I have board feet and need coverage
Flip the conversion when the tally is already in board feet and you need square feet for that thickness.
Board Feet to Square Feet CalculatorSquare Feet to Board Feet Calculator
Sq Ft to BF — Area to Lumber Volume
Enter the area you need to cover and the board thickness. Thickness in means the board feet out.
sq ft
10100 sq ft1000
Enter the area you need to cover (in square feet).
Thickness is in inches. “4/4” is often treated as 1" for quick estimates.
Result
100.00
BF
Add 10–15% for waste
With 15% waste: 115.00 BF
Formula: 100.00 = 100.00 × 1.00
Already have board feet and need coverage? Use the Board Feet to Square Feet Calculator.
What does this 100 BF mean?
The calculator starts at 100 square feet of 1-inch (4/4) lumber, which is 100 BF. The same 100 square feet at 3/4" flooring is 75 BF. Thickness is what turns area into volume.
Square feet is the face you need to cover. Board feet is how hardwood yards sell volume. If thickness changes, board feet changes even when the room size does not.
Treat this as a planning number, not a ticket. 4/4 is often entered as 1", but many floors are actually 3/4". If the yard lists a different thickness, use that.
Before you treat this as an order:
- Use the thickness on the quote — 4/4 as 1" is a quick estimate; 3/4" flooring is 0.75"
- Add 10–15% if you are buying. The result already shows 15% for you
- If you already have board feet and need coverage, this is the wrong page
Square feet to board feet formula
Board feet equal area times thickness in inches. One board foot is 1 square foot at 1 inch thick.
Board Feet = Square Feet × Thickness (inches)
Thicker boards need more BF to cover the same area. Thinner boards need less.
- 100 sq ft of 3/4" (0.75") lumber: 100 × 0.75 = 75 BF.
- Same 100 sq ft at 4/4 (1"): 100 × 1 = 100 BF.
Square feet to board feet at common thicknesses
Scan a few areas. Tap a row or column to highlight. Use the calculator when your thickness is not in the table.
| Square Feet | 3/4" (0.75") | 1" (4/4) | 1.5" (6/4) | 2" (8/4) |
|---|---|---|---|---|
| 10 sq ft | 7.50BF | 10.00BF | 15.00BF | 20.00BF |
| 25 sq ft | 18.75BF | 25.00BF | 37.50BF | 50.00BF |
| 50 sq ft | 37.50BF | 50.00BF | 75.00BF | 100.00BF |
| 100 sq ft | 75.00BF | 100.00BF | 150.00BF | 200.00BF |
| 200 sq ft | 150.00BF | 200.00BF | 300.00BF | 400.00BF |
| 500 sq ft | 375.00BF | 500.00BF | 750.00BF | 1000.00BF |
Thicker boards need more BF to cover the same area. 3/4" flooring is 0.75, not 1.
Where this number goes wrong
These three mix-ups change the board feet even when the room size stays the same.
!
Entering 1" for 3/4" flooring
100 sq ft at 1" is 100 BF. The same floor at 3/4" is 75 BF. Use the thickness on the quote, not the quarter-name if the yard lists actual size.
!
Treating the raw BF as an order
Cuts, defects, and layout eat material. Add 10–15% when you are buying. Complex patterns can need more.
!
Using this page when you already have board feet
This page turns area into volume. If the tally is already in BF and you need coverage, use the board feet to square feet calculator.
When should you use a different page?
I need to tell the units apart
Square feet is area. Board feet is volume. Linear feet is length. That comparison lives on the vs page.
Board feet vs square feet vs linear feetI have length, not area
A run of boards in linear feet needs thickness and width, not square feet.
Linear Feet to Board Feet Calculator❓
Frequently Asked Questions
Use the thickness on the quote. In this calculator, 4/4 is 1", 5/4 is 1.25", 6/4 is 1.5", and 8/4 is 2". Standard hardwood flooring is often 3/4" — enter 0.75, not 1.
Need the reverse direction?Board Feet to Square Feet Calculator
Disclaimer
This is a planning estimate from the area and thickness you enter. Confirm actual thickness, waste, and quantities with your lumber supplier before you order.
Last updated: 2026-09-04
Sources
- NIST Handbook 130 (2026): board foot as 144 cubic inches — 1" × 12" × 12".
- NIST, Making Sure Lumber Measures Up (2017): nominal size vs the dressed size you measure.