Empower Critical Strike Spell

[Zuke]

What would the crit range be for a kukri (off the shelf), if you cast empowered critical strike?

Kurkri = 18 - 20 (range 3)
Critical Stike Double Crit Range = 15-20 (range 6)
Empowered = 1.5 x 2 (double) = 3 therefor thriple crit range (range 9)

New Crit Range = 12 - 20

Is my math good?

Regards,
Zuke

[avr]

Empower Spell multiplies dice rolls or other variables, not purely fixed numbers. So, this doesn't work.

http://www.d20srd.org/srd/feats.htm#empowerSpell

[Zuke]

Thanks I thought I over looked somthing simple.