Start Submit a site

Candle Wax Calculator

Craft & DIY

Work out exactly how much wax and fragrance oil a jar, tin or mold needs — in grams and ounces.

Your inputs

Browse all tools

cm

Fill to about 1 cm below the rim so the wax can shrink safely.

g/cm³

Soy wax is usually 0.86–0.90 g/cm³; paraffin is close to 0.90.

%

Most candle waxes hold 6–10%. Do not exceed the supplier maximum.

%

Wax left in the pitcher or lost to evaporation. 3–5% is typical.

Result

Wax needed — g
  • Fragrance oil — g
  • Total mixture — g
  • Wax per candle — g
  • Total in ounces — oz

Change any input and the result updates instantly.

Formula and rules

  • Cylinder volume = π × (diameter ÷ 2)² × fill height
  • Rectangular volume = length × width × fill height
  • Wax weight = volume × wax density × batch size × (1 + melt loss)
  • Fragrance weight = wax weight × fragrance load %
  • Ounces = grams ÷ 28.35

Worked examples

Single 8 cm jar

Input Diameter 8 cm, fill height 8 cm, 1 candle, soy wax 0.86 g/cm³, 8% fragrance, 5% melt loss.

Result ≈ 363 g wax + 29 g fragrance = 392 g (13.8 oz) of melted wax.

Two 7 × 8 cm pillars

Input Diameter 7 cm, fill height 8 cm, 2 candles, 8% fragrance, 5% melt loss.

Result ≈ 556 g wax + 44 g fragrance = 601 g (21.2 oz).

10 × 10 × 8 cm block mold

Input Rectangular mold, 10 cm × 10 cm, fill height 8 cm, 8% fragrance, 5% melt loss.

Result ≈ 722 g wax + 58 g fragrance = 780 g (27.5 oz).

FAQ

Should fragrance be a percentage of the wax or of the finished candle?

Fragrance load is always calculated on the wax weight. A 500 g batch at 8% takes 40 g of fragrance oil, giving 540 g of pour weight.

Why does the calculator add a melt-loss allowance?

Some wax stays in the melting pitcher and a little evaporates. Without a 3–5% buffer the last jar in a batch often comes up short.

Can I use this for wax melts?

Yes. Choose the rectangular shape and enter the cavity dimensions as length, width and depth. Use the same fragrance percentage you would for a candle.

Related calculators

Yarn Yardage Calculator Turn a finished weight into yards, or a pattern’s yardage into skeins — with a waste allowance and cost estimate. Tile Grout Calculator Calculate grout in kilograms from tile size, joint width, tile thickness and the area you are tiling. Paint Coverage Calculator Estimate litres or gallons of paint from wall area, ceilings, openings, coats and the coverage printed on the tin. JSON to YAML Converter Paste JSON and get clean YAML instantly — pick 2 or 4 space indent, keep the original key order or sort keys, all inside your browser. Image Compressor Shrink JPG, PNG and WebP photos in your browser — pick a quality level and a max size, then download the smaller file. Nothing is uploaded. Roof Pitch Calculator Convert rise and run into x:12 pitch, degrees, slope percentage, rafter length and the roof slope factor.

More in this category: Yarn Yardage Calculator

Disclaimer: Results follow the formula shown on this page and are for reference only. Real-world quantities vary with materials, technique and conditions, so allow a margin before ordering.