How to Measure a Firewood Cord and Never Get Shortchanged

The word "cord" sounds precise, and it is. The problem is that almost nobody who sells firewood expects you to check the math, and plenty of sellers count on that. A pile dumped in the driveway looks like a lot of wood. Whether it is the amount you actually paid for is a question of volume, and volume is something you can measure with a tape and a calculator in about three minutes.

I have bought firewood from six different sellers over the years, and the only ones I trust now are the two who let me stack and measure before they took my money. This guide walks through exactly what a cord is, how to compute one from a stack you can see, and how to spot the face-cord trick that quietly hands you a third of the wood you thought you bought.

What a Full Cord Actually Is

A full cord is a fixed unit of volume: 128 cubic feet of stacked wood. The classic shape is a stack 4 feet high, 4 feet deep, and 8 feet long, because 4 × 4 × 8 equals 128. Any stack that multiplies to 128 cubic feet is a cord, whether it is the standard 4 × 4 × 8 or something taller and shallower.

The 128 figure counts the wood and the air gaps together. Split logs never pack solid, so of those 128 cubic feet, only about 70 to 90 cubic feet is real wood. That is normal and expected. The cord is a measure of neatly stacked volume, not of solid timber, and every honest seller works to the same definition. What matters is that the stack measures up — a cord that arrives at 110 cubic feet is short no matter how tightly it was thrown together.

The math is refreshingly simple:

cords = stacked volume in cubic feet ÷ 128

Measure the length, the height, and the depth of a neat stack in feet, multiply those three numbers to get cubic feet, then divide by 128. If you would rather not do the arithmetic by hand, the Firewood Cord Calculator takes the three measurements and returns the cord count, the face-cord count, and a cost per cord all at once.

Full Cord vs Face Cord: Where People Lose Money

Here is the single most common way buyers get shortchanged. A face cord has the same 4-foot height and 8-foot length as a full cord, but it is only one log deep — usually around 16 inches instead of the full 4 feet. Stand in front of one and it looks identical to a full cord, because the face you see is the same 4 × 8 wall of log ends. The depth is the only thing that changed, and the depth is exactly what you cannot see from the front.

A 16-inch-deep face cord works out to roughly one third of a full cord. Three face cords of 16-inch logs stack up to one full cord. So when a seller quotes you a price for "a cord" and delivers a face cord, you have paid full price for a third of the wood. Always confirm the depth, not just the height and the length. If someone says "cord" and the stack is only one log deep, you are looking at a face cord, whatever they call it.

A Worked Example: Measuring a Real Stack

Say a truck dumps a load and the driver swears it is a full cord. You stack it neatly against the garage wall. It comes out 8 feet long and 4 feet high, which is the standard face of a cord, so far so good. Then you measure the depth and the tape reads 2.5 feet, not the 4 feet a full cord needs.

Run the numbers:

Volume = 8 ft × 4 ft × 2.5 ft = 80 cubic feet
Cords = 80 ÷ 128 = 0.625 of a cord

So you have about five-eighths of a cord, not the full one you were charged for. If you paid 300 dollars, that load actually cost you 480 dollars per cord (300 ÷ 0.625). Having that number in hand before the truck leaves the street is the whole point — it turns a vague "this seems light" into a figure you can say out loud.

A cleaner case: a stack 8 feet long, 4 feet high, and 2 feet deep is 64 cubic feet, which is exactly half a cord. Once you have measured a few piles, your eye starts to calibrate, but the tape never lies and the division never flatters anyone.

Comparing Two Sellers Without Getting Fooled

Total price tells you almost nothing when two piles are different sizes. The only fair comparison is cost per cord, and it is easy once you have the volumes.

Suppose one seller wants 300 dollars for a pile that measures out to a full cord, and another wants 220 dollars for a pile that comes to two thirds of a cord. The second one looks cheaper on the sticker. But 220 ÷ 0.667 is about 330 dollars per cord, which is more than the first seller's 300. The smaller, cheaper-looking pile is the worse deal.

Convert every quote to a price per cord before you decide. Enter each pile's dimensions and price, read the cost per cord, and the comparison stops being a guess. This is the same discipline that makes any volume-based purchase honest — if you buy other materials by volume, the mulch and bark coverage calculator does the same job for landscaping loads sold by the cubic yard.

Working Backwards: Planning Space Before Delivery

The calculation runs in both directions. If you ordered two cords for the winter and need to know where it will go, multiply the other way: 2 cords × 128 cubic feet = 256 cubic feet. That is a stack 4 feet high, 8 feet long, and 8 feet deep, or any other set of dimensions that multiplies to 256. Mark out that footprint in the woodshed, buy a tarp the right size, and you avoid the discovery that the pile spills into the walkway.

Planning the space ahead of time also gives you a second check on the delivery. If two cords are supposed to fill a footprint you measured out and the actual pile leaves a third of that space empty, the load is short, and you knew the target volume before the truck even arrived.

A Few Habits That Pay Off

Three small rules cover most of the trouble. First, stack before you measure — loose tossed wood holds far more air, so roughly 180 cubic feet of heaped throw settles into 128 cubic feet stacked, and measuring the heap will badly overestimate what you have. Second, always check the depth, because that is where the face-cord trap lives. Third, talk in cords and price per cord, never in truckloads or "a big pile," because those words mean whatever the seller wants them to mean.

None of this requires trusting anyone. A tape measure, the number 128, and a quiet division are enough to keep every firewood purchase honest. Measure the stack, divide by 128, and the wood pays for itself in the savings the first time a load comes up short.

Made by Toolora · Updated 2026-06-13