River Tables
Measure several river widths. Subtract embedded wood and decorative objects.
Planning notice
Product formulas and pour limits vary. Always follow the manufacturer instructions.
Project presets
Choose a preset, then review every populated value.
Calculation History
Recent calculations stay inside this browser.
No saved calculations appear yet.
Formula Used
The calculator first finds the project area or volume.
Surface area = Shape dimensions converted into square meters
Coating volume = Surface area × Coating thickness × Coat count
Adjusted volume = Net volume × (1 + Total allowance percentage)
Resin amount = Mixed amount × A ÷ (A + B)
Hardener amount = Mixed amount × B ÷ (A + B)
Required kits = Ceiling(Final volume ÷ Available kit volume)
Object displacement is deducted before allowances are added.
Edge areas use perimeter multiplied by edge height.
How To Use This Calculator
- Select the closest project preset.
- Choose the correct surface shape.
- Enter finished dimensions and units.
- Set coating thickness and coat count.
- Add waste and absorption allowances.
- Enter the manufacturer mix ratio.
- Select an available kit size.
- Add prices and optional project costs.
- Calculate and review every recommendation.
- Round purchases upward before ordering.
Example Data Table
| Project | Dimensions | Thickness | Allowance | Approximate Mixed Volume |
|---|---|---|---|---|
| Small tabletop | 36 × 18 inches | 1/8 inch | 10% | About 1.46 liters |
| Kitchen counter | 8 × 2 feet | 1/8 inch | 12% | About 6.76 liters |
| Garage floor | 20 × 20 feet | 1 millimeter | 15% | About 42.70 liters |
| River channel | 72 × 8 inches | 2 inches | 10% | About 20.77 liters |
| Round artwork | 24-inch diameter | 2 millimeters | 10% | About 0.64 liters |
| Box mold | 12 × 8 × 2 inches | Full depth | 8% | About 3.40 liters |
Coverage And Thickness Reference
| Application | Common Thickness | Typical Purpose | Planning Note |
|---|---|---|---|
| Seal coat | 0.25–0.75 millimeters | Reduce bubbles and absorption | Apply before thicker coats. |
| Thin artwork coat | 1–2 millimeters | Gloss and surface protection | Level the artwork carefully. |
| Flood coat | 3 millimeters | Tables and countertops | Check edge runoff losses. |
| Thick flood coat | 6 millimeters | Heavy decorative coating | Confirm maximum pour depth. |
| Deep casting | 12–50 millimeters | River tables and molds | Use suitable casting resin. |
| Floor system | 0.5–3 millimeters | Primer, base, and topcoat | Follow product coverage data. |
Mix Ratio Reference
| Ratio | Resin Share | Hardener Share | Example Total |
|---|---|---|---|
| 1:1 | 50% | 50% | 500 mL plus 500 mL |
| 2:1 | 66.67% | 33.33% | 667 mL plus 333 mL |
| 3:1 | 75% | 25% | 750 mL plus 250 mL |
| 4:1 | 80% | 20% | 800 mL plus 200 mL |
| 5:1 | 83.33% | 16.67% | 833 mL plus 167 mL |
| 100:30 | 76.92% | 23.08% | 769 g plus 231 g |
Planning Reliable Epoxy Coverage
Measure Finished Dimensions
Reliable estimates begin with careful finished measurements. Measure every coated surface before buying materials. Include edges when epoxy will cover them. Deduct openings, drains, and permanent equipment. Irregular projects need several smaller measured sections. Add those sections after calculating each area. River tables require an average channel width. Measure narrow and wide points separately. Their average improves the volume estimate. Deep molds need internal dimensions, not external dimensions.
Choose A Practical Thickness
Thickness strongly changes the required epoxy amount. A doubled thickness needs twice the mixed volume. Seal coats remain thin and reduce absorption. Flood coats create a smooth protective surface. Deep pours require specialized casting products. Never assume every resin supports deep layers. Check the stated maximum depth before mixing. Thick batches can generate dangerous curing heat. Divide deep projects into approved layers. Let each layer reach its required stage.
Allow For Real Losses
Perfect laboratory coverage rarely occurs during application. Mixing containers retain a small epoxy amount. Stirring tools also hold usable material. Rough surfaces demand more coating than smooth surfaces. Unsealed wood can absorb the first coat. Cracks and knots may consume surprising quantities. Floor texture creates many tiny low areas. Add a sensible waste allowance for these losses. Ten percent suits many controlled tabletop projects. Rough floors may need a larger allowance. Avoid excessive allowances that create costly leftovers.
Use The Exact Mix Ratio
Epoxy performance depends on accurate component proportions. Some products specify ratios by volume. Other products specify ratios by weight. These methods are not automatically interchangeable. Resin and hardener can have different densities. Use separate clean containers when practical. Measure both parts with suitable equipment. Scrape container walls during thorough mixing. Transfer the mixture into another clean cup. Mix again when instructions recommend double mixing. Incorrect ratios can leave soft or sticky areas.
Plan Kits And Batches
Purchase enough complete kits for the estimate. Partial kits can complicate accurate measuring. Round the calculated requirement upward before ordering. Check whether listed kit sizes show mixed volume. Some labels show only resin component volume. Divide large pours into manageable mixing batches. Smaller batches reduce uncontrolled heat buildup. They also improve pouring speed and accuracy. Prepare pigments, tools, and molds beforehand. Record every batch size for consistent color. Keep extra material for small repairs.
Review Conditions Before Pouring
Temperature affects viscosity, bubbles, and curing speed. Cold resin flows slowly and traps air. Excessive warmth shortens the working time. Moisture can create cloudy or weak surfaces. Confirm safe humidity and temperature ranges. Level the workpiece before starting the pour. Protect nearby surfaces from drips and spills. Wear the protection stated by the manufacturer. Ventilate the workspace according to product guidance. Store unopened kits within the recommended temperature range. Label leftover components clearly. Keep batch records beside the finished project for reference. Careful planning keeps every epoxy project cleaner and safer.
Project Guidance
Floor Coatings
Include primer, base coats, broadcasts, and protective topcoats.
Artwork
Allow runoff losses around edges. Level the work before pouring.
Mold Casting
Use internal mold dimensions. Deduct every embedded object accurately.
Frequently Asked Questions
How much extra epoxy should I buy?
Many projects use five to fifteen percent extra material.
Can I use coverage rates from another brand?
No. Product viscosity, solids, and recommended thickness can differ.
Should seal coats be calculated separately?
Yes. Separate calculations improve accuracy for porous surfaces.
Does a 2:1 ratio mean two total parts?
No. It means two resin parts and one hardener part.
Are weight ratios equal to volume ratios?
Not always. Different component densities change equivalent proportions.
How do embedded objects affect volume?
They displace epoxy and reduce the required mixed amount.
Why does rough concrete require more epoxy?
Surface texture creates valleys and increases actual coated area.
Can one thick pour replace several layers?
Only when the product permits that exact pour depth.
How accurate is the cost estimate?
Accuracy depends on entered prices, taxes, shipping, and extras.
What density should I enter?
Use the mixed density printed within product technical information.
Why does the calculator round kits upward?
Suppliers usually sell complete kits, not exact calculated amounts.
Important Disclaimer
This calculator provides planning estimates only.
Actual coverage can vary between products and surfaces.
Always follow current technical and safety instructions.