The Most Common Wick Sizing Mistakes Candle Makers Make

Wick selection is one of the most important factors in candle performance.

It is also one of the most commonly misunderstood.

Small changes in wick size can significantly affect burn behavior, fragrance throw, and overall stability.

Mistake 1: Under-Wicking

Under-wicking occurs when the wick is too small for the vessel.

Common signs:

• Tunneling

• Weak melt pool

• Poor fragrance throw

• Flame struggling to sustain

This results in incomplete wax consumption and reduced performance.

Mistake 2: Over-Wicking

Over-wicking occurs when the wick is too large.

Common signs:

• Excessive flame height

• Overheating

• Soot or carbon buildup

• Rapid burn rate

This can lead to safety issues and inconsistent burn quality.

Mistake 3: Ignoring Vessel Size

Wick size must match vessel diameter.

Wider vessels require:

• Larger wicks

• Or multiple wick configurations

Using a wick that is too small for the diameter results in uneven burn patterns.

Mistake 4: Not Adjusting for Fragrance Load

Fragrance oil affects how a candle burns.

Higher fragrance loads can:

• Slow burn performance

• Require larger wick sizes

Ignoring this relationship leads to inconsistent results.

Mistake 5: Relying on Assumptions Instead of Testing

Many makers rely on:

• Supplier recommendations

• Previous formulas

• Trial and error without documentation

Wick selection should always be validated through structured testing.

The Right Approach

Proper wick selection requires:

• Controlled burn testing

• Multiple wick size comparisons

• Consistent evaluation conditions

There is no universal wick size.

Only tested results.