How many grays are in one rad?

One rad equals 0.01 Gy. The formula is Gy = rad × 0.01.

How do I convert rads to grays?

Multiply the value in rads by 0.01. For example, 100 × 0.01 = 1 — so 100 rad = 1 Gy.

Pair · linear · factor 0.01

rads to grays

radGy

Active unit

rads · ≈ 1 Gy (base)

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radrad100

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Frequently asked questions

An emerald radiation beam splitting into a precise ray and a scattered cloud over the outline of a human figure, against a cosmic nebula in violet and magenta

Absorbed dose

The gray that heals and kills

A dose of 60 grays aimed at a tumor saves a life. A dose many times smaller, spread across the whole body, kills with no hope of rescue. Same unit — and less energy than a crumb of chocolate carries. This is the thermodynamic paradox of the absorbed dose.

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