Epoxy Resin Coating and Mixing Calculator
Calculate the exact amount of epoxy resin needed for your project. Estimate coverage volume for tables or floors, and get the precise A and B mixing ratio by weight or volume.
What is This Tool
This professional epoxy resin calculator is designed to accurately calculate the exact amount of resin and hardener needed for coating, table top, casting, and deep pour projects. Unlike basic calculators, it accounts for real-world factors like waste allowance, material density differences, and unit conversions (imperial/metric) to ensure you mix the perfect amount of epoxy every time—no more wasted material or failed cures.
Built for DIY enthusiasts, woodworkers, and professional fabricators in the US, this tool works entirely in your browser (no data sent to servers) to deliver fast, precise measurements for projects of any size—from small jewelry casts to large commercial table tops.
How to Use
Get accurate epoxy measurements in 6 simple steps:
- Select Your Project Type: Choose "Coating / Table Top" for thin surface applications (e.g., bar tops, countertops) or "Casting / Deep Pour" for thicker molds (e.g., river tables, resin art).
- Enter Exact Dimensions: Input length, width, and thickness/depth using inches, feet, centimeters, or meters—whichever you prefer for your project.
- Add Waste Allowance: Include a 5-10% buffer (standard for epoxy projects) to account for mixing loss, spills, or uneven surfaces. Adjust the percentage to match your experience level.
- Set Mix Ratio: Choose between volume (most common for DIY) or weight (professional precision) ratios. Use preset ratios (1:1, 2:1, etc.) or enter a custom ratio from your epoxy manufacturer’s instructions.
- Adjust Density (If Needed): For weight-based mixing, verify the density of your resin (Part A) and hardener (Part B) (defaults match US industry standards: 1.15 g/cm³ for resin, 1.02 g/cm³ for hardener).
- Review Results: Toggle between grams, kilograms, ounces, or pounds to get measurements in your preferred unit. The bill of materials shows exactly how much of each component to mix.
Key Features
- Dual Project Modes: Optimized calculations for thin coatings (≤1/8") and deep pours (up to several inches) to match US epoxy manufacturer guidelines.
- Unit Flexibility: Seamlessly switch between imperial (in/ft/oz/lb) and metric (cm/m/g/kg) units—critical for US users who work with both systems.
- Density-Based Calculations: Accounts for differences in resin/hardener density to prevent incorrect mixes (a common cause of epoxy not curing properly).
- Waste Allowance Calculator: Built-in buffer to avoid running short on material (5% is standard for US woodworking projects).
- Real-Time Updates: Instant recalculations as you adjust inputs—no need to click a "calculate" button.
- Preset Ratios: Quick access to the most common epoxy mix ratios used in the US (1:1, 2:1, 3:1, 4:1) from top brands like ArtResin, Pro Marine, and TotalBoat.
- Privacy-First Design: All calculations run locally in your browser—your project details never leave your device.
Common Use Cases
Perfect for all epoxy projects popular in the US:
- River Tables & Woodworking: Calculate deep pour epoxy for live-edge river tables (the #1 use case for epoxy in US woodshops).
- Countertops & Bar Tops: Thin coating calculations for food-safe epoxy applications on kitchen/bathroom surfaces.
- Resin Art & Crafts: Precise small-batch mixes for jewelry, coasters, and wall art (minimizes waste for hobbyists).
- Commercial Flooring: Large-scale calculations for epoxy garage floors or retail space coatings (supports feet/meters for big projects).
- Mold Casting: Cylinder/rectangle mold calculations for custom resin parts, tools, or industrial prototypes.
- Table Tops: Clear coat calculations for dining tables, desks, and outdoor furniture (accounts for thin, even coats).
Frequently Asked Questions
Why is there a difference between volume and weight ratios?
Most US epoxy brands list ratios by volume (e.g., 1:1 by cup), but professional fabricators use weight for precision. Resin and hardener have different densities—1 cup of resin weighs more than 1 cup of hardener—so weight-based mixing ensures the chemical reaction is perfect (critical for full curing).
What waste allowance should I use?
DIY users: 10% waste allowance (to account for spills/mixing errors). Experienced users: 5% (standard for consistent results). For large commercial projects: 3-5% (minimizes waste while accounting for surface unevenness).
Can I use inches for dimensions and ounces for output?
Yes! The tool automatically converts all units behind the scenes. You can input dimensions in inches/feet (imperial) and get output in ounces/pounds (US standard) or switch to metric for international materials.
What if my epoxy’s density is different from the defaults?
Check your epoxy manufacturer’s technical data sheet (TDS)—most US brands list density in g/cm³ or lb/gal. Update the density fields to match, and the calculator will adjust weights accordingly for perfect mixing.
Does this work for deep pour epoxy (2+ inches)?
Absolutely! The "Casting / Deep Pour" mode is optimized for thick pours (common in US river table projects). It accounts for slower curing deep pour epoxy and calculates volume/density correctly for large molds.
Why do my calculations sometimes show more material than expected?
Epoxy expands slightly when mixed, but the main reason is waste allowance (added before ratio calculations) and density differences. Always follow the calculator’s output—undermixing epoxy leads to soft, tacky cures (a costly mistake for US woodworkers).
Advanced Tips for US Users
Pro tips to get professional results with US-made epoxy:
- Calibrate Your Scales: For weight-based mixing, use a food/shop scale calibrated in ounces/pounds (US standard) and tare the mixing cup first to eliminate container weight.
- Account for Temperature: US garage/workshop temperatures (below 70°F or above 85°F) affect epoxy viscosity—mix 10% more if working in cold conditions (slower pour = more waste).
- Subtract Embedded Objects: For river tables, subtract the volume of wood/stone from your mold dimensions to avoid overmixing epoxy (critical for expensive deep pour resin).
- Use US Standard Mixing Cups: If using volume ratios, use 16oz/32oz mixing cups (common in US hardware stores) with marked measurements to match the calculator’s volume outputs.
- Layer Thin Pours: For deep pours (>1 inch), split the calculator’s total into 1/2 inch layers (US best practice) to prevent exothermic cracking.
- Store Epoxy Properly: Keep resin/hardener at 70-75°F (US room temperature) before mixing—cold epoxy is thicker and harder to measure accurately.