Candle Wax Calculator
Making container candles requires precise measurements of wax, fragrance oil, and optional dye to get consistent results every time. Too little wax leaves gaps in your containers; too much fragrance oil can cause seeping or a poor burn; too little can result in weak scent throw. This candle wax calculator takes the guesswork out of batch planning by computing the exact amounts you need based on the number of candles you want to make, the volume of your containers, and your chosen fragrance load percentage. The core formula converts your container volume (in fluid ounces) to wax weight using a factor of 0.85, which accounts for the lower density of wax compared to water and the slight shrinkage that occurs as wax solidifies. Fragrance oil is then calculated as a percentage of wax weight, a standard practice in the candle industry. Whether you are working with soy wax, paraffin wax, or a blend, this calculator gives you a reliable starting point for your batch. Always weigh your ingredients on a digital scale for accuracy, and conduct a test burn before producing a large batch.
For 6 candles at 8 fl oz each: you need -- oz of wax and -- oz of fragrance oil.
How the candle wax calculator works
The calculator uses three sequential steps to compute your batch requirements. All weight measurements are in ounces (oz) and all volumes in fluid ounces (fl oz).
Wax per candle (oz) = container volume (fl oz) × 0.85
Total wax (oz) = wax per candle × number of candles
Fragrance oil (oz) = total wax × (fragrance load / 100)
Dye (oz) = total wax × 0.00625 [optional; 0.1 oz per lb]
Total batch (oz) = total wax + fragrance oil [+ dye if selected]
Worked example
6 candles, 8 fl oz containers, 8% fragrance load, no dye:
- Wax per candle: 8 × 0.85 = 6.80 oz
- Total wax: 6.80 × 6 = 40.80 oz
- Fragrance oil: 40.80 × 0.08 = 3.26 oz
- Total batch weight: 40.80 + 3.26 = 44.06 oz
Fragrance load reference
| Fragrance load | Fragrance oil per oz of wax | Notes |
|---|---|---|
| 6% | 0.06 oz | Light scent; good for sensitive noses |
| 8% | 0.08 oz | Standard for soy and paraffin container candles |
| 10% | 0.10 oz | Strong scent; check oil manufacturer's maximum |
Always check your fragrance oil supplier's recommended maximum usage rate. Exceeding the maximum can cause fragrance pooling, a discoloured wax surface, or fire hazard.
Frequently asked questions
Why do I multiply container volume by 0.85 for wax weight?
Candle wax is less dense than water, so a fluid ounce of wax weighs less than a fluid ounce of water. The 0.85 factor converts fluid ounce container volume to approximate ounces of wax by weight, while also accounting for the small air gaps and shrinkage that occur as wax cools and sets. This gives a practical starting estimate; your actual pour may vary slightly by wax type and temperature.
What fragrance load percentage should I use?
Most candle makers use a fragrance load between 6% and 10% by weight of wax. Soy wax typically holds 6% to 10% fragrance oil well. Paraffin can sometimes hold slightly more. The National Candle Association recommends not exceeding the fragrance oil manufacturer's recommended usage rate, as too much fragrance oil can cause seeping, poor burn, or fire hazard. Start at 8% and adjust based on scent throw.
Do I need to add dye to my candles?
Dye is entirely optional. Many candle makers prefer natural, undyed soy candles. If you choose to add dye, a common starting rate is approximately 0.1 oz of dye per pound of wax (about 0.00625 oz per oz of wax). Liquid dyes, dye chips, and powder dyes all have different concentrations, so follow the dye manufacturer's specific guidance for their product.
What is the difference between soy and paraffin wax for candles?
Soy wax is a natural, renewable product derived from soybean oil. It burns cleaner and slower than paraffin, has a lower melting point, and tends to hold fragrance well. Paraffin wax is a petroleum by-product, burns brighter, and is often cheaper. Both are suitable for container candles. The 0.85 conversion factor used in this calculator applies to both types as a practical estimate.
How do I know how much wick to buy?
Wick sizing depends on the container diameter, wax type, and fragrance load. This calculator focuses on wax, fragrance, and dye quantities. For wick selection, refer to the wick manufacturer's guide (such as those from Candlescience or Wicks Unlimited) and always conduct a burn test before producing a full batch.
Official sources
- National Candle Association: www.candles.org (candle safety and industry standards).
- National Candle Association: Candle Safety (fragrance load and burn guidance).
Reviewed by the CalculatorHub team, edited by James Graham, 14 June 2026. See our methodology.