Feet Calculator
Measuring a room for new flooring, planning a lumber purchase, or converting feet to meters? A feet calculator handles all these tasks instantly. Just enter your dimensions and get accurate results in seconds – no manual math needed.
The calculator above combines several measurement tools into one interface. Switch between modes to handle conversion (feet/inches to decimal feet, meters, or total inches), square footage and square meters, cubic feet and cubic meters, and board feet for lumber. Input your numbers and the tool displays the calculated values automatically.
What Is a Feet Calculator?
A feet calculator is an online measurement tool that performs arithmetic and unit conversions involving feet and inches. Instead of juggling fractions and conversion factors, you type in raw dimensions and let the calculator do the work. Whether you need the area of a room, the volume of a moving box, or the board feet in a stack of lumber, a single versatile calculator can give you quick, reliable answers.
The standard foot (ft) equals 12 inches or exactly 0.3048 meters. All modern feet calculators build on that definition, handling the math behind fractions, decimal equivalents, and cross‑unit conversions seamlessly.
How to Use the Feet Calculator for Any Project
A multi‑function feet calculator supports these everyday tasks:
- Convert feet and inches to decimal feet, meters, or total inches.
- Add and subtract measurements in feet and inches – useful for material takeoffs.
- Calculate square feet from length and width for flooring, tile, or paint.
- Determine cubic feet from length, width, and height for shipping, storage, or HVAC ducting.
- Compute board feet from lumber dimensions to estimate wood volume and cost.
Enter your measurements, select the desired calculation mode, and read the result directly. All intermediate steps – carrying inches that total 12 or more, applying conversion factors – happen automatically.
Square Feet Calculation
Square footage measures the area of a flat surface. It is the most common application for a feet calculator in home improvement.
Formula:
Square feet = Length (ft) × Width (ft)
If your measurements include inches, convert them to decimal feet first by dividing the inches by 12 and adding to the feet. For example, 10 ft 6 in becomes 10.5 ft.
Example:
A bedroom measures 12 ft long and 11 ft 6 in wide.
Decimal width = 11 + (6/12) = 11.5 ft
Area = 12 × 11.5 = 138 square ft
The calculator above handles the inch‑to‑decimal conversion automatically, so you can enter feet and inches directly.
Cubic Feet Calculation
Cubic feet are used for volume: shipping boxes, refrigerators, concrete pours, and air flow. A feet calculator simplifies this three‑dimensional product.
Formula:
Cubic feet = Length (ft) × Width (ft) × Height (ft)
Example:
A storage bin is 3 ft long, 2.5 ft wide, and 2 ft tall.
Volume = 3 × 2.5 × 2 = 15 cubic ft
If you’re packing for a move, calculate the volume of each box in cubic feet and sum them to determine the total moving truck space needed.
How Do You Calculate Board Feet?
Board feet is the standard unit for lumber volume in North America. A board foot represents a piece of wood 1 foot long, 1 foot wide, and 1 inch thick (144 cubic inches). The feet calculator applies the board foot formula using your input for thickness, width, and length.
Board foot formula:
Board Feet = (Thickness in inches × Width in inches × Length in feet) ÷ 12
Why divide by 12? Because 1 board foot equals 144 in³, and thickness × width gives square inches, which multiplied by length in feet and then by 12 would give cubic inches. Dividing by 12 avoids that extra step.
Example:
You need 10 boards, each 2 inches thick, 6 inches wide, and 8 feet long.
Board feet per piece = (2 × 6 × 8) ÷ 12 = 96 ÷ 12 = 8 BF
Total for 10 pieces = 80 board feet.
Use this calculation to compare lumber costs or to quote a woodworking project. The calculator’s board foot mode does the math after you enter thickness, width, and length.
Feet to Meters Conversion
International projects or travel often require switching between imperial and metric systems. The feet calculator converts instantly.
Conversion factor: 1 foot = 0.3048 meters
Quick reference:
| Feet | Meters |
|---|---|
| 1 | 0.3048 |
| 2 | 0.6096 |
| 3 | 0.9144 |
| 5 | 1.524 |
| 10 | 3.048 |
| 20 | 6.096 |
| 50 | 15.24 |
For a precise conversion, multiply any foot measurement by 0.3048. The calculator’s length converter outputs meters alongside decimal feet and total inches.
This tool provides estimates for planning purposes only. For structural, safety‑critical, or official calculations, always verify with a qualified professional.