How Many Wicks Does Your Candle Need (and How Far Apart to Space Them)

A question we get a lot is how many wicks a candle actually needs, and when you go to two, how far apart they should sit. Here is the short version: most candles up to about 3 inches wide burn great on a single wick, but once your vessel gets past roughly 3 to 3.5 inches across, one wick usually cannot reach all the way to the edge, and that is when a second wick earns its place. The simplest starting rule for two wicks is to divide the inside width of the jar into thirds and set a wick at each of the two inner marks, which in a typical wide tumbler lands around 1.25 to 1.5 inches apart.

Now the why, because wick spacing quietly decides whether your candle burns beautifully or tunnels and soots. When Chad and I were figuring this out at our kitchen table in Holland, Michigan during the pandemic, we wasted a lot of wax learning it the slow way. If you are still early in learning how to start a candle business, I would rather you learn it here than from a bin of rejected candles.

When one wick stops being enough

A single wick can only melt wax out to a certain radius before the flame gets too tall and starts misbehaving. Push one wick to heat a jar that is too wide and you get one of two problems: either the flame stays small and leaves a thick ring of hard wax around the edge, which is tunneling, or you size up to a huge wick to force a full melt pool and now you have a towering flame, black soot on the glass, and a jar too hot to touch. Neither is a product you want to ship.

The fix for a wide vessel is not a bigger single wick. It is more flames, each doing a smaller, calmer job. Two medium wicks spread across a wide jar create two overlapping melt pools that together reach the edges without any single flame working too hard. As a rough guide, we reach for double wicking once the inside diameter passes about 3 to 3.5 inches, and triple wicking once it gets past roughly 4.5 inches. These are starting points, not laws, since wax, fragrance load, and vessel shape all nudge the numbers.

How to space a double wick

Here is the method we still use. Measure the inside diameter of your vessel in inches, not the outside, because the glass thickness lies to you. Picture a straight line across the center of the jar, divide it into three equal parts, and place one wick at each division. That puts each wick about a third of the way in from its own side, with the two flames sharing the middle.

Why thirds and not halves? Each wick needs to heat its own outer edge and still meet its partner in the center. Shove the two wicks too close and they act like one oversized flame in the middle: the center overheats, the glass soots up, and the outer edges stay cold and tunnel anyway. Spread them too far and you get a cold stripe down the center where neither melt pool reaches. The thirds rule keeps each flame centered in its own territory so the two melt pools just kiss in the middle and still reach the walls.

In real numbers, a 3.5 inch jar usually lands the wicks around 1.15 to 1.25 inches apart, and a 4 inch jar around 1.3 to 1.5 inches apart. So if you set a wide tumbler at about 1.25 inches apart, you are in the reasonable range. Always confirm it with a burn test rather than trusting the ruler alone.

The tip most new makers miss: wick down

This is the part that saves you. When you move from one wick to two, do not use two of the wick size you would have used for a single wick. Two flames throw a lot more combined heat into the same jar, so each wick should be a size or two smaller than your single wick instinct. A classic failure is grabbing two wicks each sized for the full jar and ending up with a roaring inferno and a cracked vessel. Start smaller than feels right, then size up only if your test burns leave cold edges.

Fragrance plays into this too. A heavier fragrance load changes how the wax melts and can push you toward a slightly larger wick to keep a clean burn. Our candle math guide walks through the numbers, and remember fragrance oil percentage is always figured on the total candle weight, not on the wax alone. Our free candle business calculators will do that math for you.

Test it before you trust it

Spacing and wick size are a starting recipe, not a finished one. Pour a couple of test candles with the same wax, fragrance, and vessel, changing only the wick size or the spacing, and label the bottoms so you never lose track. Let them cure fully, usually one to two weeks for most soy blends, then burn them three to four hours at a time and watch the melt pool, the flame height, and the glass. You want each flame around a half inch to an inch tall, a melt pool that reaches the edges within a few hours, little to no soot, and a jar that stays safe to handle. Our full wick field guide and burn testing walkthrough covers that process, and if your tests turn up tunneling or soot, our candle troubleshooting guide helps you read what the candle is telling you.

A few quick follow-up questions

Can I just use one big wick instead of two?

You can try, but in a wide jar it rarely burns as cleanly. One large wick tends to mushroom, soot, and overheat the center while still leaving the far edges cold. Two smaller flames spread the heat across the surface and almost always give a wider, cleaner melt pool in a vessel over about 3 inches.

At what width do I need three wicks?

Once the inside diameter gets past roughly 4.5 inches, two wicks usually start to struggle at the edges. For a triple wick, arrange the three in a triangle or an evenly spaced row so each flame owns its own zone, and wick each one down even further since you now have three heat sources in one jar. Test exactly like you would a double.

Do wooden wicks space the same way?

The spacing logic is similar, but wooden wicks behave differently and are sized by width rather than by the same series charts. If you are going that route, start with our wooden wick guide so you get the thickness right before you worry about placement.

Double wicking feels intimidating the first time, but once you watch two little flames open up a wide, even melt pool across a jar a single wick could never handle, it clicks. Take your time, wick down, and test. I share a lot of this on our YouTube channel, and you can ask questions alongside thousands of other makers in our free Facebook community. You can also see the candles these methods produce over at Garsnett Beacon. Go pour a couple of test jars. Future you will thank you.