Feet and Inches Calculator

A free tool to perform arithmetic on feet and inches for construction, DIY, and other projects.

Updated: November 2025 • Free Tool

Feet and Inches Calculator

First Measurement

Second Measurement / Scalar

Result

0' 0"

What is a Feet and Inches Calculator?

A Feet and Inches Calculator is a free tool that helps you perform arithmetic with imperial length measurements. It can add, subtract, multiply, and divide feet and inches, making it essential for a wide range of projects.

This calculator is ideal for:

  • Construction & Woodworking - Calculating material lengths, cuts, and layouts.
  • DIY Home Projects - Measuring for furniture, flooring, or renovations.
  • Education - Helping students understand imperial measurements.

To better understand length conversions, check out our Length Converter to convert between various imperial and metric units.

For area calculations, explore our Square Yard Calculator to determine the area of a space in square yards.

To calculate the volume of materials, use our Cubic Yard Calculator to estimate the amount of concrete, gravel, or other materials needed for a project.

How The Calculator Works

The calculator works by converting all measurements to a common base unit (inches) before performing any calculations. Here's the process:

  • Conversion to Inches: Feet are converted to inches (1 foot = 12 inches) and added to the given inches.
  • Calculation: The chosen arithmetic operation is performed on the total inches.
  • Conversion back to Feet and Inches: The result in inches is converted back to feet and inches for the final display.

How to Use This Calculator

1

Enter Measurements

Input the feet and inches for both measurements. For multiplication and division, the second measurement acts as a scalar.

2

Select Operation

Choose to add, subtract, multiply, or divide.

3

Get Results

Click "Calculate" to see the result in feet and inches.

Benefits of Using This Calculator

  • Accuracy: Avoid manual conversion errors and get precise results.
  • Efficiency: Save time on complex calculations, especially for large projects.
Feet and Inches Calculator - Free online tool to calculate lengths with instant results
A professional interface for the Feet and Inches Calculator, showing input fields for feet and inches and operation selection.

Frequently Asked Questions (FAQ)

Q: What is a Feet and Inches Calculator?

A: A Feet and Inches Calculator is a tool that allows you to perform arithmetic operations (addition, subtraction, multiplication, and division) on measurements in feet and inches. It's particularly useful for projects that require precise length calculations, such as in construction, woodworking, and interior design.

Q: How do you add feet and inches?

A: To add feet and inches, you first add the inches. If the sum is 12 or more, you convert the excess inches to feet (by dividing by 12) and add it to the feet column. For example, 5' 7\" + 3' 8\" = 8' 15\". Since 15 inches is 1' 3\", the result is 9' 3\".

Q: How do you subtract feet and inches?

A: To subtract feet and inches, you start with the inches. If the first measurement has fewer inches than the second, you 'borrow' 1 foot (12 inches) from the feet column of the first measurement. For example, to calculate 9' 3\" - 3' 8\", you would convert 9' 3\" to 8' 15\", and then subtract: 8' - 3' = 5' and 15\" - 8\" = 7\", for a result of 5' 7\".

Q: Can I multiply and divide feet and inches?

A: Yes, our calculator supports multiplication and division of feet and inches by a scalar number. This is useful for tasks like calculating the total length of multiple identical pieces or dividing a length into equal parts.