Candle mold wax calculator
A mold with a volume of 662.7 mL takes 596.41 g of wax and 0.00 g of fragrance oil for each candle.
Result
Wax per candle
g
Mold volume
mL
| Mold volume from its measurements | 662.68 mL |
|---|---|
| Specific gravity of the wax | 0.90 g/mL |
| Fill weight (volume times gravity) | 596.41 g |
| Wax per candle | 596.41 g |
| Fragrance oil per candle | 0.00 g |
| Wax for the batch | 596.41 g |
| Oil for the batch | 0.00 g |
| Wax and oil for the batch | 596.41 g |
How it works
The tool finds the inside volume of the mold from its measurements with the standard solid-geometry formulas: a cylinder, a tapered cylinder (a frustum, which becomes a cone when the top is zero), a block or a sphere. It then multiplies the volume by the specific gravity of the wax to get the weight, and splits off the fragrance oil if you add some. The same arithmetic covers wax melts and tarts: enter the cavity as a block or a ball and the number of pieces as the number of candles.
Formula
Mould volume V. round (straight pillar when top = bottom, tapered pillar or cone otherwise): r1 = bottom_diameter / 2, r2 = top_diameter / 2, V = pi x height / 3 x (r1^2 + r1 r2 + r2^2). rect: V = length x width x height. sphere: V = pi x diameter^3 / 6. Specific gravity: soy 900, paraffin 900, beeswax 970 kg/m3 (constants.wax_gravity_kg_m3) or the user's gravity for wax = custom. Fill weight M = V x gravity. With fragrance load p (oil relative to wax): W = M / (1 + p), O = W x p. For n candles and pot allowance e: wax_batch = n x W x (1 + e), oil_batch = n x O x (1 + e), batch_total = n x M x (1 + e).
Worked example
The calculator opens with this example; the result above is computed from it.
| Input | Value |
|---|---|
| Mold shape | Round or tapered pillar |
| Bottom diameter | 7.5 cm |
| Top diameter | 7.5 cm |
| Height | 15 cm |
| Wax | Soy wax |
| Fragrance load | 0 % |
| Number of candles | 1 pcs |
| Extra for the pot | 0 % |
| Wax per candle | 596.41 g |
| Mold volume | 662.7 mL |
Common cases
| Case | Starting values | Wax per candle | Mold volume |
|---|---|---|---|
| Straight pillar | Bottom diameter 7.5 cm; Top diameter 7.5 cm; Height 15 cm; Fragrance load 6 %; Number of candles 1 pcs; Extra for the pot 0 % | 562.65 g | 662.7 mL |
| Tapered pillars, batch of four | Bottom diameter 8 cm; Top diameter 6 cm; Height 12 cm; Fragrance load 6 %; Number of candles 4 pcs; Extra for the pot 5 % | 394.77 g | 465.0 mL |
| Cube block | Length 7 cm; Width 7 cm; Height 7 cm; Fragrance load 8 %; Number of candles 1 pcs; Extra for the pot 0 % | 285.83 g | 343.0 mL |
| Ball candles, pair | Diameter 8 cm; Fragrance load 0 %; Number of candles 2 pcs; Extra for the pot 0 % | 260.04 g | 268.1 mL |
Assumptions and limits
- Use inside measurements of the mold, at the level you pour to.
- The wick and any insert are not subtracted from the volume.
- The wax figures are typical values from the sources named on this page. Brands differ, so use your supplier's number for an exact weight.
- The pot allowance is added to both wax and oil in the batch figures.
- Wax shrinks as it cools, so a mold may need a little topping up; that wax is not counted here.
The result is an estimate for planning, not professional advice.
Sources
- Frustum (Wikipedia): V = pi h / 3 (r1^2 + r1 r2 + r2^2)retrieved 2026-10-12
- Cylinder (Wikipedia): V = pi r^2 hretrieved 2026-10-12
- Sphere (Wikipedia): V = pi d^3 / 6retrieved 2026-10-12
- Candlemaking (AU) safety data sheet, soy wax flake GW464: specific gravity 0.9retrieved 2026-10-12
Last updated:
Method in depth: Mold volume: cylinder, taper, block and ball
Cite this page: Candle Math, “Candle mold wax calculator”, https://candle-math.pages.dev/candle-wax/candle-mold-wax-calculator/ (updated 12 October 2026).
Found a mistake? Email candlemath.site@gmail.com.