Choosing the Right Candle Wick

How to Choose the Right Candle Wick

Choosing the right wick is one of the most important parts of candle making. The wick controls how fuel is drawn into the flame and influences how your candle burns.

Wick selection depends on the complete candle formulation, including the wax, fragrance oil, fragrance concentration and container. A wick that works well in one candle may not perform the same way in another.

1. Start with Your Container Diameter

For container candles, the internal diameter of the vessel is a useful starting point when choosing a wick size.

Measure the inside width of your container, rather than relying only on its advertised capacity.

For containers with an unusual shape or varying width, consider how the candle's dimensions change as it burns.

Use this measurement alongside the wick manufacturer's sizing recommendations to identify potential wick sizes for testing.

2. Understand Wick Series

Candle wicks are available in different series, each designed with particular construction and performance characteristics.

Examples include cotton based, paper reinforced and wooden wick designs.

Different wick series can behave differently even when their recommended container sizes appear similar.

Select a wick series suitable for your wax formulation and intended candle application, using the supplier's product guidance.

3. Understand Wick Sizes

Within a wick series, different sizes are intended to support different burning requirements.

A larger wick is not automatically better, and a smaller wick is not automatically safer.

An oversized wick may produce excessive flame height, soot or container heating. An undersized wick may struggle to maintain an appropriate melt pool or may extinguish during burning.

Wick size labels are specific to their series and should not be treated as interchangeable between manufacturers or product ranges.

4. Consider Your Wax Type

Wax formulation has a significant influence on wick performance.

Soy, paraffin, coconut based and blended waxes can behave differently when used with the same wick.

Even two waxes marketed under the same general category may require different wick sizes or series.

Check whether the wick supplier recommends particular series for your chosen wax and use those recommendations as a starting point.

5. Consider Fragrance Oil and Fragrance Load

Adding fragrance oil can change the way a candle burns.

Different fragrance oils may affect wick performance differently, even when used at the same concentration.

Increasing the fragrance load does not necessarily improve fragrance performance and may require additional testing.

When selecting a wick, test with the actual fragrance oil and concentration you intend to use in the finished candle.

6. Use Wick Sizing Charts Correctly

Wick sizing charts are useful tools for narrowing down your initial options.

They commonly provide suggested wick sizes based on container diameter, wax type or other product characteristics.

However, these charts cannot account for every possible candle formulation.

Treat a sizing chart as a starting recommendation rather than a final answer. Consider testing the suggested size alongside adjacent sizes within the same wick series.

7. Prepare Consistent Test Candles

To compare wick performance accurately, prepare test candles using consistent ingredients and methods.

Keep the following variables the same wherever possible:

• Container type and internal diameter.

• Wax formulation and batch.

• Fragrance oil and concentration.

• Wax fill weight.

• Wick positioning.

• Processing and curing conditions.

Change only the wick size when comparing sizes within a series.

Follow the relevant supplier guidance for preparation and curing before testing.

8. Evaluate Candle Burn Performance

A proper burn test should assess the candle across its usable life, not just during the first lighting.

Observe and document:

• Flame behaviour: Look for excessive flame height, instability or repeated extinguishing.

• Melt pool development: Check how the wax melts as the candle burns over successive sessions.

• Soot and smoke: Watch for persistent visible soot or smoking during normal burning.

• Wick condition: Note excessive carbon build up, curling or other unusual behaviour.

• Container temperature: Assess whether the vessel becomes excessively hot.

• End of life performance: Evaluate the candle as the remaining wax level decreases.

Follow an appropriate burn testing procedure and applicable candle safety requirements. Stop testing if unsafe behaviour occurs.

9. Recognise Signs of an Incorrect Wick

An unsuitable wick may cause visible performance problems.

Possible signs of an oversized wick include excessive flame height, heavy sooting, rapid wax consumption or excessive container heating.

Possible signs of an undersized wick include a persistently weak flame, repeated self extinguishing or significant wax remaining around the sides of the container.

These symptoms are not always caused by wick size alone. Wax, fragrance, container design and testing conditions may also contribute.

10. Understand Single and Multiple Wick Designs

Some wide containers may be designed to use more than one wick.

However, adding extra wicks changes the heat distribution and burning behaviour of the candle.

Do not assume that a wide vessel requires multiple wicks or that two smaller wicks will perform like one larger wick.

Use appropriate vessel and wick guidance, and thoroughly test any multi wick design.

Common Wick Selection Mistakes

Common mistakes include:

• Choosing a wick based only on container volume.

• Assuming wick sizes are equivalent across different series.

• Testing with unscented wax when the final candle will contain fragrance.

• Changing several formulation variables at the same time.

• Judging performance from a single short burn.

• Ignoring excessive flame height, soot or container heating.

• Using an untested wick combination for finished products.

A consistent testing process helps identify problems before a candle is used or supplied to others.

Which Candle Wick Should a Beginner Choose?

For your first container candle, begin with a wick series recommended for your selected wax.

Measure the container's internal diameter and consult the supplier's sizing chart to identify an initial wick size.

Prepare small test batches using the exact wax, fragrance and container you intend to use.

Compare suitable wick sizes and record the results before selecting a final formulation.

Before Finalising Your Wick Choice

A wick should only be considered suitable after the complete candle formulation has been appropriately tested.

Follow wick and wax supplier instructions, use candle safe containers and observe applicable candle safety standards.

If you change the wax, fragrance, fragrance concentration or container, review whether additional wick testing is necessary.