This is an approximately conversion chart between gas mark and electric ovens.
Gas Mark
Fahrenheit
Celsius
Description
1/4
225
110
cool/slow
1/2
250
130
–
1
275
140
cool
2
300
150
–
3
325
170
very moderate
4
350
180
moderate
5
375
190
–
6
400
200
moderately hot
7
425
220
hot
8
450
230
–
9
475
240
very hot
This chart should be accurate enough for all your cooking needs, though keep in mind the temperatures will vary between different types, brands, sizes of ovens, in addition to your locations altitude, temperature, humidity, etc.