Skip to content
Unitglide

Rad to Gray

1 rad (dose) = 0.01 gray · 1 Gy = 100 rad

1 rad (dose) = 0.01 gray

How it’s calculated

Gy = rad × 0.01

  • Multiply the value in rad by 0.01.
  • To go back, divide by 0.01 (or multiply by 100).
  • 1 rad = 0.01 Gy · 1 Gy = 100 rad
Show worked solutionFactor, unit cancellation and rounding, step by step

  1. Find the conversion factor

    By definition 1 Gy = 100 rad. Source: NIST SP 811 / Handbook 44; BIPM SI Brochure (9th ed.).

  2. Multiply by the factor written as a fraction

    Put rad in the denominator so it cancels, leaving Gy.

  3. Calculate (unrounded)

  4. Round the answer

    Rounded to 5 significant figures.

Answer: 0.01 Gy

1 rad in other units

Batch convert rad → Gy
Results
  1. 1 rad = 0.01 Gy
  2. 5 rad = 0.05 Gy
  3. 10 rad = 0.1 Gy
  4. 25 rad = 0.25 Gy

Permanent link to this conversion

Advertisement
Ad space reserved · 728×90 / 320×100

Quick examples

  • 1 rad (dose) = 0.01 gray
  • 5 rad = 0.05 gray
  • 10 rad = 0.1 gray
  • 25 rad = 0.25 gray
  • 100 rad = 1 gray

About these units

Rad (dose) (rad)

other

Legacy unit: exactly 0.01 Gy (= 1 cGy).

1 rad = 0.01 Gy

Source: NIST SP 811 / Handbook 44

Gray (Gy)

SI (metric)

1 J/kg of absorbed radiation energy.

Base unit

Source: BIPM SI Brochure (9th ed.)

Rad to gray conversion table

rad (dose) (rad) to gray (Gy)
Rad (rad)Gray (Gy)
0.1 rad0.001 Gy
0.5 rad0.005 Gy
1 rad0.01 Gy
2 rad0.02 Gy
3 rad0.03 Gy
4 rad0.04 Gy
5 rad0.05 Gy
6 rad0.06 Gy
7 rad0.07 Gy
8 rad0.08 Gy
9 rad0.09 Gy
10 rad0.1 Gy
15 rad0.15 Gy
20 rad0.2 Gy
25 rad0.25 Gy
30 rad0.3 Gy
40 rad0.4 Gy
50 rad0.5 Gy
75 rad0.75 Gy
100 rad1 Gy
250 rad2.5 Gy
500 rad5 Gy
1,000 rad10 Gy

Related conversions

Frequently asked questions

How do I convert rad to gray?

Use Gy = rad × 0.01. Multiply the value in rad by 0.01.

How many gray are in 1 rad (dose)?

1 rad (dose) (rad) equals 0.01 gray (Gy).

How many rad are in 1 gray?

1 gray (Gy) equals 100 rad (rad).

What is 10 rad in Gy?

10 rad = 0.1 gray.

What is a rad (dose)?

Legacy unit: exactly 0.01 Gy (= 1 cGy).

What is a gray?

1 J/kg of absorbed radiation energy.

Formula: Gy = rad × 0.01. Factors last reviewed 2026-10-27.