2 criterias are needed :

1. R I > R II > R III
2. R I > 15mm
3. R I + S III >25mm
4. R avL > 11mm
5. R avF > 20mm
6. Корнельский критерий R avL + S v3 > 28mm (male) , >20mm(female)
7. R v6 > R v5
8. R v5 or R v6 > R v4
9. R v5 or R v6 > 26mm
10. S v1 or S v2 > 20mm
11. Индекс соколова-лайена = R v5 or R v6 + S v1 > 35mm

Remember , 1 large box on the ECG is 10mm.

Try out some examples here , here and here