Feet vs Inches: Difference and How to Convert

Feet vs inches comes down to one fact: a foot is 12 inches. That single fact answers most questions about feet versus inches, but the two units are used so differently that it’s worth understanding when each one makes sense.

For background on the unit itself, see the foot entry on Wikipedia.

Feet are the “big picture” unit for height, rooms, and distances of a few meters. Inches are the fine-detail unit for screens, tools, and small objects. Below, we compare them directly and show how to move between the two without a calculator.

Feet vs Inches at a Glance

How the Two Units Are Related

Both belong to the imperial and US customary systems, and both are officially defined through the meter. Since 1959, the international inch has been exactly 2.54 centimeters, and the foot is exactly 12 of those inches.

That is why the conversions are so clean:

• Feet to inches: multiply by 12.
• Inches to feet: divide by 12.

Feet to Inches: Worked Examples

5 feet × 12 = 60 inches. 6 feet × 12 = 72 inches. 2.5 feet × 12 = 30 inches.

For a mixed measurement like 5 feet 8 inches, multiply the feet first, then add the leftover inches: (5 × 12) + 8 = 68 inches.

Inches to Feet: Worked Examples

Go the other way by dividing. 48 inches ÷ 12 = 4 feet. 90 inches ÷ 12 = 7.5 feet, which is 7 feet 6 inches.

To get the feet-and-inches format, divide, keep the whole number as feet, and multiply the remainder by 12. For 70 inches: 70 ÷ 12 = 5 with a remainder of 10, so 70 inches is 5 feet 10 inches.

Quick Reference Chart

When to Use Feet

Pick feet when the numbers would otherwise become unwieldy. A room that is 144 inches wide reads far better as 12 feet. People also describe their height in feet and inches in the US and UK, so “5 ft 10 in” is far more natural than “70 inches” in ordinary conversation.

Building materials follow the same habit. Lumber is often sold in 8-, 10-, or 12-foot lengths, while its cross-section is named in inches, like a 2×4.

When to Use Inches

Inches are better for anything smaller or more precise. Television and monitor sizes are quoted in inches across the world, including in countries that otherwise use metric. Bolt sizes, pipe diameters, and hand-tool dimensions also lean on inches, often with fractions such as 3/8 or 1/2.

A good rule: if the measurement is smaller than a foot, use inches. If it’s several feet or more, use feet, or feet and inches together.

Common Mix-Ups

Writing 5.10 for 5 feet 10 inches. This is the classic error. Since a foot has 12 inches, 5 feet 10 inches is 5.83 feet as a decimal, not 5.10. Convert it properly before doing any calculation.

Forgetting the symbol. A single mark (′) means feet and a double mark (″) means inches. Mixing them changes a measurement by a factor of 12.

Assuming a foot is 10 inches. Metric habits can trick people into treating everything as a base-10 system. Imperial units are not.

Turning Either Unit Into Metric

To reach centimeters, multiply inches by 2.54 or feet by 30.48. For instance, 5 feet is 152.4 cm, and 3 inches is 7.62 cm. For a small worked case, see 3 cm to inches, and for the bigger picture on these two units, our explainers on the foot and the inch go further into their history.

Feet vs Inches: The Short Summary

In short, feet vs inches is a question of scale: 12 inches make one foot, and both belong to the same system. If you remember only one thing about feet vs inches, remember that multiplying feet by 12 always gives inches, and dividing inches by 12 gives feet.

Frequently Asked Questions

How many inches are in a foot?

There are exactly 12 inches in one foot.

Which is bigger, a foot or an inch?

A foot is bigger. It is 12 times the length of an inch.

How many feet are in 100 inches?

100 inches is 8.33 feet, or 8 feet 4 inches.

Is 5 feet the same as 60 inches?

Yes. 5 feet multiplied by 12 equals 60 inches.

Why do people say height in feet and inches?

It is a custom. Feet handle the large part and inches the remainder, which keeps the number short and easy to say aloud, as in “five foot ten”.