Wax Melt Calculator

Most wax melts perform best with a fragrance load of 6–10% of the wax weight. Para-soy blends typically hold 8–10%, while pure soy wax maxes out around 6–8%. Coconut wax can handle up to 12%. Using too much fragrance oil can cause sweating, poor scent throw, or even a fire hazard. Always check your wax manufacturer's maximum fragrance load.

Multiply the wax capacity per cavity by the number of cavities you plan to fill. For example, if each cavity holds 15g and you're making 6 melts, you need 90g of pure wax. Then add your fragrance oil (e.g., 8% × 90g = 7.2g) and dye. Our calculator above does this instantly—just enter your numbers and get precise measurements.

Dye usage typically ranges from 0.5% to 2% of the wax weight, depending on desired color intensity:

• Pastel / Light: 0.3–0.5%
• Medium / Standard: 0.8–1.2%
• Deep / Bold: 1.5–2.5%

Liquid dyes are often measured in drops (roughly 3–6 drops per 100g of wax), while dye blocks are shaved and weighed. Always test small batches first to dial in your preferred shade.

The best wax depends on your priorities:

• Para-soy blends: Most popular—excellent scent throw, smooth finish, good mold release.
• Soy wax: Natural, clean-burning, but lower fragrance capacity (6–8%).
• Paraffin wax: Highest fragrance load (up to 10–12%), strongest hot throw.
• Coconut wax: Luxurious, creamy, holds up to 12% fragrance.
• Beeswax: Natural honey scent, limited fragrance absorption (3–6%).

For beginners, a para-soy blend is the most forgiving and widely available option.

Weak scent throw is usually caused by:

• Too little fragrance oil: Ensure you're using at least 6% of wax weight.
• Adding fragrance at the wrong temperature: Most waxes require adding fragrance oil at 175–185°F (79–85°C).
• Low-quality fragrance oils: Use reputable suppliers with proven hot throw performance.
• Candle fragrances in wax melts: Some fragrances formulated for candles don't perform well in wax melts at lower warmer temperatures.
• Curing time: Wax melts benefit from 3–7 days of curing for optimal scent.

Yes, but with caveats. Essential oils generally have a weaker hot throw than synthetic fragrance oils and may require higher percentages (8–12%). Some essential oils can also cause wax to seize or sweat. Citrus oils are particularly volatile and may evaporate quickly. For best results, use essential oils specifically blended for candle and wax melt making, and test small batches first.

The industry standard is to calculate fragrance oil percentage based on the wax weight alone, not the total mixture weight. For example, 8% fragrance load means 8g of fragrance oil per 100g of wax, resulting in 108g total. This calculator follows that standard. Some artisans use total-weight calculations, which yields slightly less fragrance—be consistent with whichever method you choose.