Add and Subtract Feet and Inches

The Feet and Inches Calculator is designed to simplify arithmetic with imperial length measurements. Instead of manually converting everything to inches, you can use this tool to quickly add or subtract lengths given in feet and inches. It's perfect for anyone working on projects where precise measurements are critical.

Feet and Inches Calculator

Add, subtract, multiply, and divide measurements in feet and inches. This calculator handles mixed units and provides results in feet, inches, and metric conversions (meters and centimeters).

Measurement Inputs

First Measurement

ft
in

Second Measurement

ft
in

Display Options

Formula Reference

Total Inches Conversion:

\( \text{Total Inches} = (\text{Feet} \times 12) + \text{Inches} \)

Convert to Feet and Inches:

\( \text{Feet} = \text{Total Inches} \div 12 \)

\( \text{Inches} = \text{Remainder of Total Inches} \mod 12 \)

Convert to Metric:

\( \text{Meters} = \text{Total Inches} \times 0.0254 \)

\( \text{Centimeters} = \text{Total Inches} \times 2.54 \)

What is the Feet and Inches Calculator?

The Feet and Inches Calculator is a simple and powerful tool that lets you perform basic arithmetic operations — addition, subtraction, multiplication, and division — on measurements expressed in feet and inches. It automatically handles unit conversions, fractional inches, and metric equivalents, giving you accurate and easy-to-read results.

This calculator is especially helpful for tasks involving measurement comparison, construction planning, carpentry, or any project that requires precision in imperial and metric units.

Purpose and Benefits

The calculator eliminates the need for manual conversions between feet, inches, and metric units. It saves time, reduces calculation errors, and ensures accuracy in practical measurements. Whether you’re working on a home renovation, measuring fabric, or creating design layouts, it provides clear and reliable results instantly.

  • Perform quick arithmetic with mixed units.
  • View results in both imperial and metric systems.
  • Customize decimal places and fractional precision.
  • Understand step-by-step calculations for transparency.
  • Useful for construction, interior design, and DIY projects.

How to Use the Calculator

Follow these simple steps to use the calculator effectively:

  1. Select the desired operation (Add, Subtract, Multiply, or Divide).
  2. Enter the first measurement in feet and inches.
  3. Enter the second measurement in feet and inches.
  4. Adjust the display options for decimal places or fractional precision if needed.
  5. Click the Calculate button to see the result.
  6. Review results in different formats — feet & inches, total inches, and metric units.
  7. Optionally, view the calculation steps for better understanding.

Understanding the Results

The calculator displays the final output in multiple formats for clarity:

  • Feet and Inches: The standard imperial format.
  • Total Inches: The complete length expressed in inches.
  • Fractional Format: The result rounded to the selected fraction (e.g., 1/8", 1/16").
  • Metric Conversions: Equivalent values in meters and centimeters.

When is this Calculator Useful?

The Feet and Inches Calculator is ideal for anyone who works with measurements regularly. It simplifies planning and measurement tasks in many areas:

  • Construction: Calculating material lengths and dimensions.
  • Carpentry: Combining or comparing cuts and board sizes.
  • Interior Design: Planning furniture placement and room layouts.
  • DIY Projects: Ensuring precise measurements for home improvement.
  • Education: Teaching conversions and unit relationships.

Formula Breakdown

Here’s how the calculator processes your inputs:

  • Step 1: Convert both measurements into total inches.
  • Step 2: Perform the selected operation (+, −, ×, ÷).
  • Step 3: Convert the result back into feet and inches.
  • Step 4: Display fractional and metric equivalents.

Frequently Asked Questions (FAQ)

Can I use decimal inches?

Yes. You can enter decimal values for inches, such as 5.5 inches, and the calculator will handle them accurately.

What if the inches exceed 12?

The calculator will automatically convert every 12 inches into 1 foot to keep measurements consistent.

How precise are the results?

You can set the number of decimal places or choose a fractional precision like 1/8" or 1/16" for more accuracy.

Is metric conversion included?

Yes. The tool instantly provides equivalent measurements in meters and centimeters alongside your imperial result.

Who can benefit from this calculator?

Anyone dealing with measurements—builders, engineers, designers, students, and DIY enthusiasts—can benefit from its quick and accurate conversions.

Conclusion

The Feet and Inches Calculator makes measurement conversions simple, accurate, and efficient. It bridges imperial and metric systems, helping you calculate and compare dimensions effortlessly. Whether for professional work or personal projects, this tool ensures that your measurements are always consistent and easy to interpret.

More Information

How the Calculator Works:

When adding or subtracting, the calculator handles the conversion between feet and inches automatically.

  • Addition: It adds the inches and feet separately. If the sum of the inches is 12 or more, it converts every 12 inches into an additional foot.
  • Subtraction: If you need to subtract more inches than you have, it "borrows" a foot from the feet column, converting it into 12 inches.

The final result is always presented in a clear "feet and inches" format.

Frequently Asked Questions

How many inches are in a foot?
There are 12 inches in one foot.
How do you add 5' 8" and 3' 6"?
First, add the inches: 8 + 6 = 14 inches. Since 14 inches is 1 foot and 2 inches, you write down 2 inches and carry over 1 foot. Then, add the feet: 5 + 3 + 1 (carried over) = 9 feet. The total is 9' 2".
Can this calculator handle fractions of an inch?
Our current version handles whole numbers, but we are working on adding support for fractions to make it even more useful for precise carpentry work.

About Us

We build practical tools for real-world applications. This calculator was created to help tradespeople and DIYers save time and reduce errors when working with imperial measurements.

Contact Us