What dividend yield actually measures
Dividend yield measures the annualised cash dividend per share relative to the current share price. It is a price-based income ratio, not a total-return measure. That means it can be useful for screening and comparison, but it does not tell you whether a stock is good value or whether the dividend is sustainable.
This calculator keeps the method explicit by asking for the current share price, the dividend per payment, and the payment frequency. It then annualises the dividend and divides it by the current share price.