// Precision Mode · River Tables

Surveyor-Grade River Table
Epoxy Calculator

Enter width measurements at multiple cross-sections along your slab, and we'll calculate your exact epoxy volume using the trapezoidal rule — the same technique used in civil engineering.

● Up to 10× more accurate than average-width estimates
1
River Length & Sections
Units:
Imperial (in/gal)
Metric (cm/L)
Measure end-to-end along the length of the epoxy section
7 points
3 — rough estimate 15 — high precision
2
Width at Each Point
How to measure: Divide your river's length into equal segments and measure the width at each division point. Point 1 is at one end, the last point is at the other end. Even if the width is zero at the ends (ends of a river), enter 0.
Point Width
3
Pour Depth
Uniform DepthSame depth throughout
Variable DepthDifferent at each point
Depth of the epoxy pour from bottom to top
10%
0% — precise25% — complex
// Total Epoxy Required
0.00
Gallons
Calculated via trapezoidal integration across 7 measurement points
Surface Area
—
Net Volume
—
Waste Buffer
—
Pour Type
—

Your River Profile

This is a top-down representation of the epoxy area based on your measurements. Scale is proportional.

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Recommended Products

* Product links are affiliate links. Always verify kit size before purchasing.

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Pro Tips for Your Pour

How This Calculator Works

01
Divide into segments
We split your river's length into equal sections based on your point count.
02
Measure width at each
You measure the physical width at each division. More points = more accuracy.
03
Integrate the area
We use the trapezoidal rule: Σ ½(w₁ + w₂) × Δx across all segments.
04
Multiply by depth
Area × depth = volume, plus waste buffer. Far more accurate than avg-width math.