Resin Volume to Weight Planning
Resin work often starts with a measured space. A mold may show milliliters, liters, gallons, or cubic inches. Buying resin by weight can then feel confusing. This calculator closes that gap. It turns the chosen volume into a practical mass using density. It also adds waste and optional additive loading.
Why Density Matters
Every resin has its own density. Epoxy is often near 1.10 grams per milliliter. Polyester can be heavier. Polyurethane may be slightly lighter. The exact value should come from the product data sheet. A small density change can affect large pours. That is why the custom density field is useful.
Better Kit Estimates
Many resin systems use two parts. They may mix as 1 to 1, 2 to 1, or 100 to 45 by weight. The tool splits the required material into Part A and Part B. This helps when weighing cups separately. It also reduces guessing during batch preparation.
Waste Allowance
Real projects need extra material. Some resin stays in cups. Some coats soak into wood. Some liquid is lost on tools. A waste percentage protects the pour. Small projects may need a higher allowance. Large flat pours may need less waste.
Additives and Fillers
Pigments, powders, stones, and fibers can change the final mass. The additive field estimates loading by weight. This is helpful for river tables, craft molds, composite repairs, and casting blanks. Keep heavy fillers within safe limits. Follow the resin maker instructions.
Useful Workflow
Measure the mold volume first. Choose the correct unit. Select a resin type or enter a custom density. Add the mix ratio from the label. Include waste based on the job. Review grams, kilograms, ounces, and pounds before mixing.
Final Notes
Use a digital scale for accurate batches. Keep containers clean. Mix slowly and fully. Scrape cup sides. Work within pot life. Temperature, filler load, and humidity can change handling. Always make a small test when a new resin, pigment, or mold is used.
Keep Records
Record each mix, batch size, density, temperature, and cure result. Good notes improve repeat orders. They also help compare brands, colors, additives, and mold styles well.