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 amount, and the payment frequency when you enter a per-payment dividend. It then annualises the dividend and divides it by the current share price.
The result is an indicated yield, not a guarantee. A company can increase, cut, suspend, or pay a special dividend, and the market price can change immediately after you calculate the percentage.