If my stock goes from $150 to $180, what is the % increase?
20% increase: ((180 − 150) ÷ 150) × 100 = (30 ÷ 150) × 100 = 20.
Detailed answer
Percent change is always relative to the starting value. New minus old, divided by old, times 100. Here +30 on a $150 base is 20%. Use Percentage Change with Original = 150 and New = 180. This is return on the entry price, not on margin borrowed.
Relationship context
Investment apps may show dollar gain and percent gain; the percent matches this formula unless they annualize or use a different basis.
Worked example
Percentage Change: Original = 150, New = 180.
Same math as the live tool: Basic Percentage, Percentage Change, Percentage Of, and Value After Change.
Percentage Calculator modes
One page covers four patterns: percent of a total, part-to-whole percent, percent change between two values, and final value after a percent increase or decrease—with recent history on your device.