How long do candles last? Burn time by size and how to calculate it
October 11, 2026 · 3 min read
The short answer: a container candle's burn time depends mostly on how much wax it holds and how fast its wick consumes that wax. Many makers estimate roughly 5–8 hours of burn time per ounce of wax for container candles, but that is a rough rule of thumb — wax type, wick size, fragrance and how the candle is burned all change the real number. The only reliable figure is one you measure.
Estimated burn time by candle size
Uses a rough 5–8 hours per ounce rule of thumb (midpoint 6.5). Not a claim for any specific candle — measure your own.
Chart data
| Item | Value ( hrs) |
|---|---|
| 4 oz | 26 hrs |
| 8 oz | 52 hrs |
| 12 oz | 78 hrs |
| 16 oz | 104 hrs |
How to calculate candle burn time
Example only: a candle weighs 0.6 oz less after a 4-hour burn cycle. Its burn rate is 0.6 ÷ 4 = 0.15 oz per hour. With 8 oz of wax, estimated burn time is 8 ÷ 0.15 ≈ 53 hours — inside the rough range in the chart. Measure several cycles and average them, because the rate changes as the wax level drops. Never publish a burn time you have not tested.
CandleScience defines a burn cycle as about four hours of burning followed by cooling, in its candle making terms glossary. Use the same cycle length every time so your results are comparable.
What shortens or extends burn time
| Factor | Effect | What to do |
|---|---|---|
| Oversized wick | Burns wax faster, larger flame | Test a smaller wick size |
| Untrimmed wick | Larger flame, faster consumption, soot | Trim before every burn |
| Drafts | Uneven, faster burn | Burn away from vents and fans |
| Very long burns | Overheating, faster consumption | Follow label burn-time limits |
| Tunneling | Wasted wax on the walls | Correct wick size and first-burn guidance |
The National Candle Association's fire safety tips advise trimming wicks and not burning candles for longer than the manufacturer recommends. Those habits protect both safety and burn time. For soot-related issues see why candles soot and wicks mushroom.
How long do unlit candles last?
Unlit candles can be kept for a long time, but fragrance and color can fade, especially with heat and sunlight. Store candles cool, dark and lidded. Many makers suggest customers enjoy scented candles within about a year for the best throw — treat that as guidance, not a hard expiration. Read our fragrance oil storage guide for the ingredient side.
Should you print burn time on your label?
- Only list a burn time you have measured with your exact recipe.
- Use an approximate range ("approx. 45–50 hours") rather than a precise number.
- Retest after changing wax, wick, fragrance or vessel.
- Keep the test record with the product so you can back up the claim.
Log burn tests in WaxLogic next to each product and recipe, and use the candle calculator to know exactly how much wax goes into each size.
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