Candle Wick Size Calculator & Sizing Chart (Prevent Tunneling)
Find the exact wick size for your candle jar diameter and wax type. Prevents tunneling, mushrooming, and jar cracking with single and double-wick recommendations. Adjust the parameters in the interactive workbench below to get immediate recipe card outputs.
Measure the interior width at the widest point where the wax pool forms.
Standard supplier charts assume 6% FO. Loads of 8%-10% require wicking up 1 size.
Recommended Wick Configuration
Single Wick SetupNatural crackling wood wick. Thickness and width optimized for wax density.
Burn Pool & Flame Diagnostics
Rule: 1 hour of burn per 1 inch of diameter
Wick charts provide the scientific starting baseline. Always pour 3 test candles: the recommended size, 1 size up, and 1 size down. Perform a 4-hour burn test to verify melt pool reach and flame stability.
Where to Buy This Batch
Verified factory distributors for calculated material volume
Formulation matched to AAK Golden Wax 464 & CD/ECO Wicks. Sourced directly from verified manufacturers and certified stockists:
Major US distributor for natural soy waxes, continuous thread amber jars, Heinz Verhaegh CD wicks, and manufacturer Safety Data Sheets (SDS).
Direct supplier for boutique candle makers, cold-process soap crafters, and silicone mold casting. Supplies IFRA-compliant fragrance oils and wax bases.
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To calculate the exact volume and weight splits for this craft project, the workbench executes the following geometric equations:
Master Candle Wick Sizing Matrix by Container Diameter & Wax Chemistry
ASTM F2058 / F2417 Safety StandardsEmpirical wick series recommendations across jar diameters and natural wax formulations for single and double wicking.
| Container Diameter | Golden Wax 464 (Soy) | NatureWax C-3 | IGI 6006 (Parasoy) | 100% Beeswax | Makesy Wooden Wick |
|---|---|---|---|---|---|
| 2.0" (51mm) | CD 4 / ECO 4 / HTP 52 | CD 6 / ECO 4 | CD 4–6 / ECO 4 | CD 8 / ECO 6 | .03 x .375" |
| 2.5" (64mm) | CD 6–8 / ECO 6 / HTP 73 | CD 8–10 / ECO 6–8 | CD 6–8 / ECO 6 | CD 12–14 / ECO 10 | .03 x .375" |
| 3.0" (76mm) | CD 10–12 / ECO 8–10 / HTP 83–104 | CD 12–14 / ECO 10 | CD 10–12 / ECO 8 | CD 16–18 / ECO 12–14 | .03 x .500" |
| 3.5" (89mm) | Single: CD 14–16 | Double: 2x CD 4 | Single: CD 18 | Double: 2x CD 6 | Single: CD 14 | Double: 2x CD 4 | Single: CD 22 | Double: 2x CD 8 | 2x .04 x .375" |
| 4.0" (102mm) | Double Mandatory: 2x CD 6 / 2x ECO 6 | Double: 2x CD 8 / 2x ECO 6 | Double: 2x CD 6 / 2x HTP 73 | Double: 2x CD 10 / 2x HTP 83 | 2x .04 x .500" |
In-Depth Crafting Guide & Density Analysis
Selecting the correct candle wick size is the single most critical engineering factor in candle making. Using the wrong wick causes immediate product failure: an undersized wick creates tunneling that wastes 40% of the wax, while an oversized wick causes mushrooming, black smoke, and dangerously hot glass that can crack.
This candle wick size selector matches your vessel's inside diameter, wax chemistry (Golden Wax 464, C-3, 444, IGI 4630/6006, Beeswax), and fragrance load percentage against manufacturer wick matrices (CandleScience ECO, Heinz Verhaegh CD, Atkins & Pearce HTP, Premier 700, and Makesy Wooden Wicks). It incorporates the ASTM Half-Diameter double-wicking rule for containers 3.5" and wider.
Frequently Asked Questions (Candle Wick Size Calculator)
How do I choose the correct wick size for my candle?
Measure the exact inside diameter of your container where the melt pool forms. Natural vegetable waxes (Soy, Coconut, Beeswax) have higher melting points and viscosity, requiring hotter, larger wicks (e.g., CD or ECO series) compared to paraffin waxes of identical diameter. Always conduct a 4-hour test burn to verify that a full melt pool (1/4" to 1/2" deep) reaches the container edges within 2 to 4 hours.
What causes candle tunneling and how do you prevent it?
Tunneling occurs when a wick's heat output is insufficient to melt wax across the entire surface diameter, leaving a solid ring of unmelted wax along the walls. Prevent tunneling by sizing up the wick according to vessel diameter and maintaining 1 hour of burn time per 1 inch of diameter on the first burn.
Why is my candle wick mushrooming and smoking?
Mushrooming is the accumulation of unburned carbon deposits at the wick tip, causing an oversized flame, flickering, and soot. It indicates an over-wicked candle, an excessive fragrance oil load (>10%), or an untrimmed wick. Size down by 1 to 2 wick sizes, reduce fragrance load to 6%–8%, and ensure the wick is trimmed to 1/4 inch (5mm) before each burn.
At what diameter should you double-wick a candle?
Containers with an inside diameter of 3.0 inches (76 mm) or larger are prime candidates for double-wicking, and double-wicking is mandatory for containers 3.5 inches (89 mm) and wider. Using a single giant wick in vessels over 3.25" produces an overly deep, dangerous center melt pool while overheating the glass. Apply the Half-Diameter Rule: use two wicks each sized for half the diameter.
Why does Golden Wax 464 need a larger wick than paraffin wax?
Golden Wax 464 is a dense, high-viscosity vegetable wax that requires more thermal energy to liquefy and travel up the wick capillaries. Paraffin wax has a crystalline structure with lower viscosity, allowing smaller wicks to burn cleanly without extinguishing.
How does adding 10% fragrance oil affect the wick size needed?
Fragrance oils increase fuel viscosity and can clog wick capillaries. When using 8% to 10% fragrance oil, makers must 'wick up' by exactly one size (e.g., from CD 10 to CD 12) to maintain proper fuel draw and prevent flame drowning.
Workshop Companion Guides & Technical Analysis
Deepen your understanding of material chemistry, failure modes, and troubleshooting with these peer-reviewed workshop guides:
Soy Candle Wick Size Chart (Golden Wax 464, CD & ECO Guide)
Why Candle Tops Sink, Crack & Frost: Prevention & Troubleshooting
Candle Fragrance Oil Load Percentage Guide (Safe 6%-10% Limits)
Soy vs Paraffin vs Beeswax: Complete Wax Properties
Other Calculators in the CANDLE Suite
Explore other specialized volume, density, and cost estimators built for makers: