Feet and Inches Calculator

Geometry & trigFreeNo sign-up

To add feet and inches, convert to inches, add, and convert back. 5′ 7½″ + 3′ 8¾″ = 67.5 + 44.75 = 112.25 inches = 9′ 4¼″. The calculator works to the nearest 1/16 inch and shows metric too.

FreeStep by stepFractions of an inch

Operation

Length A

Like 5′ 7 1/2″, 5 ft 7.5 in, 12′ or 30″.

Length B

Try:

Result

9′ 4 1/4″

= 9.35417 ft = 285.115 cm

Feet and inches	9′ 4 1/4″
Inches	112.25 in
Decimal feet	9.3541667 ft
Yards	3.1180556 yd
Centimeters	285.115 cm
Meters	2.85115 m
Millimeters	2,851.15 mm

Show steps

Convert both to inches: 67.5 in and 44.75 in.
Add: 112.25 in.
Convert back: 112.25 in = 9′ 4 1/4″ (12 inches per foot).

How to use the feet and inches calculator

Choose the operation.
Type the lengths: feet with ‘ or ft, inches with ” or in, and fractions like 7 1/2.
Press Calculate to get feet and inches (nearest 1/16″) plus decimal and metric equivalents.

How to add and subtract feet and inches

Convert each length to inches: feet × 12 + inches.
Add or subtract the inches.
Convert back: divide by 12; the quotient is feet and the remainder is inches.

Example: 10′ − 4′ 9″ = 120″ − 57″ = 63″ = 5′ 3″.

Conversions

From	To
1 foot	12 inches = 30.48 cm
1 inch	2.54 cm (exact)
1 yard	3 feet = 0.9144 m
Decimal feet	inches ÷ 12

Fractions of an inch

Tape measures are marked in 1/16″. 0.8″ is 12.8/16, which rounds to 13/16″. Common decimals: ⅛ = 0.125, ¼ = 0.25, ⅜ = 0.375, ½ = 0.5, ⅝ = 0.625, ¾ = 0.75, ⅞ = 0.875.

Feet and inches practice quiz: 10 questions

Test yourself with 10 multiple-choice questions. Choose an answer and press Submit to see if you are right and why. Your score appears at the end.

Frequently asked questions

How do you add feet and inches?

Convert both lengths to inches, add them, then divide by 12: the whole number is feet and the remainder is inches.

How do I type fractions of an inch?

Use a space between the whole number and the fraction, like 7 1/2″, or a decimal like 7.5″.

How precise is the result?

It is exact in decimal inches and rounded to the nearest 1/16 inch in feet-and-inches form, as on a tape measure.

How do I convert feet and inches to centimeters?

Convert to inches and multiply by 2.54. The calculator shows cm, m and mm.

Can I divide a length into equal parts?

Yes. Choose Divide a length by a number, for example 12′ ÷ 5 = 2′ 4 13/16″.

Sources

Related calculators

Browse all calculators

More geometry & trig calculators

Circle CalculatorEnter any one of radius, diameter, circumference or area and instantly get the other three, shown both exactly (in terms of π)…Open →Triangle CalculatorSolve a right triangle from its two legs, or any triangle from its three sides (SSS), to get the missing sides, all angles, area…Open →Special Right Triangles CalculatorFrom one side of a 45-45-90 or 30-60-90 triangle, get all sides in exact radical form and decimals, with a diagram.Open →Area & Perimeter CalculatorChoose a shape, enter its dimensions, and get the area and perimeter (or circumference) with a labeled diagram.Open →Volume CalculatorPick a solid (cube, prism, cylinder, sphere, cone, pyramid) and get its volume with a diagram and the formula steps.Open →Distance & Midpoint CalculatorEnter two points to get the distance (with the formula), the midpoint, and a graph of the segment.Open →

Browse all 354 calculators

Effortless Math Team

5 hours ago

Effortless Math Team

Related to This Article

What people say about "Feet and Inches Calculator: Add, Subtract, Fractions"?

No one replied yet.