Convert between feet/inches and total inches instantly.
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function calculateToInches() {
var ft = parseFloat(document.getElementById('ft_input').value);
var inch = parseFloat(document.getElementById('in_input').value);
if (isNaN(ft)) ft = 0;
if (isNaN(inch)) inch = 0;
var total = (ft * 12) + inch;
if (total < 0) {
document.getElementById('res_total_inches').innerHTML = "Please enter positive values";
} else {
document.getElementById('res_total_inches').innerHTML = total.toFixed(2) + " inches";
}
}
function calculateToFeetInches() {
var total_in = parseFloat(document.getElementById('total_in_input').value);
if (isNaN(total_in) || total_in < 0) {
document.getElementById('res_ft_in').innerHTML = "Enter a valid number of inches";
return;
}
var ft = Math.floor(total_in / 12);
var remaining_in = total_in % 12;
document.getElementById('res_ft_in').innerHTML = ft + " ft " + remaining_in.toFixed(2) + " in";
}
How to Convert Feet to Inches
Converting feet to inches is a fundamental measurement task used in construction, interior design, and height tracking. The imperial system defines one foot as exactly 12 inches. Therefore, the mathematical formula to convert feet to inches is simple:
Total Inches = (Feet × 12) + Inches
For example, if someone is 5 feet 10 inches tall, you would calculate: (5 × 12) + 10 = 60 + 10 = 70 inches.
Converting Total Inches back to Feet
If you have a total measurement in inches and want to express it in feet and inches (the standard way human height or room dimensions are recorded), follow these steps:
Divide the total number of inches by 12.
The whole number (the quotient) is the number of feet.
The remainder is the number of inches.
Example: You have 80 inches. 80 divided by 12 is 6 with a remainder of 8. Thus, 80 inches is 6 feet 8 inches.
Common Inch to Feet Conversion Table
Inches
Feet & Inches
Decimal Feet
12″
1′ 0″
1.00 ft
24″
2′ 0″
2.00 ft
36″
3′ 0″
3.00 ft
48″
4′ 0″
4.00 ft
60″
5′ 0″
5.00 ft
72″
6′ 0″
6.00 ft
Why Use an Inch Feet Calculator?
Accuracy is paramount in projects where every fraction of an inch counts. Whether you are calculating the square footage of a room, checking if a new sofa will fit through a doorway, or tracking a child's growth, using a digital calculator eliminates manual arithmetic errors. Our tool allows for decimal inputs, making it easy to convert precise measurements like 5.5 inches or 10.25 feet without any guesswork.
Practical Applications
Home Improvement: Measuring floorboards, trim, and crown molding usually requires switching between feet and inches.
Height Tracking: Most medical charts and driver's licenses require height in feet and inches, while some athletic assessments use total inches.
Shipping and Logistics: Courier services often require dimensions in total inches to calculate dimensional weight.
Screen Sizes: While TV sizes are diagonal inches, the space they occupy on a wall is often measured in feet.