Multi-Wick Candle Spacing Calculator

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:

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):

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.