Dividend yield, properly examined.
Yield is the most-cited and most-misunderstood number in income investing. The headline ratio — annual dividend over price — tells you nothing about sustainability, growth, or what you actually paid for the stream. This calculator exposes all four numbers a working income investor uses: current yield, yield on cost, payout ratio, and the years required to double income at your assumed growth rate.
Dividend yield calculator
Enter the share price and annual dividend per share. Cost basis, shares held, EPS, and expected growth are optional but unlock additional results.
Why the headline yield is the worst yield to use
If you remember one thing from this page, remember this: the dividend yield printed at the top of every brokerage screen — current annual dividend divided by current share price — is a snapshot of the past divided by a snapshot of the present. It tells you what investors who buy today, at today’s price, will receive over the next twelve months if the company maintains the dividend. The conditional clause is doing nearly all of the work, and the yield itself contains no information about whether the condition will hold.
A 9 % yield on a stock that cuts its dividend by 60 % three months later was never a 9 % yield in any meaningful sense. A 2.5 % yield on a company growing dividends 12 % per year produces more dollars of income over a decade than a 6 % yield on a frozen payer. The headline number is a starting point for analysis, not a result of analysis. Income investors who treat it as a result tend to overweight high-yield stocks, underweight high-growth-low-yield stocks, and end up with portfolios that pay handsomely until they don’t.
The four numbers that actually matter
An income-equity portfolio should be evaluated on four ratios, not one:
1. Current yield
Annual dividend per share divided by current share price. The benchmark every other ratio is measured against. Useful for comparing across stocks at a single point in time. Useless for comparing what your own portfolio earns versus what it cost you.
2. Yield on cost
Annual dividend per share divided by your cost basis per share. The number that tells you what your own position yields. A stock you bought at £15 in 2014 that now pays a £1.20 dividend yields 8 % on cost regardless of where the share price has gone. For long-term holders, yield on cost typically diverges substantially from current yield over time and is the better measure of accumulated income performance.
3. Payout ratio
Annual dividend per share divided by earnings per share. The single best indicator of dividend sustainability. A payout ratio above 80 % suggests the dividend is consuming most of earnings and has little buffer for a downturn; below 40 % suggests substantial coverage and capacity for future increases. The payout ratio page covers the diagnostic in depth, including the cash-flow variant that fixes the GAAP-earnings distortion.
4. Dividend growth rate
The compound annual growth rate of dividends per share over the trailing five or ten years, projected forward as a working assumption. Combined with current yield, it determines how quickly your income compounds. The dividend growth page works through the calculation and the diagnostic for distinguishing genuine compounders from cyclical bouncers.
The yield-on-cost case study
Suppose you bought 200 shares of a UK dividend-paying utility in 2014 at £7.50 per share, total cost £1,500. The dividend in 2014 was £0.40 per share, an initial yield of 5.3 %. Today, the dividend has grown to £0.78 per share. The share price is £9.20. The current yield is £0.78 / £9.20 = 8.5 %, but your yield on cost is £0.78 / £7.50 = 10.4 %. Your £1,500 outlay generates £156 of annual income, a 10.4 % effective yield on the original capital, regardless of mark-to-market price.
The case for yield on cost is straightforward: it measures what your portfolio actually earns relative to what you paid. The case against is also straightforward: yield on cost can mask an underlying problem. If the stock has cut its dividend twice over the holding period and the share price has dropped 50 %, your yield on cost may still look healthy because cost basis is fixed, but the position itself is a disappointment. Yield on cost should be paired with absolute dividend-per-share trajectory, not used in isolation.
The payout ratio diagnostic
A company with a 95 % payout ratio is paying out nearly every penny of earnings as dividends. A modest earnings decline forces a dividend cut. A 35 % payout ratio leaves substantial reinvestment capacity and substantial buffer; the dividend is comfortably covered and likely to grow. The threshold to watch differs by industry: utilities and REITs run higher payout ratios as a structural feature; consumer staples, technology, and industrials run lower. A 75 % payout for a utility is normal; a 75 % payout for a software company is alarming.
The earnings-based payout ratio has a known weakness: GAAP earnings include non-cash charges (depreciation, amortisation, write-downs) that don’t affect the dividend-paying capacity of the business. The cash-flow payout ratio — dividends paid divided by free cash flow — is the more rigorous version. Most US REITs and infrastructure businesses report payout ratios on a free-cash-flow or AFFO basis precisely for this reason.
The aristocrat vs. yield-trap distinction
A “dividend aristocrat” in S&P 500 parlance is a member of the index that has raised its dividend annually for at least 25 consecutive years. The criterion is mechanical and superficial — a company can technically maintain aristocrat status with a token annual increase — but the membership list is a useful starting universe for income investors because it filters for businesses that have prioritised dividend continuity through multiple business cycles.
A “yield trap” is the opposite: a stock whose headline yield is high precisely because the share price has fallen on legitimate concerns about earnings sustainability or business viability. The market has, in effect, already priced in a probability of dividend cut; the high yield is not a free lunch but a risk premium. Distinguishing the two requires looking at payout ratio, cash-flow trajectory, and balance-sheet health, not at the yield in isolation. The aristocrats and yield traps page walks through the diagnostic.
Reinvestment and the compound machine
A dividend reinvestment plan (DRIP) automatically reinvests cash distributions into additional shares of the paying company, typically without commission. The mathematics: if a stock yields 4 % and grows dividends 6 % per year, reinvested dividends compound the position at approximately 10 % (yield + growth) before any share-price appreciation. Over a 30-year horizon, reinvested dividends typically account for the majority of total return on a dividend-paying equity portfolio — a stylised fact documented in Robert Arnott’s and Peter Bernstein’s long-run total-return decompositions.
The case against DRIP for already-retired investors is that it converts spendable cash into reinvested capital; if the income is needed for living expenses, DRIP is the wrong default. The case against DRIP for tax-aware accumulators is more subtle: the reinvestment occurs at whatever the price is on the dividend date, with no opportunity to time-weight the entry; over long horizons this averages out, but in the short run it can mean buying at unfavourable prices. The DRIP page works through the mechanics and the cases for and against.
The years-to-double calculation
The rule of 72 applied to dividend growth gives a quick estimate of how long it takes income to double at a given growth rate. A 6 % dividend growth rate doubles income in roughly 12 years (72/6 = 12). An 8 % growth rate doubles in 9 years. The calculator above uses the precise logarithmic version (ln 2 / ln(1+g)) rather than the rule-of-72 approximation, but the intuition is identical. For a 30-year holder of a 6 %-growth stock, dividend income doubles roughly 2.5 times — the original yield, multiplied by a factor of 5.7, which is what makes long-horizon dividend-growth investing such a powerful compounding engine when the growth assumption holds.
Methodology and editorial standards
Calculations follow the standard CFA Institute conventions for dividend yield, yield on cost, and payout ratio. The free-cash-flow payout ratio variant is described in the AICPA Financial Reporting Framework and the CFA Level II curriculum on equity valuation. Dividend growth rates use the standard CAGR formula, not arithmetic-mean approximations. Reviewer credentials are verifiable on the CFA Institute member directory and the ICAEW (FCA) member registry. Calculation discrepancies are corrected within five business days where reproducible — see the contact page. Editorial corrections are timestamped and an audit trail is retained.