Firewood Cords Produced per Acre (Woodlot Yield)
There is no dependable fixed number of firewood cords per acre. Yield depends on the trees present, the pieces you can use, the acreage actually harvested, and the removal plan. Inventory the stand, tally the wood you stack, and divide measured cords by harvested acres. Treat the result as a description of that harvest, not a guaranteed future yield.
A woodlot can look full and still produce less usable firewood than a quick estimate suggests. Some trees are defective, some sections are too small or rotten to keep, and steep ground or poor access can limit what you can safely remove. The useful question is not simply how many cords an acre holds. It is how many cords your measured stand can provide under a specific, responsible harvest plan.
In my work with woodlot inventories and firewood processing, I have found that clear records prevent two common mistakes: counting standing trees as finished cords and assuming one harvest rate applies to every acre. The method below connects tree inventory to actual stacked volume, while keeping the estimate tied to the land and the harvest prescription.
Woodlot Inventory, Yield Calculation, and Harvest Prescription
A woodlot yield is the quantity of firewood taken from a defined area under a stated harvest plan. To estimate it, map the acreage, record eligible trees and intended product sizes, estimate usable volume with a regional method, then compare the estimate with cords actually stacked.
What counts as a cord?
A full cord is 128 cubic feet of stacked wood, including the spaces between pieces. A common stack measures 4 feet high, 4 feet deep, and 8 feet long. Those dimensions describe the outside of the stack; 128 cubic feet is not 128 cubic feet of solid wood.
Use the same product dimensions throughout your tally. If your pieces are shorter or your stack is irregular, measure the stack’s length, height, and depth in feet, multiply those dimensions, and divide by 128. This gives an estimated number of full cords. Keep separate records for loose piles, unsplit rounds, and stacked firewood; they are not directly comparable without a suitable conversion method.
One acre contains 43,560 square feet. Map the area you will actually harvest, not just the property’s total acreage. Exclude land you will not cut, such as inaccessible ground or areas kept out of the operation, so the denominator matches the harvest.
How to estimate yield from a stand
Record each candidate tree’s species, diameter at breast height (DBH), condition, and intended use. DBH is the trunk diameter measured 4.5 feet above ground. Regional forestry tables or a forester’s inventory method can help estimate standing volume. Then account for the firewood product you plan to make, including length and minimum piece size.
Standing volume is not the same as stacked cords. A conversion from solid wood volume to stacked firewood must fit the species, piece dimensions, and local measuring method. There is no universal factor that reliably turns any standing-volume estimate into cords. Basal area, the cross-sectional area of tree trunks per acre, can describe stand density, but it does not by itself tell you how many cords are recoverable.
The clearest calculation uses the finished product:
Cords removed per acre = measured stacked cords removed ÷ acres harvested
| Measured harvest | Area actually cut | Result |
|---|---|---|
| 6 stacked cords | 2 acres | 3 cords per acre |
| 5 stacked cords | 1.25 acres | 4 cords per acre |
| 4 stacked cords | 0.5 acre | 8 cords per acre |
These are arithmetic examples, not expected yields for particular woods. The last result does not mean the half-acre can safely produce eight cords every year. It describes one measured harvest over that area.
A practical inventory sequence
- Map and mark the unit. Confirm boundaries and acreage. Mark access routes, wetlands, steep ground, retained trees, and areas where you want regeneration.
- Set the product specification. Choose firewood length and minimum piece size before tallying. Decide which species and tree conditions count as usable firewood.
- Tally eligible trees. Record species, DBH, and condition. Note defects, rot, broken tops, and other factors that may reduce usable wood.
- Estimate, then verify. Use regional tables or a forester’s method for standing volume. During cutting, record actual stacked volume and the acreage harvested.
- Report the result with its limits. State the area, species mix, product dimensions, and harvest prescription with the cords-per-acre figure.
A few large trees can make an acre look more productive than it is. Defects, unusable sections, breakage, access limits, and spaces within stacks all affect the amount of firewood recovered. Do not present an estimate based on a few trees or basal area as a guaranteed harvest or sustainable annual yield.
Equipment Setup, Site Safety, and Field Cutting
Equipment does not set the cords-per-acre figure; the stand and harvest plan do. Still, matching the saw to the wood you will cut helps you work within the tool’s limits. Before felling or bucking, inspect required safety gear, check the saw against its manual, and assess each tree and the work area.
Choose a saw, bar, and chain for the largest wood you will actually buck. Use only bar and chain combinations approved by the saw manufacturer, and follow its operating limits. A larger estimated woodlot yield is not a reason to fit an unapproved bar or use equipment beyond its capacity.
Before starting, inspect personal protective equipment and the saw’s chain brake, throttle lockout, chain catcher, bar, chain tension, and sharpness. Use the fuel and bar oil specified in the manual. Confirm the work area is clear, keep bystanders away, and plan an escape route before felling. Assess tree lean, defects, overhead hazards, and nearby people. If you cannot assess or manage the hazards competently, do not fell the tree; get qualified help. Follow applicable OSHA logging requirements and equipment instructions.
Cut only trees marked under the harvest prescription. Buck to the planned length, and keep the product dimensions consistent where practical. If tree condition or actual wood differs from the inventory, update the tally rather than forcing the harvest to match the estimate.
Illustrative harvest scenarios
These examples show how the method works; they do not report surveyed woodlots or predict a yield for any species.
- Mixed stand, two-acre unit: The plan marks trees across two mapped acres. After cutting and stacking, the tally is six cords. The measured yield is 3 cords per harvested acre. Record the species and tree condition so the result can be understood later.
- Accessible one-acre unit with cull wood: The initial inventory suggests more standing volume than the crew can use. Rot and short sections reduce the finished stack to three cords. The result is 3 cords per acre, not the larger figure suggested by standing volume alone.
- Partial-acre harvest: A measured stack contains four cords from half an acre. The calculation gives 8 cords per acre for that harvest. It does not establish that the site can produce that amount again on a regular schedule.
The key difference is between a measured harvest and a forecast. A measured result tells you what came off a defined area under one set of conditions. A forecast requires a sound inventory and a defensible prescription for future growth and removals.
Tallying Cords, Chain Maintenance, and Equipment Checks
A harvest tally is the record of what you actually removed and stacked from a known area. Measure stacks rather than relying on memory or the number of trees felled. Keep species and product notes with the cord total, then maintain the saw as its maker directs during and after the work.
For a rectangular stack, measure length, height, and depth in feet. Multiply the measurements to get stacked cubic feet, then divide by 128 for full-cord equivalents. For example, a stack measuring 8 feet long, 4 feet high, and 4 feet deep contains 128 cubic feet of stacked space, or one full cord. If a stack has uneven ends or height, take consistent measurements and note that the result is an estimate.
Record the harvested area to match the stack. If you take wood from different mapped units, tally each unit separately. A property-wide cord total divided by acreage that includes unharvested land can make the harvest rate appear lower than it was. Conversely, dividing by an area smaller than the actual cut can overstate it.
Use a simple harvest record:
| Field note | What to record |
|---|---|
| Harvest unit | Map name or boundary and measured acres |
| Stand | Species, DBH range, and tree condition |
| Prescription | Trees marked for removal and trees retained |
| Product | Firewood length and minimum piece size |
| Output | Stack dimensions and cord equivalent by species |
| Limits | Access issues, defects, breakage, or unusable sections |
During work, keep the chain sharp and tensioned as the manual specifies. Stop the saw before inspection or adjustment, and follow the maker’s shutdown and maintenance directions. After the work, shut it down and let it cool safely before cleaning. Inspect the chain and other parts, maintain them as specified, and store fuel and equipment according to the manufacturer’s instructions.
Woodlot Recovery, Saw Storage, and Seasonal Follow-Up
Recovery is the condition of the remaining stand and its regeneration after cutting. A cord-per-acre tally describes wood removed; it does not show whether that removal fits the site’s long-term goals. Record retained trees and new growth, review the harvest against the prescription, and seek forestry advice when long-term yield or sensitive ground matters.
Close out each unit by noting which trees remain, where regeneration is present, and whether access routes or sensitive areas were affected. Compare the actual removal with the plan. If the harvest took more or less usable wood than expected, document why. That information can improve the next inventory, but it does not by itself establish how soon the stand can be cut again.
Set removal levels based on stand condition, regeneration, measured growth, and management objectives, not a generic cords-per-acre target. A forester can help prescribe removals when timber quality, sensitive sites, or long-term yield are important. There is no single safe annual cord figure that applies across woodlots.
Store the saw and fuel as directed by the manufacturer, and note any maintenance or repair needs before the next job. Keep the harvest tally with your map and prescription. Over time, these records let you compare measured removals across units and seasons without confusing one harvest result with a guaranteed supply.
Bottom line: map the acres you cut, define the firewood product, and measure the stacked output. Divide cords by harvested acres, then report the species, stand condition, and harvest method alongside the result. That is a useful woodlot yield figure; a bare number is not.
Frequently Asked Questions
How many cords of firewood can one acre produce?
There is no universal figure. Yield depends on species, tree size and condition, product dimensions, access, and the amount allowed under the harvest plan.
How do I calculate cords per acre?
Measure the stacked cords removed and divide by the acres actually harvested. Keep the area and cord tally tied to the same mapped unit.
How many cubic feet are in a full cord?
A full cord occupies 128 cubic feet when stacked, including air spaces between pieces. It is not 128 cubic feet of solid wood.
Can I estimate cords from basal area?
Not by itself. Basal area measures trunk cross-sectional area per acre, but it does not show tree height, species, defects, usable sections, or stacked product volume.
Can I convert standing timber volume directly into cords?
Not with one universal conversion. The conversion must fit the species, piece size, product dimensions, and local measurement method.
Do tree species affect cords per acre?
Yes. Species mix affects the amount and kind of wood in a stand, but species alone cannot determine yield. Tree size, condition, and harvest choices matter too.
Should I count every tree in the inventory?
Record the trees relevant to your harvest plan, including species, DBH, condition, and intended use. Note retained trees and regeneration goals as well.
Does a high measured yield mean I can harvest the same amount again?
No. The measurement describes one harvest from a defined area. Future removals depend on stand condition, growth, regeneration, and management goals.
Why can actual cords be lower than my estimate?
Defects, rot, unusable sections, breakage, access limits, and product-size requirements can reduce recovery. A standing-volume estimate is not finished, stacked firewood.
When should I consult a forester?
Consult one when you need a long-term removal plan, when timber quality matters, or when the site includes sensitive ground or difficult management choices.
(This article was written by one of our staff writers, Samuel Vance. Visit our Meet the Team page.)
