Feet and Inches Calculator: Calculate Measurements Easily
Convert, add, and subtract feet and inches — including fractions — using 1 foot = 12 inches. See total inches, decimal feet, worked examples, and a free calculator.
Measuring length in feet and inches is common in construction, home improvement, interior design, architecture, and everyday measurements. Working with two units at once is where mistakes start — a missed carry of 12 inches, or treating 5.5 feet as 5 ft 5 in instead of 5 ft 6 in.
A Feet and Inches Calculator lets you enter measurements such as 5 ft 8 in or 8 ft 11 in and instantly convert, add, or subtract them. The key relationship is exact: **1 foot = 12 inches**.
Use the free Feet and Inches Calculator on CalcWisee, or the live tool below. For other length units, open the Unit Converter.
Try it right here — results update instantly.
Feet and Inches Calculator
Convert, add, subtract, and show total inches plus decimal feet. 1 ft = 12 in exactly.
Result
5 ft 8 in
68 total inches
Formula: total inches = (feet × 12) + inches. Decimal feet = feet + (inches ÷ 12). 1 in = 2.54 cm exactly.
| Feet and inches | Total inches | Decimal feet |
|---|---|---|
| 1 ft 0 in | 12 in | 1.00 ft |
| 2 ft 0 in | 24 in | 2.00 ft |
| 3 ft 6 in | 42 in | 3.50 ft |
| 4 ft 0 in | 48 in | 4.00 ft |
| 5 ft 0 in | 60 in | 5.00 ft |
| 5 ft 6 in | 66 in | 5.50 ft |
| 5 ft 8 in | 68 in | 5.6667 ft |
| 6 ft 0 in | 72 in | 6.00 ft |
| 6 ft 4 in | 76 in | 6.3333 ft |
| 6 ft 6 in | 78 in | 6.50 ft |
| 7 ft 0 in | 84 in | 7.00 ft |
| 8 ft 0 in | 96 in | 8.00 ft |
| 10 ft 0 in | 120 in | 10.00 ft |
What Is a Feet and Inches Calculator?
A Feet and Inches Calculator is an online measurement tool for imperial length. Instead of converting by hand before every sum, it processes mixed values and returns total inches, feet-and-inches notation, and decimal feet.
- Converting feet and inches to inches
- Converting inches to feet and inches
- Adding feet and inches
- Subtracting feet and inches
- Comparing measurements and total length
- Working with construction dimensions and fractional inches
- Converting imperial measurements toward centimetres and metres
Feet and Inches Conversion Formula
Because 1 foot = 12 inches:
**Total inches = (feet × 12) + inches**
That single formula turns any mixed measurement into one number you can add, subtract, or convert.
Example: 5 feet 8 inches
5 × 12 = 60 inches. Add the remaining 8 inches: 60 + 8 = 68 inches. Therefore **5 ft 8 in = 68 inches**.
How to Use a Feet and Inches Calculator
- 1Enter the number of feet.
- 2Enter the number of inches, plus a fraction if the tape shows one (1/2, 1/4, 1/8, 1/16).
- 3Select the mode: convert to inches, convert from inches, add, subtract, or decimal feet.
- 4Read the result — feet and inches, total inches, decimal feet, centimetres, and metres update together.
Entering feet 6 and inches 4 produces **6 ft 4 in = 76 inches**, because (6 × 12) + 4 = 76.
How to Convert Feet and Inches to Inches
Use **Total inches = (feet × 12) + inches**. For 7 ft 5 in: (7 × 12) + 5 = 84 + 5 = **89 inches**.
Feet and inches to inches conversion table
| Feet and inches | Total inches |
|---|---|
| 1 ft 0 in | 12 in |
| 2 ft 0 in | 24 in |
| 3 ft 6 in | 42 in |
| 4 ft 0 in | 48 in |
| 5 ft 0 in | 60 in |
| 5 ft 6 in | 66 in |
| 5 ft 8 in | 68 in |
| 6 ft 0 in | 72 in |
| 6 ft 4 in | 76 in |
| 6 ft 6 in | 78 in |
| 7 ft 0 in | 84 in |
| 8 ft 0 in | 96 in |
| 10 ft 0 in | 120 in |
How to Convert Inches to Feet and Inches
Divide the total inches by 12. The whole-number portion is feet; the remainder is inches.
Example: 70 inches
70 ÷ 12 = 5 remainder 10. Therefore **70 inches = 5 ft 10 in**. Another common check: 74 inches = 6 ft 2 in.
How to Add Feet and Inches
Convert each length to inches, add, then convert back.
- 5 ft 8 in = 68 inches
- 3 ft 7 in = 43 inches
- 68 + 43 = 111 inches
- 111 ÷ 12 = 9 remainder 3
Therefore **5 ft 8 in + 3 ft 7 in = 9 ft 3 in**.
How to Subtract Feet and Inches
The same path works for differences. 8 ft 6 in = 102 inches and 3 ft 9 in = 45 inches. 102 − 45 = 57 inches = **4 ft 9 in**. If the second length is longer, the calculator reports an error instead of a negative dimension.
Feet to Inches Formula
When a measurement is feet only: **inches = feet × 12**. Example: 8 feet × 12 = **96 inches**. For more unit families, browse Conversion Calculators and the Feet to Inches Calculator.
Inches to Feet Formula
Decimal feet = inches ÷ 12. Example: 90 ÷ 12 = **7.5 feet**. Decimal feet and feet-and-inches notation are different: **7.5 feet = 7 ft 6 in**, not 7 ft 5 in. That distinction matters in construction and engineering.
Feet and Inches vs. Decimal Feet
5 ft 6 in is the same length as 5.5 ft and 66 inches. **Decimal feet = feet + (inches ÷ 12)**. For 5 ft 6 in: 5 + (6 ÷ 12) = 5.5 ft.
| Feet and inches | Decimal feet | Total inches |
|---|---|---|
| 5 ft 0 in | 5.00 ft | 60 in |
| 5 ft 3 in | 5.25 ft | 63 in |
| 5 ft 6 in | 5.50 ft | 66 in |
| 5 ft 8 in | 5.6667 ft | 68 in |
| 5 ft 9 in | 5.75 ft | 69 in |
| 6 ft 0 in | 6.00 ft | 72 in |
| 6 ft 6 in | 6.50 ft | 78 in |
Feet and Inches Fractions
Woodworking and framing often include fractional inches: 5 ft 6 1/2 in, 8 ft 3 1/4 in, 12 ft 7 3/8 in. Convert the fraction by dividing numerator by denominator (1/2 = 0.5), then add it to the whole inches.
5 ft 6 1/2 in = 5 ft 6.5 in. Total inches = (5 × 12) + 6.5 = **66.5 inches**. The calculator includes 1/16 through 15/16 so you do not have to do that division by hand.
Common Feet and Inches Conversions
| Measurement | Inches | Decimal feet |
|---|---|---|
| 4 ft | 48 in | 4.00 ft |
| 5 ft | 60 in | 5.00 ft |
| 5 ft 6 in | 66 in | 5.50 ft |
| 6 ft | 72 in | 6.00 ft |
| 6 ft 2 in | 74 in | 6.17 ft |
| 6 ft 6 in | 78 in | 6.50 ft |
| 7 ft | 84 in | 7.00 ft |
| 8 ft | 96 in | 8.00 ft |
| 9 ft | 108 in | 9.00 ft |
| 10 ft | 120 in | 10.00 ft |
Where Are Feet and Inches Used?
Construction
Builders measure walls, ceiling heights, doors, windows, lumber, flooring, and room dimensions in feet and inches.
Interior design
Designers use the same units for furniture placement, room layouts, cabinets, shelving, and clearances.
Human height
Height is often written as feet and inches. **5 ft 10 in = 70 inches**.
DIY and woodworking
Cuts frequently mix feet, whole inches, and fractions. Converting to total inches before you mark a board reduces mis-cuts.
Feet, Inches, and Metric Measurements
- 1 inch = 2.54 centimetres exactly
- 1 foot = 30.48 centimetres exactly
- 1 foot = 0.3048 metres exactly
Example: 6 feet = 6 × 30.48 = **182.88 cm**. For broader metric and imperial work, use the Unit Converter and the Length Converter. The international foot (0.3048 m) is the factor used here; the older US survey foot differs only at very long survey distances.
Why Use a Feet and Inches Calculator?
- Fewer carry errors when inches reach 12
- Faster work with several dimensions or fractions
- Total inches and decimal feet shown together
- Add and subtract without a separate conversion step
- A clear error when a subtraction would go negative, instead of a silent NaN or infinity
That is useful for builders, engineers, architects, designers, students, and DIY projects.
Frequently Asked Questions
How many inches are in one foot?
There are exactly 12 inches in one international foot.
How do I convert feet and inches to inches?
Multiply the feet by 12 and add the remaining inches: total inches = (feet × 12) + inches. Example: 5 ft 8 in = 68 inches.
How do I convert inches to feet and inches?
Divide the total inches by 12. The whole number is feet and the remainder is inches. Example: 74 inches = 6 ft 2 in, and 70 inches = 5 ft 10 in.
How many inches is 5 feet 6 inches?
(5 × 12) + 6 = 66 inches.
How many inches is 6 feet?
6 feet = 72 inches.
How many feet is 60 inches?
60 inches = 5 feet exactly.
How many feet is 72 inches?
72 inches = 6 feet exactly.
How do you convert feet and inches to decimal feet?
Decimal feet = feet + (inches ÷ 12). Example: 5 ft 9 in = 5 + (9 ÷ 12) = 5.75 ft.
Can feet and inches include fractions?
Yes. Fractions such as 1/2, 1/4, 1/8, and 1/16 inch are common in construction and woodworking. 5 ft 6 1/2 in = 66.5 inches.
How do I add feet and inches?
Convert each measurement to inches, add, then divide by 12. 5 ft 8 in + 3 ft 7 in = 9 ft 3 in.
Related Measurement Calculators on CalcWisee
- Feet and Inches Calculator — convert, add, subtract, fractions, decimal feet
- Unit Converter — length and other measurement families
- Conversion Calculators — full conversions hub
- Length Converter Guide — metric and imperial length explained
- Feet to Inches Calculator — feet-only conversions
- Inches Calculator — inch arithmetic
- CalcWisee homepage — every calculator category
Conclusion
A Feet and Inches Calculator is the quick way to work with imperial length. Remember **1 foot = 12 inches** and **total inches = (feet × 12) + inches**. Whether the job is a wall, a cabinet, a board, or a height, converting through total inches reduces errors.
Run your own numbers in the Feet and Inches Calculator, then continue with the Unit Converter when you need metres, centimetres, or other units. More tools live on the CalcWisee homepage.
Try it yourself
Put this guide into practice with our free tool.
CalcWisee Editorial Team
Calculator development and formula review
CalcWisee is an independent site founded by Ayman. Every calculator is built from a published formula or official definition, tested against hand-worked examples before it goes live, and corrected promptly when a reader reports an issue to ayman@calcwisee.com.
Expertise: Financial mathematics, Health and fitness formulas, Applied mathematics, Unit conversion standards
