Multi-Wick Candle Spacing Calculator
Calculate optimal spacing for 2, 3, or 4-wick candles by container diameter and wick size.
Get spacing in inches and centimeters with melt-pool overlap targets.
Multi-Wick Candle Spacing
Larger-diameter candles need multiple wicks because a single wick can only burn a melt pool of about 3-4 inches diameter. Multiple wicks distribute heat evenly and prevent tunneling.
Wick count by container diameter:
| Container Diameter | Wicks |
|---|---|
| Under 3 inches | 1 wick |
| 3-4 inches | 1 wick (large) or 2 (small) |
| 4-5 inches | 2 wicks |
| 5-7 inches | 2-3 wicks |
| 7-9 inches | 3-4 wicks |
| 9-12 inches | 4-6 wicks |
| Over 12 inches | 6+ wicks (with safety considerations) |
Spacing formula: Spacing between wicks = (Container diameter - 1") / (Wicks per row - 0.5) for symmetric placement
For 2 wicks in a 5" jar: ~2.5" apart, both 1.25" from center toward edges.
Melt pool overlap target: Each wick should produce a melt pool that slightly overlaps the neighbor pool. Aim for 20-30% overlap at full burn (about 3 hours into use).
Standard wick melt pool sizes (cotton flat-braid wicks):
| Wick Size | Melt Pool Diameter |
|---|---|
| ECO-1 / CD-3 | 1.5-2 in |
| ECO-4 / CD-7 | 2-2.5 in |
| ECO-8 / CD-12 | 2.5-3 in |
| ECO-12 / CD-16 | 3-3.5 in |
| ECO-14 / CD-22 | 3.5-4 in |
| LX wicks (large) | varies, similar |
Layout patterns:
2 wicks: along the long axis or diagonal of the container. 3 wicks: equilateral triangle, equidistant from center. 4 wicks: square pattern, equidistant. 6 wicks: hexagon (5 around + 1 center), or 2 rows of 3.
Safety considerations:
- Multi-wick candles burn HOTTER than single-wick — choose smaller wicks per individual flame
- Always test burn 3-4 hours to confirm melt pools overlap without overheating glass
- Container temperature should stay below 175°F (80°C) at the rim
- Wick down (use smaller wicks) if flames merge into single tall flame
Wick-down guideline (3 wicks): A 5-inch candle that’d need a CD-12 wick if single-wick → use 3× CD-7 wicks for a 3-wick pattern. Smaller wicks per flame = safer multi-wick.
Common mistakes:
- Using 3× the same large wick → too hot, melts pool too fast, can ignite container
- Wicks too close together → flames merge, dangerous
- Wicks too far apart → tunneling between them, wax wasted
- No safety test burn → discovers problems with first customer
The “stair-step” test: Burn the candle in increments to verify melt pool development:
- 2 hours: small individual pools per wick
- 4 hours: pools should be reaching toward each other
- 6 hours: pools merged across surface (full melt pool)
If pools never merge by 6 hours, wicks are too far apart or too small.
Fragrance load consideration: Multi-wick candles “throw” fragrance more strongly because of higher total surface area. Reduce fragrance oil 1-2% from single-wick formula to avoid headache-inducing scent levels.