. The live edge gap is rarely a perfect rectangle. Curves, knots, bark pockets, and uneven slabs all add uncertainty. A careful estimate helps you buy enough resin without storing a large surplus.
Measure the River Shape
Start with length, average river width, and pour depth. Use the same unit for all three values, or select a unit in this tool. The calculator converts the volume into liters, milliliters, gallons, fluid ounces, cubic inches, and cubic centimeters. It also applies waste and void allowances. These allowances cover mixing loss, cup residue, minor leaks, bubbles, and low spots.
Use Segment Widths
For segmented rivers, measure the gap at several points. Enter each width separated by commas. The tool averages those values and uses the result as the working width. This is usually better than one quick guess. If the table has islands, branches, or a wide delta, split the design into sections and calculate each section separately.
Plan Safe Layers
Depth matters most. A small depth change can add a large amount of epoxy across a long table. Deep pours may also need several layers. The layer estimate compares your total depth with the maximum pour thickness you select. Always follow the resin maker’s limit, because heat buildup can cause cracks, yellowing, waves, or soft spots.
Estimate Cost and Mix
The cost estimate uses resin density and price. Density turns volume into weight. That helps when resin is sold by kilogram or pound. The mix ratio section divides the total resin system into Part A and Part B. You can use a two to one, one to one, or custom ratio. Pigment is estimated as a small percentage of the resin system.
Prepare Before Pouring
Good preparation still matters after calculation. Seal porous wood before the main pour. Level the mold. Clamp the slabs well. Test for leaks with a small amount first. Keep the room within the recommended temperature range. Record your numbers before mixing. This calculator gives a strong planning estimate, but real wood can surprise you. Add a sensible safety margin when the slab is irregular, cracked, or very dry. When in doubt, mix in planned batches, not one oversized batch, so timing, bubbles, and cleanup remain easier during long pours at home.