What Is Western Red Cedar’s BTU Rating? (BTU Chart)
Seasoned western red cedar provides about 12.2 million BTU per standard cord, a useful estimate rather than a guaranteed amount of room heat. A standard cord is 128 cubic feet of stacked wood. Cedar lights readily and burns relatively quickly, so it usually needs more frequent loading than denser hardwoods. Dry it to 20% moisture or less before burning.
If a firewood chart gives you a number but not its conditions, it can be hard to know what that number means for your stove. The quick answer is to treat 12.2 million BTU per cord as an estimate of the wood’s fuel energy, not as a promise about heat delivered to your room.
I use two checks to make the number useful: confirm the wood is western red cedar, then check its moisture on a freshly split face. Those steps help you compare firewood more fairly and avoid relying on a “seasoned” label alone.
What does western red cedar’s BTU rating mean?
A BTU, or British thermal unit, is a measure of energy. A BTU-per-cord rating estimates the energy in a full cord of wood under stated or assumed conditions. It does not tell you how much heat a particular stove will deliver, or how long each load will burn.
Western red cedar is commonly listed at about 12.2 million BTU per standard cord. That figure is best used to compare approximate fuel energy, not to predict exact heating performance. Species identification, moisture, piece size, stacking, and the reference used can all affect the reported number.
The cord is a measure of stacked volume, not a fixed amount of solid wood. Gaps between pieces take up space, and their size depends on how the firewood is split and stacked. So two piles that each measure a cord can hold different amounts of wood.
Why the BTU number is not the heat you feel
BTU per cord describes the fuel’s estimated energy, not the heat that reaches your living space. Some energy is used to evaporate water in the wood, and some is lost during combustion and through the appliance or flue. The appliance’s efficiency also affects the usable heat.
For that reason, do not read 12.2 million BTU per cord as a stove’s hourly output. Hourly output depends on the appliance, the load, and how it is operated. Follow the stove or fireplace manufacturer’s instructions for fuel size, loading, and airflow.
Western red cedar BTU chart
This chart gives approximate heat values per standard cord. Values vary among references and can shift with moisture content, species identification, and stacking. Use the figures as broad comparisons, not exact ratings for a particular pile or guaranteed amounts of delivered heat.
| Wood species | Approximate BTU per standard cord |
|---|---|
| Western red cedar | 12.2 million |
| Ponderosa pine | About 16 million |
| Douglas fir | About 20 million |
| Red oak | About 24–27 million |
Among these examples, western red cedar has the lowest listed heat value per cord. That does not mean it cannot be useful firewood. It means you may need more volume, or need to reload more often, than you would with a denser wood to maintain a similar fire.
A simple portion-of-a-cord calculation can help with planning. One-eighth of a cord is one-eighth of the listed estimate, or about 1.525 million BTU of fuel energy at the 12.2-million figure. This is arithmetic based on the chart, not a promise of usable room heat; moisture and appliance performance still matter.
Moisture, seasoning, and usable heat
Moisture content tells you how much water remains in the wood. For firewood, aim for 20% moisture or less, checked with a meter on a freshly split interior face. “Seasoned” describes wood that has been left to dry, but the word alone does not confirm its current moisture level.
Water in the wood must be heated and driven off as vapor during burning. As a result, wet wood can provide less useful heat and produce more smoke than dry wood. A dry-looking bark surface or a long storage time does not prove the inside is ready to burn.
How to check cedar before burning
- Split a sample piece so you can measure the fresh interior, not the outside surface.
- Follow the moisture meter’s instructions and take the reading on that freshly split face.
- If the reading is above 20%, continue drying and check again before burning it.
- Do not rely only on bark, appearance, storage time, or a hot exterior surface to judge dryness.
Cedar can ignite readily and burn relatively quickly, but that does not make wet cedar a good choice. In a restricted-air fire or an oversized load, wet wood can smolder. Smoldering increases smoke and creosote deposits, which can raise the risk of a chimney fire.
Do not try to make green or unverified-moisture wood burn by closing the air control. Use dry fuel and manage airflow as directed by the appliance maker.
Equipment setup and firewood safety preparation
Before burning cedar, confirm the wood species and make sure the appliance is approved for wood. Check its manual for permitted fuel, piece size, load limits, and operating instructions. The BTU rating does not override those limits; a lower-energy wood is not a reason to overload a stove or fireplace.
Keep firewood clear of the building and appliance clearances required by the manufacturer and applicable instructions. If you are unsure whether the appliance is designed for wood, check its label or manual rather than assuming it is safe for that use.
Field cutting and firewood processing
Split cedar to a size that fits the appliance’s approved fuel dimensions. The right size depends on the appliance, so I would check its manual before preparing a large batch. Smaller pieces may be easier to fit, but do not use that as a reason to exceed the appliance’s loading limits.
Chainsaw fuel mix, bar length, chain pitch, chain gauge, tension, and operating speed are separate from cedar’s BTU rating. They depend on the saw model. Use the saw manufacturer’s specifications; there is no universal cutting setup that can be inferred from the type of wood.
Storage and seasonal care
Store split firewood off the soil, with the top covered and the sides open to allow airflow. This setup helps keep rain off the stack while letting air move around the wood. Storage time alone does not establish dryness, so check moisture before burning.
Split pieces to the size your appliance allows, then stack them so air can reach the wood. Recheck a freshly split face before use, especially if the wood has been stored outdoors or its drying conditions have changed. Treat the meter reading, not the label or calendar, as the practical check.
Moisture verification, maintenance, and appliance inspection
Dry cedar still needs proper appliance operation and routine care. Follow the manufacturer’s schedule for ash removal and flue inspection or cleaning. Stop using the appliance and arrange an inspection if smoke spills into the room, the flue is obstructed, or deposits appear excessive.
Practical scenarios: what the rating means at home
These examples are planning scenarios, not measured stove tests. They show how to use the cord estimate without treating it as a guaranteed heat output.
- A small, dry cedar supply: If you have one-eighth cord at the chart estimate, its fuel energy is about 1.525 million BTU. Your room will receive less than that, and the actual amount depends on the wood and appliance.
- A comparison with oak: The chart lists red oak at about 24–27 million BTU per cord, versus about 12.2 million for western red cedar. If both cords were measured and prepared on comparable terms, the oak estimate is roughly twice cedar’s. Real piles may not be equivalent in moisture or stacking.
- Cedar that still reads above 20%: Do not count on its listed cord value as a reliable estimate of usable heat. Continue drying it, check again on a fresh split face, and use dry fuel in the meantime.
The practical takeaway is that western red cedar can be used in a wood-approved appliance when dry and loaded within its limits. Expect a relatively quick burn and plan for more frequent loading than with denser firewood, while following the appliance instructions.
Frequently asked questions
The answers below clarify what the western red cedar BTU estimate can and cannot tell you. They cover the cord measurement, moisture check, comparisons with other species, and safe use. For appliance-specific loading or operating details, use the manufacturer’s manual.
How many BTUs are in a cord of western red cedar?
A standard cord of western red cedar is estimated at about 12.2 million BTU. This is fuel energy, not guaranteed heat delivered to your room. Moisture, stacking, species identification, and appliance efficiency can change the real-world result.
What is a standard cord of firewood?
A standard cord is 128 cubic feet of stacked wood, commonly measured as a stack 4 feet high, 4 feet deep, and 8 feet long. The gaps between pieces count as part of that volume, so the solid-wood amount can vary with piece size and stacking.
Is western red cedar good firewood?
Dry western red cedar can be used in an appliance approved for wood, as long as you follow its fuel and loading limits. It has a relatively low heat value per cord and burns quickly, so it may require more frequent loading than denser hardwood.
How dry should cedar firewood be?
Aim for 20% moisture content or less. Check with a moisture meter on a freshly split face. The word “seasoned” does not prove a specific moisture level, and the bark or outside surface can look dry while the interior remains wetter.
Does cedar produce more heat than pine?
The chart estimates western red cedar at about 12.2 million BTU per cord and ponderosa pine at about 16 million. These are approximate values; the result depends on the reference, wood condition, and how each cord is measured and stacked.
How does cedar compare with Douglas fir or oak?
The approximate chart values are 20 million BTU per cord for Douglas fir and 24–27 million for red oak, compared with 12.2 million for western red cedar. These figures are broad comparisons, not guaranteed delivered-heat ratings.
Can I burn cedar that is still wet?
Do not burn cedar that is green or has unverified moisture as a way to compensate by restricting airflow. Wet wood can smolder, making more smoke and creosote. Dry it and confirm moisture on a freshly split face before use.
Does 12.2 million BTU mean my stove will produce that much heat?
No. The number estimates energy in the cord. Moisture evaporation, combustion losses, and appliance efficiency reduce the heat delivered to the room. It is not an hourly stove-output rating; use the appliance’s specifications for operating guidance.
(This article was written by one of our staff writers, Evan Bradley. Visit our Meet the Team page.)
