Candle Wick Size Calculator
Determine the correct wick size for your candle from container diameter and wax type. Enter values for instant results with step-by-step formulas.
Formula
Effective Diameter = Container Diameter x Wax Factor x Fragrance Factor x Dye Factor x Shape Factor
The effective diameter accounts for factors that influence heat requirements. Different wax types need more or less heat to achieve a full melt pool. Higher fragrance loads require slightly larger wicks. Dye can clog wicks, requiring upsizing. The effective diameter is then matched to wick manufacturer sizing charts.
Worked Examples
Example 1: 3-inch Soy Candle in Straight Jar
Problem: Determine wick size for a 3-inch diameter, 4-inch tall straight jar with soy wax, 8% fragrance load, no dye.
Solution: Base diameter: 3.0 inches\nSoy heat factor: 1.0\nFragrance factor: 1 + (8-6) x 0.02 = 1.04\nDye factor: 1.0 (no dye)\nShape factor: 1.0 (straight)\nEffective diameter: 3.0 x 1.0 x 1.04 x 1.0 x 1.0 = 3.12 inches\n\nRecommendations: CD-10, ECO-10, HTP-104\nSingle wick | Burn time: ~16 hours\nBest series for soy: ECO or HTP
Result: Recommended: CD-10, ECO-10, or HTP-104 | Single wick | ~16 hour burn time
Example 2: 5-inch Coconut Wax Candle with Dye
Problem: Determine wick for a 5-inch wide, 3-inch tall jar candle using coconut wax, 10% fragrance, with dye.
Solution: Base diameter: 5.0 inches\nCoconut heat factor: 1.05\nFragrance factor: 1 + (10-6) x 0.02 = 1.08\nDye factor: 1.05\nShape factor: 1.02 (jar)\nEffective diameter: 5.0 x 1.05 x 1.08 x 1.05 x 1.02 = 6.09 inches\n\nDouble wick needed (>4 inches)\nEach wick sized for ~2.5-3 inch diameter\nRecommendations: CD-7/10, ECO-6/10 per wick\nBurn time: ~12 hours
Result: Double wick: CD-7 to CD-10 each | ECO-6 to ECO-10 each | ~12 hour burn time
Frequently Asked Questions
How do I choose the right wick size for my candle?
Choosing the correct wick size is the most critical decision in candle making and depends on multiple factors working together. The container diameter is the primary determinant since the wick must produce enough heat to create a full melt pool from edge to edge. A wick too small causes tunneling where only the center melts, wasting wax. A wick too large creates excessive heat, potential sooting, and unsafe flame heights. Start by matching your container diameter to the wick manufacturer's guidelines, then adjust for wax type (soy needs more heat than paraffin), fragrance load (higher loads need slightly larger wicks), and additives like dye. Always make test candles with three sizes: the recommended size, one size up, and one size down, then burn-test each for 3-4 hours to evaluate performance.
How do I know if my wick is too large or too small?
Several observable signs indicate wick sizing issues during a burn test. A wick that is too large will produce a flame taller than 1.5 inches, cause the container to become excessively hot (unsafe to touch), produce visible soot or black smoke, consume wax too quickly with a short burn time, and may cause the glass container to crack from excessive heat. A wick that is too small will produce a small, flickering flame under 0.5 inches, fail to create a full melt pool after 3-4 hours of burning, cause tunneling with a deep well forming around the wick, and may self-extinguish or drown in its own melt pool. The ideal wick produces a steady flame of 1-1.5 inches, achieves a full melt pool within 2-4 hours, shows minimal soot, and burns at approximately 4-5 hours per inch of candle height.
When should I use multiple wicks instead of one large wick?
Multiple wicks become necessary when a single wick cannot safely provide enough heat for a full melt pool. As a general rule, containers wider than 4 inches benefit from double wicks, and containers wider than 5.5 inches should use triple wicks. Using multiple smaller wicks instead of one large wick provides several advantages: more even heat distribution across the melt pool surface, reduced tunneling risk, lower individual flame heights for better safety, and more even fragrance throw. When using multiple wicks, space them evenly across the diameter and use wicks sized for half (double wick) or one-third (triple wick) of the container diameter. For example, a 5-inch container with double wicks should use wicks sized for 2.5-inch diameter candles. Test burns are especially critical with multiple wicks to ensure the combined heat is not excessive.
Can I use Candle Wick Size Calculator on a mobile device?
Yes. All calculators on NovaCalculator are fully responsive and work on smartphones, tablets, and desktops. The layout adapts automatically to your screen size.
How do I interpret the result?
Results are displayed with a label and unit to help you understand the output. Many calculators include a short explanation or classification below the result (for example, a BMI category or risk level). Refer to the worked examples section on this page for real-world context.
How do I get the most accurate result?
Enter values as precisely as possible using the correct units for each field. Check that you have selected the right unit (e.g. kilograms vs pounds, meters vs feet) before calculating. Rounding inputs early can reduce output precision.