Convert Thousand Sq Ft (1/8" panels) to Thousand Sq Ft (1/4" panels)
Thousand Sq Ft (1/8" panels) (TSF (1/8")) to Thousand Sq Ft (1/4" panels) (TSF (1/4")) lumber volume conversion — enter any value below to get an instant result, or use the table for common values.
Results from this calculator are estimates provided for general informational purposes only, based on formulas, rates, and standards commonly accepted as of 2026. Figures may differ slightly from other calculators or professional sources due to rounding methods, differing assumptions, or regional regulations, and rules may change over time. Always consult a qualified professional — such as a financial advisor, healthcare provider, or other relevant specialist — before making decisions based on these results.
Result
1 TSF (1/8") = 0.5 TSF (1/4")
1 Thousand Sq Ft (1/8" panels) = 0.5 Thousand Sq Ft (1/4" panels)
1 Thousand Sq Ft (1/4" panels) = 2 Thousand Sq Ft (1/8" panels)
1 TSF (1/8") in every supported unit
Conversion chart: Thousand Sq Ft (1/8" panels) to Thousand Sq Ft (1/4" panels)
Conversion table
| Thousand Sq Ft (1/8" panels) (TSF (1/8")) | Thousand Sq Ft (1/4" panels) (TSF (1/4")) |
|---|---|
| 0.01 TSF (1/8") | 0.005 TSF (1/4") |
| 0.1 TSF (1/8") | 0.05 TSF (1/4") |
| 1 TSF (1/8") | 0.5 TSF (1/4") |
| 2 TSF (1/8") | 1 TSF (1/4") |
| 3 TSF (1/8") | 1.5 TSF (1/4") |
| 5 TSF (1/8") | 2.5 TSF (1/4") |
| 10 TSF (1/8") | 5 TSF (1/4") |
| 20 TSF (1/8") | 10 TSF (1/4") |
| 50 TSF (1/8") | 25 TSF (1/4") |
| 100 TSF (1/8") | 50 TSF (1/4") |
| 1000 TSF (1/8") | 500 TSF (1/4") |
Thousand Sq Ft (1/8" panels) (TSF (1/8"))
Definition: A sheet-goods volume unit representing 1,000 square feet of panel material at 1/8 inch thickness — one of several thickness-specific "thousand square foot" (TSF) units used for plywood and OSB.
History: Adopted by the panel-products industry (plywood and oriented strand board manufacturers) because sheet goods are conventionally priced and measured by surface area at a given thickness rather than by raw volume.
Current use: Used in plywood, OSB, and panel-product manufacturing and sales to convert between panel volume and the industry-standard thousand-square-foot area measure.
Thousand Sq Ft (1/4" panels) (TSF (1/4"))
Definition: The same thousand-square-foot panel unit as its 1/8-inch counterpart, scaled to 1/4 inch panel thickness — exactly twice the volume per thousand square feet.
History: Part of the same panel-industry TSF convention, with a separate thickness-specific unit for each common panel gauge sold in the sheet-goods trade.
Current use: Used for volume-to-area conversions of 1/4-inch plywood and OSB panels, one of the most common sheathing thicknesses.
Supported Units
| Unit | Symbol | In m³ |
|---|---|---|
| Cubic Meter | m³ | 1 m³ |
| Cubic Foot | ft³ | 0.028316847 m³ |
| Cubic Inch | in³ | 1.63871E-05 m³ |
| Board Foot | bf | 0.0023597372 m³ |
| Thousand Board Feet | MBF | 2.3597372 m³ |
| Cord | cord | 3.6245564 m³ |
| Cord (80 ft³) | cord (80 ft³) | 2.2653477 m³ |
| Cord Foot | cord ft | 0.45306955 m³ |
| Cunit | cunit | 2.8316847 m³ |
| Pallet | pallet | 0.040115533 m³ |
| Cross Tie | tie | 0.094389489 m³ |
| Switch Tie | tie (switch) | 0.14866344 m³ |
| Thousand Sq Ft (1/8" panels) | TSF (1/8") | 0.29496715 m³ |
| Thousand Sq Ft (1/4" panels) | TSF (1/4") | 0.5899343 m³ |
| Thousand Sq Ft (3/8" panels) | TSF (3/8") | 0.88490146 m³ |
| Thousand Sq Ft (1/2" panels) | TSF (1/2") | 1.1798686 m³ |
| Thousand Sq Ft (3/4" panels) | TSF (3/4") | 1.7698029 m³ |
About These Parameters
- Value
- The amount of lumber or timber volume you want to convert, expressed in the "From" unit — a lumberyard's board-foot quantity, a firewood seller's cord count, or a sawmill's cubic-meter output.
- From Unit
- The unit your value is currently measured in — a hardware-store board-foot price, a firewood cord, a pulp mill's cunit, or a railroad's cross-tie count.
- To Unit
- The unit you want the result converted into. Use the swap button to flip From and To instantly, handy when translating between a retail unit like the board foot and a wholesale unit like the thousand board feet.
How Lumber Volume Conversion Works
The Formula
Every unit here is defined by a fixed multiplier relative to the cubic meter. To convert a value from one unit to another:
result = value × (factor of "From" unit ÷ factor of "To" unit)
For Thousand Sq Ft (1/8" panels) → Thousand Sq Ft (1/4" panels): multiply by 0.5. For example, 1 TSF (1/8") × 0.5 = 0.5 TSF (1/4").
The Board Foot and the Cord: America's Retail Lumber Units
The board foot became the North American lumber trade's standard as sawmills industrialized in the 19th century, giving buyers and sellers a consistent way to price sawn boards of varying width and length on the same volume basis. The cord predates it by centuries, going back to the colonial-era firewood trade — a stack 4 feet high, 4 feet wide, and 8 feet long (128 cubic feet including the air gaps between logs), literally measured out and bound with a cord of rope before sale, which is where the name comes from. Both units remain the everyday retail measures of the US and Canadian lumber and firewood trade today.
Wholesale and Industry-Specific Units
Once volumes move beyond individual retail purchases, the trade shifts to bulk and industry-specific units: the thousand board feet (MBF) scales the board foot up for sawmill production and wholesale shipment quotes, while the cunit (100 cubic feet of solid wood) gives the pulp and timber industry a shape-neutral wholesale unit for raw logs and wood chips that don't naturally divide into board-foot-shaped planks. Railroads use their own units entirely — the cross tie and the larger switch tie — to convert raw timber volume directly into the number of finished ties a given quantity will yield. Sheet-goods manufacturers, meanwhile, price plywood and OSB by the thousand square feet at a specific panel thickness, since surface area at a known thickness is how that segment of the industry has always measured volume.
Example
1 TSF (1/8") equals 0.5 TSF (1/4"). For scale, a single 2×4 stud 8 feet long is a little over 5 board feet, a full cord of firewood is 128 cubic feet stacked (about 80 cubic feet of solid wood once air gaps are excluded), and a standard cunit represents 100 cubic feet of solid timber — roughly the volume of several full-grown log sections.
Frequently Asked Questions
How many Thousand Sq Ft (1/4" panels) are in 1 Thousand Sq Ft (1/8" panels)?
1 Thousand Sq Ft (1/8" panels) (TSF (1/8")) equals exactly 0.5 Thousand Sq Ft (1/4" panels) (TSF (1/4")).
What is a board foot exactly?
A board foot is the volume of a plank 1 foot long, 1 foot wide, and 1 inch thick — 144 cubic inches. It's the standard unit US lumberyards use to price sawn boards and dimensional lumber, regardless of the actual length or width the board is cut to, since the volume (and therefore the board-foot count) is what determines the price.
Why is a cord 128 cubic feet but the "solid" cord only about 80?
A full stacked cord occupies 128 cubic feet (4 × 4 × 8 feet), but that figure includes the air gaps that naturally form between irregularly-shaped, rounded logs. Foresters estimate that only about 80 cubic feet of that stack is actually solid wood — the "cord (80 ft³)" unit on this page represents that estimated solid-wood content rather than the total space the stack occupies.
What's the difference between a cross tie and a switch tie?
Both are railroad timber-volume units representing one finished tie's worth of wood, but a switch tie is sized for the longer ties used at track switches and junctions, so it represents noticeably more volume than a standard cross tie used along straight track.
Why does the TSF (thousand square feet) unit change depending on panel thickness?
TSF measures a fixed surface area (1,000 square feet) of sheet material like plywood or OSB, but the actual volume of wood in that area obviously depends on how thick the panel is — a 3/4-inch panel contains six times as much wood as a 1/8-inch panel covering the same 1,000 square feet, which is why this page lists a separate TSF unit for each common panel thickness.