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Candle making calculator

Wax is measured by weight but containers are sold by volume, and the wax density bridges the two.

%
g/mL
%
Wax needed
2236g
= Exact Candle wax
Fragrance oil
194.4
Total fill weight
2430
Fill weight per candle
202.5
Wax per candle
186.3
Rough burn time per candle At about 7 g of wax consumed per hour for a typical container candle.
28.9 hours
Wick sizing diameter Match the wick to the container diameter and the wax; test-burn before selling.
70
Show the working
  1. Container volume = 250
  2. Number of candles = 12
  3. Fill level = 90
  4. Wax density = 0.9
  5. Fragrance load = 8
  6. Container diameter = 70
  7. fill_volume = 250 * 90/100 = 225
  8. Total fill weight = 225 * 0.9 * 12 = 2430
  9. Fragrance oil = 2430 * 8/100 = 194.4
  10. Wax needed = 2430 - 194.4 = 2235.6
  11. Fill weight per candle = 2430 / 12 = 202.5
  12. Wax per candle = 2235.6 / 12 = 186.3
  13. Rough burn time per candle = 202.5 / 7 = 28.9286
  14. Wick sizing diameter = 70 = 70

Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.

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    The formula

    • fill weight = container volume x fill level x wax density
    • fragrance = fill weight x load; wax = fill weight - fragrance

    Soy wax is about 0.9 g/mL, paraffin about 0.9, and beeswax closer to 0.96. Weigh a test pour to calibrate.

    Fragrance load above the wax flashpoint rating causes sooting and can be a fire risk. Stay within the manufacturer limit.

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