The short versionCold throw sells the candle and hot throw is the one you live with. Buy for room volume, not for how strong the jar smells on the shelf.
Scent throw is the only performance metric that matters in a candle and almost nobody publishes a number for it. Brands say strong or subtle. We measure feet.
Cold throw versus hot throw
Cold throw is what you smell with the candle unlit and the lid off. It comes from fragrance oil evaporating off the top surface of the wax at room temperature. It is the thing that sells a candle in a shop, and it is a poor predictor of what happens next.
Hot throw is scent released from the melt pool once the candle is burning. The melt pool is much larger than the cold surface and much warmer, so hot throw is typically several times stronger and it is the only number that describes what your room will actually smell like.
How we measure throw distance
- One room every time: 18 by 14 feet, 9 foot ceiling, interior door closed, HVAC off.
- The candle sits at a fixed point on a table 30 inches high.
- Time to full melt pool is recorded from first light to the moment the pool reaches the vessel wall.
- At the two hour mark, a tester walks a marked line away from the candle and records the last distance at which the scent is unambiguously identifiable.
- Three or four separate units of every candle, and the readings are averaged.
This is not a laboratory instrument reading. Human noses fatigue, and the same person on two different days will differ by a foot or two. What it is good for is comparison, because every candle in our index has been through exactly the same room, the same table and the same line on the floor.
Matching throw to your room
| Space | Approx. area | Throw you need |
|---|---|---|
| Bathroom or entryway | Under 60 sq ft | 12 feet or more |
| Bedroom or home office | 100 to 150 sq ft | 15 feet or more |
| Living room, door closed | 200 to 280 sq ft | 20 feet or more |
| Open plan or great room | 400 sq ft and up | 24 feet, or two candles |
The most common buying mistake we see is a single 8 oz candle in an open plan apartment. There is no 8 oz candle on the market that will scent 500 square feet. Either buy a multi-wick pour, or place two candles at opposite ends of the space, which works better than one large one because scent moves badly across long rooms.
Things that quietly kill throw
- A tunneled candle. If the melt pool never reaches the glass, you are only using the middle of the wax and the throw drops immediately.
- An untrimmed wick. A tall flame burns fuel faster than it releases fragrance and produces soot instead of scent.
- Moving air. A ceiling fan or an open window will strip a scent out of a room faster than any candle can fill it.
- Scent fatigue. Your nose stops registering a fragrance after about twenty minutes. The candle is still working. You are not.
Questions
What is the difference between cold throw and hot throw?
Cold throw is the scent from an unlit candle. Hot throw is the scent released from the melt pool while it burns. Hot throw is far stronger and it is the number that determines what your room smells like.
Why can I not smell my candle anymore?
Most often olfactory fatigue: your nose stops registering a constant scent after roughly twenty minutes. Leave the room for five minutes and come back. If it is genuinely gone, check for tunneling or an untrimmed wick.
How many candles do I need for an open plan room?
Two, placed at opposite ends, rather than one large one in the middle. Scent travels poorly across long spaces, and two 20 foot throws cover a great room better than a single 26 foot throw.