Feet and Inches Calculator

Combine feet and inches into total inches and metric.

How the Math Works

The Feet and Inches Calculator uses a simple yet powerful formula to convert mixed units into a single measurement: total inches equals feet multiplied by 12 plus the remaining inches. This works because there are exactly 12 inches in one foot, so multiplying the number of feet by 12 converts them entirely into inches. Adding the additional inches gives you the complete length in inches, which can then be converted to other units if needed. For example, 5 feet 7 inches becomes (5 × 12) + 7 = 67 total inches.

Practical Applications

To use this calculator practically, enter the number of feet in the first field and the remaining inches in the second field, then select whether you want to add two measurements together or convert to total inches. This is especially useful for construction projects where you need to sum multiple measurements, or when working with specifications that combine feet and inches. The calculator handles the unit conversion automatically, eliminating manual calculation errors and saving time when working with architectural plans, woodworking projects, or any application requiring precise measurements.

Day-to-Day Use

In everyday life, this calculator helps with practical tasks like measuring furniture for a new room, calculating fabric needed for sewing projects, or determining if a TV will fit in a specific space. Whether you're installing new flooring, setting up a home theater, or following a recipe that uses imperial measurements, quickly converting between feet and inches makes the process smoother and more accurate. It's also handy for understanding height measurements, tracking growth, or working with DIY projects where precise measurements matter.

Worked example

5 ft 9 in → 69 in.

FAQ