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Candle Wick Size Calculator | Soy, Beeswax & Paraffin Wick Guide
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Candle Wick Size Estimator & Guide

The Candle Wick Size Estimator helps you find the perfect starting point for your candle project. Selecting the correct wick prevents tunneling, mushrooming, and poor scent throw. Select your wax type and container diameter below to get an instant recommendation.

Wick Size Estimator

Find the perfect starting wick for a full melt pool.
Recommended Starting Wick
CD 8
Alt: ECO 4
Testing Tip: Always test burn! If the melt pool doesn't reach the glass after 2 hours, size up. If it smokes or the flame dances wildly, size down.
What do these letters mean?
"CD", "ECO", and "LX" are standard brand names for pre-made wicks. You won't find them at craft stores. Search for the exact name (e.g. "Buy CD 12 wick") on any candle supply website.

How to Choose the Right Candle Wick

Finding the right wick is the single most critical part of candle making. A wick that is too small causes "tunneling" (wasted wax left on the sides of the jar), while a wick that is too large causes dangerous soot, black smoke, mushrooming, and a glass jar that gets too hot to touch.

Best Wicks for Soy, Paraffin & Beeswax

Wicks are not one-size-fits-all. Different waxes require entirely different braid styles and materials to burn correctly:

Soy & Coconut (CD / ECO)

Vegetable waxes are thick and highly viscous. They require a flat, braided Cotton Wick (often reinforced with paper threads like the CD or ECO series) to burn hot enough to melt the natural wax.

Paraffin (LX / Zinc)

Paraffin melts incredibly easily. It requires a rigid wick (often featuring a Zinc Core) that burns with a controlled, cooler flame to prevent the candle from burning down too quickly.

Beeswax (Square Braid)

Beeswax is a hard, sticky, high-melt-point wax. It demands a robust Square Braid cotton wick that is physically thick enough to pull the heavy fuel up into the flame without drowning.

Wooden Wicks

Loved for their crackling sound. Sold by physical dimensions (e.g., .020 thick x 0.5" wide). Soft waxes use standard .020 thickness, while hard waxes require thicker .030 or .040 wood to stay lit.

When to Double Wick a Candle

If your jar is wider than 3.5 inches (9 cm), a single wick will almost always struggle to melt the wax all the way to the edge without creating a flame that is dangerously large and sooty. In these cases, Double Wicking is the professional solution.

Placement Tip

Imagine a line dividing your jar perfectly in half. Place your two wicks on that line, exactly halfway between the center point and the edge of the glass.

The "Melt Pool" Test

Regardless of what any calculator tells you, you must perform a burn test. A properly wicked candle should achieve a full melt pool (liquid wax reaching all edges of the jar) within 2 to 3 hours of lighting it.

Wick Down (Too Hot)

If the flame flickers aggressively, produces black smoke (soot), creates a large carbon "mushroom" on the tip, or the melt pool is deeper than 1/2 inch, your wick is too big. Size down.

Wick Up (Too Cool)

If the flame is tiny and struggling to survive, or if the wax "tunnels" straight down the center leaving a thick wall of hard wax on the glass after 4 hours, your wick is too small. Size up.

Frequently Asked Questions

Always measure the inside diameter of the jar opening, not the outside edge. If the glass is particularly thick, using the outer diameter will result in calculating a wick that is too large, causing the glass to overheat and potentially crack.

Soy wax is dense and viscous, requiring a flat braided wick like the CD Series or ECO Series. These wicks often have paper threads woven into them to provide the rigidity and extra heat needed to melt natural vegetable waxes evenly.
Yes! Wooden wicks perform beautifully in natural waxes. For softer waxes like Soy or Coconut, use a standard .020 thickness wood. If you are using a hard, high-melt-point wax like Beeswax, you will need to upgrade to a thicker .030 or .040 thickness wick so the flame doesn't drown.
If your wick is too small (under-wicked), it causes "tunneling." The flame will burn straight down the center, leaving a thick wall of wasted, unmelted wax stuck to the sides of the jar. Eventually, the melting wax will pool over the small flame and drown it out entirely.
If your wick is too large (over-wicked), the flame will be wildly tall, flicker constantly, and produce black soot. A carbon ball (mushroom) will form on the tip of the wick. Most dangerously, the glass jar can become too hot to touch and may shatter.
You should double wick any container with an inside diameter larger than 3.6 inches (9 cm). A single wick rarely generates enough heat to achieve a full melt pool across a surface that wide without becoming dangerously huge and sooty.