Question: how much to trim hair split ends?
Answer: Cut 0.4–0.8 inches (1.0–2.0 cm) off the ends of the section of hair. Make the cut perpendicular to the strand of hair so that you get an even cut. If you have split ends that go far up the hair shaft, you may have to cut more than 0.8 inches (2.0 cm). Start by cutting off a small amount, just to be safe.