How much wax and fragrance oil does your jar need?

How this calculator works

Jars are sold by volume, but wax and fragrance oil are measured by weight. The calculator bridges the two in three steps.

1. Water weight. Water is the reference: 1 ml of water weighs 1 g, and 1 fluid ounce weighs about 1.04 oz.
2. Pour weight. Melted wax is lighter than water, so the jar holds less wax by weight. Pour weight = water weight × wax factor (0.86 by default).
3. Wax and oil split. The pour weight is split into wax and fragrance oil, so the candle still reaches your fill line once the oil is stirred in.

Wax = pour weight ÷ (1 + fragrance load)
Fragrance oil = wax × fragrance load

With the default 7.5 oz of water, soy wax and an 8% load: 7.5 × 0.86 = 6.45 oz total pour, made of 5.97 oz wax and 0.48 oz fragrance oil.

The figures are starting points. Burn-test every new wax, wick and fragrance combination before you sell or gift a candle. For more detail, read how much wax a candle jar needs and how much fragrance oil to add.