Fill Line
Tool i · Pour calculator

How much wax and oil to melt.

Weigh one vessel filled with water to your fill line, or use a fill weight you already know. Get the wax and fragrance oil for one candle and for the whole batch.

I.The vessel
Units
What do you know?
Put the empty vessel on the scale, zero it, fill with water to where the wax will stop, and read the weight.
oz
Wax is lighter than water. 0.86 is the usual starting figure; weigh one finished test candle to get yours.
II.The fragrance
%
Check your wax’s maximum and your oil’s IFRA certificate. This only does the maths.
Load is a % of
Most wax makers mean wax weight (8% = 8 g oil per 100 g wax).
III.The batch
%
Wax left in the pot and for top-ups. Use 0 to weigh exactly.

Your pour

Wax to melt
—
Fragrance oil
—
for 12 vessels, with 5% extra
  • Per vessel
  • Fill weight (wax + oil)
  • Wax
  • Fragrance oil
  • Oil as % of wax · of whole candle
  • Whole batch
  • Exact, no extra
  • Total blend to pour
Cost this candle

Add the oil once the wax has cooled to your wax maker’s fragrance temperature, and stir for two minutes.

Wax + oil—See all ↓

How it works

fill = water weight × wax factor
wax = fill ÷ (1 + load)
oil = wax × load

If your supplier states load as a % of the whole candle, oil = fill × load and wax = fill − oil.

Worked example

A 9 oz amber jar holds 8.4 oz of water to the fill line. 8.4 × 0.86 = 7.22 oz of candle. At 8% of the wax: 7.22 ÷ 1.08 = 6.69 oz wax and 0.54 oz oil.

For 12 jars with 5% extra: 84.28 oz wax (5.27 lb) and 6.74 oz oil.

Why not just use the jar size?

An “8 oz” jar is named for the liquid it holds, and wax is lighter than water, so most 8 oz jars take about 6.5 to 7.5 oz of wax by weight. Price and label by the weight you actually pour.