Vitamin E is α-tocopherol. The vitamin E activity of foods is usually expressed as α-tocopherol equivalents. Conversion factors are as follows:

Tocopherol Fraction	Conversion Factor for Vitamin E Activity
α-tocopherol	x 1.00
β-tocopherol	x 0.40
γ-tocopherol	x 0.10
δ-tocopherol	x 0.01
α-tocotrienol	x 0.30
β-tocotrienol	x 0.05
γ-tocotrienol	x 0.01

Reference

McCance and Widdowson's The Composition of Foods (6th summary edition). HMSO, 2002