How many Rem (base 16px)s are in 1 Em (base 16px)?

There are exactly 1 Rem (base 16px)s in 1 Em (base 16px). This means the conversion factor from Em (base 16px) to Rem (base 16px) is 1.

What is the formula to convert Em (base 16px) to Rem (base 16px)?

The formula to convert Em (base 16px) to Rem (base 16px) is: rem = em × 1. For example, to convert 10 Em (base 16px)s to Rem (base 16px)s, you would multiply 10 by 1.

What are the common uses of Em (base 16px)?

The Em (base 16px) is commonly used in web design, responsive typography.

How do you convert Em (base 16px) to Rem (base 16px)?

To convert Em (base 16px)s to Rem (base 16px)s, multiply by 1 (or divide by 1). Therefore, 1 Em (base 16px) (em) equals 1 Rem (base 16px)s (rem).

Em (base 16px) to Rem (base 16px) Converter

Worked example: converting Em (base 16px) to Rem (base 16px)

Step 1 — start with the formula. rem = em × 1
Step 2 — substitute your figure. 10 em × 1
Step 3 — read the result. 10 em = 10 rem
Step 4 — check it in reverse. em = rem × 1 returns 10 em, which matches the figure you started with.

Typography Converter

6 units available

Decimals:

From

To

1

1 em = 1 rem

Formula:

rem = em × 1

With your value: 1 em = 1 rem

Other Em (base 16px) to Rem (base 16px) conversions

2 em to rem 3 em to rem 4 em to rem 5 em to rem 6 em to rem 7 em to rem 8 em to rem

Em (base 16px) to Rem (base 16px) Conversion Table

Em (base 16px) (em)	Rem (base 16px) (rem)
0.5	0.5
1	1
2	2
5	5
10	10
15	15
20	20
25	25
50	50
100	100
250	250
500	500
1000	1,000

Rem (base 16px) to Em (base 16px) Conversion Table

Rem (base 16px) (rem)	Em (base 16px) (em)
0.5	0.5
1	1
2	2
5	5
10	10
15	15
20	20
25	25
50	50
100	100
250	250
500	500
1000	1,000

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Em (base 16px) (em)

Typography

Conventional value

Based on the PostScript point of exactly 1/72 inch, which CSS also adopts for absolute lengths.

Source: PostScript Language Reference; CSS Values and Units Module Level 4 (absolute lengths)

Adobe Systems / W3C · Reviewed 2026-07-01

Rem (base 16px) (rem)

Typography

Conventional value

Based on the PostScript point of exactly 1/72 inch, which CSS also adopts for absolute lengths.

Source: PostScript Language Reference; CSS Values and Units Module Level 4 (absolute lengths)

Adobe Systems / W3C · Reviewed 2026-07-01

How to Convert Em (base 16px) to Rem (base 16px)

To convert from Em (base 16px) (em) to Rem (base 16px) (rem), multiply the value by 1.

Formula: rem = em × 1

Reverse: em = rem × 1

Step-by-Step Example

Start with your value in Em (base 16px). For example: 5 em
Multiply by the conversion factor: 5 x 1
The result is: 5 rem

Em (base 16px) and Rem (base 16px) Relationship

This calculation facilitates standardized conversion between recognized units of typography. Because 1 em equals 1 rem, these two units represent equivalent physical quantities. Understanding the relationship between Em (base 16px) and Rem (base 16px) is essential for accurate calculations in physics, engineering, commerce, and daily applications.

About Em (base 16px)

The em is a relative unit of measurement in typography, based on the current font size.

Common uses of Em (base 16px): web design, responsive typography.

About Rem (base 16px)

The rem is a non-SI unit of equivalent radiation dose. One rem is equal to 0.01 sievert.

Common uses of Rem (base 16px): radiation safety (US), dosimetry.

Frequently Asked Questions

How many Rem (base 16px)s are in 1 Em (base 16px)?: There are exactly 1 Rem (base 16px)s in 1 Em (base 16px). This means the conversion factor from Em (base 16px) to Rem (base 16px) is 1.
What is the formula to convert Em (base 16px) to Rem (base 16px)?: The formula to convert Em (base 16px) to Rem (base 16px) is: rem = em × 1. For example, to convert 10 Em (base 16px)s to Rem (base 16px)s, you would multiply 10 by 1.
What is a Em (base 16px)?: The em is a relative unit of measurement in typography, based on the current font size.
What is a Rem (base 16px)?: The rem is a non-SI unit of equivalent radiation dose. One rem is equal to 0.01 sievert.
What are the common uses of Em (base 16px)?: The Em (base 16px) is commonly used in web design, responsive typography.