Feet and Inches Calculator
Add, subtract, multiply, and divide measurements in feet and inches with fractions
Feet and Inches Calculations
First Value
Examples: 3/4, 1+1/2, 2.5, 5+3/8
Operation
Add two measurements
Second Value
Examples: 1/4, 3+5/16, 11.25, 7/8
Fraction Precision
Choose the smallest fraction to display in results
Calculation Result
Example Calculations
Addition Example
Problem: 2 ft 3 in + 5 ft 6 in
Steps:
• Add feet: 2 + 5 = 7 ft
• Add inches: 3 + 6 = 9 in
Result: 7 ft 9 in
Fraction Addition
Problem: 2 ft 10 1/4 in + 1 ft 2 9/16 in
Steps:
• Add feet: 2 + 1 = 3 ft
• Add inches: 10 + 2 = 12 in = 1 ft (total 4 ft)
• Add fractions: 1/4 + 9/16 = 4/16 + 9/16 = 13/16 in
Result: 4 ft 13/16 in
Area Calculation
Problem: 4 ft 3/8 in × 2 ft
Steps:
• Convert to inches: 4 ft = 48 in, 3/8 = 0.375 in
• Total: 48.375 in × 24 in = 1,161 in²
Result: 1,161 in² (8.06 ft²)
Input Formats Supported
Decimals
Fractions
Mixed Numbers
Expressions
Operation Results
Addition
Result in feet and inches
Subtraction
Result in feet and inches
Multiplication
Area in square units
Division
Unitless ratio
Quick Reference
Understanding Feet and Inches Calculations
Working with Mixed Units
Feet and inches calculations require careful handling of the 12-inch conversion factor. Our calculator automatically manages overflow when inches exceed 12, converting them to additional feet.
Fraction Support
- •Enter fractions as 1/4, 3/8, 5/16, etc.
- •Use mixed numbers like 2+3/4 for 2¾ inches
- •Results automatically simplify to chosen precision
- •Supports common construction fractions
Calculation Methods
Addition/Subtraction
Convert both values to total inches, perform operation, then convert back to feet and inches.
Multiplication
Results in area (square inches and square feet). Useful for calculating room areas or material needs.
Division
Produces unitless ratios. Useful for scaling or proportion calculations.
Precision Control
Choose your precision level from 1/2 inch down to 1/64 inch. The calculator rounds results to the nearest fraction for practical use in construction and woodworking.
💡 Pro Tips
Construction: Use 1/16" precision for framing and finish work
Rough Work: Use 1/4" or 1/8" precision for general measurements
Area Calculations: Multiply length × width for room areas
Material Estimates: Add 10% waste factor to calculated areas