What Is the Difference Between Oak and Hickory? (BTU & Density Test)
Hickory is usually denser than oak, so a cord of well-seasoned hickory can contain more usable heat than a cord of oak. But the difference depends on the species, moisture, and how tightly the wood is stacked. Per pound of dry wood, common hardwoods have similar energy. A fair comparison needs equal volumes, measured moisture, and a consistent method.
In much of the eastern United States, oak and hickory are familiar firewood choices, but the names cover several species. A red oak log and a white oak log do not have identical properties, and hickories vary too. When I explain this comparison, I start with a simple point: a wood’s weight, moisture, and stack volume all affect the heat you get.
The guide below shows how to compare the woods without treating one BTU figure as a guarantee. It also explains safe cutting and handling, since dense wood is not a reason to use a chainsaw outside its rated setup.
What Is the Difference Between Oak and Hickory?
Oak and hickory are both hardwoods, but hickory is often denser by volume. That can mean more dry wood, and therefore more potential heat, in a well-packed cord. Their heat per pound is much closer. Species, moisture, and stacking can change the practical result.
“Hardwood” describes wood from broadleaf trees; it does not mean every hardwood is equally hard or heavy. Oak and hickory can both make useful firewood when properly seasoned. The key distinction is often heat per stacked volume, not a dramatic difference in the energy of each pound of dry wood.
Hickory’s higher density range suggests an advantage when comparing equal volumes under similar conditions. But the ranges overlap, and “oak” and “hickory” each include multiple species. A particular oak sample may be denser than a particular hickory sample.
Why do BTU ratings vary?
BTU, or British thermal unit, measures heat energy. Oven-dry wood from common hardwoods contains roughly 8,000–9,000 BTU per pound. Species differences per pound are modest compared with the effect of water in the wood. A wet log must lose that water as it heats, so it provides less useful heat for warming a room.
Published firewood charts commonly put seasoned oak and hickory in the mid-to-high 20 million BTU per cord range. Those numbers are references, not promised outputs. A cord is a stacked volume, and the amount of solid wood in a stack changes with log shape, size, and how the pieces fit together.
| Comparison | Oak | Hickory |
|---|---|---|
| Basic specific gravity, common reference range | White oak: about 0.60–0.68 | About 0.64–0.83, depending on species |
| Dry energy per pound | Roughly 8,000–9,000 BTU across common hardwoods | Roughly 8,000–9,000 BTU across common hardwoods |
| Heat per stacked cord | Often in the mid-to-high 20 million BTU range | Often in the mid-to-high 20 million BTU range |
| Main comparison point | Species and moisture matter | Often more heat per equal stacked volume, but not in every comparison |
Specific gravity here means oven-dry wood mass divided by green wood volume. It is a useful species reference, but it is not a direct reading of how much heat a wet, split log will deliver. The figures above are broad ranges, not a ranking of every oak against every hickory.
How to Compare Oak and Hickory by Density and BTU
A useful comparison controls the factors that can hide the species difference. For density, compare equal volumes at the same moisture level. For heat, compare dry wood by mass or use a controlled calorimeter. A casual burn test cannot isolate species from moisture, size, airflow, or fire conditions.
A density test compares mass with volume. If one same-sized sample weighs more under the same moisture conditions, it is denser. A BTU test measures heat released; a reliable test needs controlled equipment, not a fireplace or open fire.
A practical density test
- Identify the wood as accurately as practical. Do not rely on bark alone; bark can be misleading, and oak and hickory each include several species.
- Cut or select pieces with the same measured volume and similar grain direction. Record the dimensions and calculate volume using the same units for both.
- Measure moisture on a freshly split face with a suitable wood moisture meter. Aim to compare pieces at the same moisture content.
- Weigh each piece on the same scale. Divide mass by volume, then record the species, moisture reading, and method.
A green-volume specific-gravity reference is not the same as weighing an arbitrary wet piece. If the samples differ in moisture, water adds weight and can make the denser wood appear heavier for the wrong reason. For a simple homeowner test, matching moisture is more useful than trying to reproduce a laboratory value.
A fair BTU comparison
For heat output, use equal dry masses or equivalent dry-volume samples and a controlled, instrumented calorimeter. A calorimeter measures heat released under a set test method. Do not conduct an open-fire BTU test indoors or near buildings. Smoke, fire, and carbon monoxide create serious hazards, and an uncontrolled burn does not produce a reliable comparison.
If you are choosing fuel for home heating, check the actual moisture of the wood you plan to burn. A reading of 20% or less, taken on a freshly split face with a suitable meter, is a common target. Meter readings may use wet-basis or dry-basis moisture conventions; do not compare results from different conventions as if they were identical.
Oak vs. Hickory: Equipment Setup and Safety Preparation
A chainsaw can cut either species when it is in good condition and set up as its maker specifies. Dense wood does not justify a longer bar, a different fuel mix, or a chain that does not match the saw. The manual determines the approved bar and chain setup for your model.
Before cutting, identify the saw’s required chain pitch, gauge, and drive-link count. These must match the bar and sprocket. Fuel-oil ratio, idle speed, maximum operating speed, and chain settings are also model-specific. A setup that works on one saw may be wrong for another.
Check the work area and the log before starting. Support the wood so it cannot roll or pinch the bar as the cut closes. Inspect protective equipment, chain tension, the chain brake, and the saw according to its manual. Follow the manual and applicable ANSI Z133 requirements for the work.
Kickback can happen when the upper part of the guide-bar nose contacts wood. The saw may then move up and back toward the operator, causing severe injury. Keep a firm two-handed grip, keep the bar nose clear, and do not cut with the bar tip.
Field Cutting and the Density/BTU Comparison
A field comparison is useful when you label the species, control sample size and moisture, and record what you actually measured. It is not a substitute for a laboratory heat test. The point is to make a fair, repeatable comparison, not to prove that every hickory log beats every oak log.
Consider two same-volume pieces from a mixed woodpile. If the hickory sample weighs more, first check that both were measured at similar moisture and that the pieces have similar dimensions. If they are not, the difference may reflect water or sample shape rather than species.
| Your goal | Compare this way | Avoid this shortcut |
|---|---|---|
| Estimate density | Equal volume, similar moisture, same scale | Comparing a wet round with a dry split |
| Compare heat by mass | Equal dry mass in controlled equipment | Judging by how hot one short fire feels |
| Compare firewood supply | Similar cord volume and similar seasoning | Treating a published cord value as guaranteed |
| Identify a species | Use several features or a reliable identification guide | Deciding from bark alone |
When bucking, let a sharp, correctly matched chain do the work. If the chain cuts poorly, stop and inspect it rather than forcing it through dense wood. Check for damage, tension, and sharpness, then follow the manual for sharpening and chain adjustment. Do not use a generic raker setting: the correct setting depends on the chain design and maker’s instructions.
Saw Maintenance, Chain Sharpening, and Tuning
Routine care helps the saw cut both species as designed. A dull chain can make cutting slow and tiring, while a mismatched chain or incorrect adjustment can create unsafe operation. Use the saw and chain makers’ instructions for sharpening, tension, fuel, and tuning; there is no single setting that fits every model.
After cutting, inspect the chain and bar for wear or damage. Clean and service the saw as directed in the manual. If the saw runs poorly or the chain will not cut correctly after basic checks, stop and consult the manual or a qualified service provider instead of changing engine settings by guesswork.
Storage, Seasoning, and Seasonal Care
Seasoning is the process of drying cut firewood. Store oak and hickory so air can reach the stack, and check moisture rather than relying only on how long the wood has been stored. Species and conditions affect drying time, so a calendar estimate cannot confirm that a log is ready to burn.
Keep firewood stored in a way that follows local fire-safety guidance and protects it from excess moisture. Before burning, split a piece and measure the fresh face. Use wood at 20% moisture content or less as a practical target, and follow the meter maker’s instructions.
Store fuel and equipment according to the saw manufacturer’s instructions. Keep the saw maintained and ready for the next job, but do not assume a seasonal service step or fuel mixture is universal.
Conclusion: Which Firewood Should You Choose?
Hickory is often the denser choice and may provide more heat per stacked volume, but that is not a guarantee for every load. Oak and hickory have similar energy per pound when dry. For a sound comparison, identify the species, match moisture, compare equal volumes for density, and treat cord BTU figures as estimates.
Frequently asked questions
Does hickory always produce more heat than oak?
No. Hickory is often denser, but species, moisture, and stack packing affect heat per cord. A particular oak load can compare favorably with a particular hickory load.
Is hickory hotter than oak per pound?
Not by a large, reliable amount. Common hardwoods contain roughly 8,000–9,000 BTU per pound when oven-dry, so moisture and density often matter more in real firewood use.
Which is denser, oak or hickory?
Hickory commonly has a higher specific-gravity range than white oak, but the ranges overlap. The exact species and sample conditions matter.
What moisture level should firewood reach before burning?
A common target is 20% moisture content or less, measured on a freshly split face with a suitable meter. Follow the meter instructions and note its moisture convention.
Can I compare wood by lifting two logs?
That is only a rough impression. Log size, shape, and moisture affect weight. For a better density comparison, weigh equal-volume samples at similar moisture.
How many BTUs are in a cord of oak or hickory?
Published tables commonly place seasoned oak and hickory in the mid-to-high 20 million BTU range per cord. Treat any single figure as an estimate, not a guaranteed yield.
Can I test BTUs by burning samples in a fireplace?
No. A fireplace burn is uncontrolled and cannot isolate the wood species from moisture, airflow, and sample size. Use a controlled, instrumented calorimeter for a heat comparison.
Does dense wood need a special chainsaw chain?
Not just because it is dense. Use the chain type and size approved for your saw, with pitch, gauge, and drive-link count matched to the bar and sprocket.
Should I press harder if my saw struggles in hickory?
No. Stop and inspect the chain, tension, and setup. Sharpen or correct the issue as the manual directs rather than forcing the saw through the cut.
(This article was written by one of our staff writers, Evan Bradley. Visit our Meet the Team page.)
