Brightness ratio to exposure value

Type a value in × to get it in EV instantly.

Exposure

From To

3.585EV

That's 48× as bright as full moonlight, while a candlelit room is 1.33× brighter. That is about 12 times the light of EV 0.

Convert the other way: EV to ×

What it means

How much light is that?

All values are at ISO 100. Shutter speeds assume f/5.6 and apertures assume 1/60 s, since EV fixes only the combination, not either one alone.

The math

How to convert × to EV

Exposure value is logarithmic: EV = log₂(N² ÷ t) for aperture N and shutter time t, and each step of one either doubles or halves the light. Lux follows as lux = 2.5 × 2^EV at ISO 100.

Example: 12 × = 3.58496 EV.

Every unit

Your exposure in every unit

Tables

× to EV conversion table

× to EV conversion table
×	EV
0.25 ×	-2 EV
1 ×	0 EV
4 ×	2 EV
16 ×	4 EV
64 ×	6 EV
256 ×	8 EV
1,020 ×	9.99435 EV
4,100 ×	12.0014 EV
16,400 ×	14.0014 EV
32,800 ×	15.0014 EV
65,500 ×	15.9992 EV
262,000 ×	17.9992 EV

EV to × conversion table

EV to × conversion table
EV	×
-2 EV	0.25 ×
0 EV	1 ×
2 EV	4 ×
4 EV	16 ×
6 EV	64 ×
8 EV	256 ×
10 EV	1,024 ×
12 EV	4,096 ×
14 EV	16,384 ×
15 EV	32,768 ×
16 EV	65,536 ×
18 EV	262,144 ×

Quick answers

How many EV is 1 ×?: 1 × is 0 EV.
How many EV is 10 ×?: 10 × is 3.32193 EV.
How many EV is 12 ×?: 12 × is 3.58496 EV.

The units

About these units