Gray to Sievert Converter

Radiation Converter

10 units available

Decimals:

From

To

1

1 Gy = 1 Sv

Formula:

Sv = Gy × 1

With your value: 1 Gy = 1 Sv

Other Gray to Sievert conversions

2 Gy to Sv 3 Gy to Sv 4 Gy to Sv 5 Gy to Sv 6 Gy to Sv 7 Gy to Sv 8 Gy to Sv

Gray to Sievert Conversion Table

Gray (Gy)	Sievert (Sv)
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

Sievert to Gray Conversion Table

Sievert (Sv)	Gray (Gy)
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.

Gray (Gy)

Radiation

Exact conversion

Gray and sievert are coherent SI units (J/kg). Rad and rem are exactly 0.01 Gy and 0.01 Sv; the curie is exactly 3.7 × 10¹⁰ Bq.

Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)

Bureau International des Poids et Mesures · Reviewed 2026-07-01

Sievert (Sv)

Radiation

Exact conversion

Gray and sievert are coherent SI units (J/kg). Rad and rem are exactly 0.01 Gy and 0.01 Sv; the curie is exactly 3.7 × 10¹⁰ Bq.

Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)

Bureau International des Poids et Mesures · Reviewed 2026-07-01

How to Convert Gray to Sievert

To convert from Gray (Gy) to Sievert (Sv), multiply the value by 1.

Formula: Sv = Gy × 1

Reverse: Gy = Sv × 1

Step-by-Step Example

Start with your value in Gray. For example: 5 Gy
Multiply by the conversion factor: 5 x 1
The result is: 5 Sv

About Gray

The gray (Gy) is the SI unit of absorbed radiation dose. It measures the amount of energy deposited in a mass of matter by ionizing radiation.

Common uses: medicine, nuclear physics, radiotherapy.

About Sievert

The sievert (Sv) is the SI unit of equivalent radiation dose, which accounts for the biological effect of ionizing radiation on human tissue.

Fun Fact: A typical dental X-ray is about 0.005 millisieverts.

Common uses: radiation safety, medicine, environmental monitoring.

Frequently Asked Questions

How many Sievert are in 1 Gray?

There are exactly 1 Sievert in 1 Gray. This means the conversion factor from Gray to Sievert is 1.

What is the formula to convert Gray to Sievert?

The formula to convert Gray to Sievert is: Sv = Gy × 1. For example, to convert 10 Gray to Sievert, you would multiply 10 by 1.

What is a Gray?