Stock Return Calculator

A stock return calculator measures how much money you actually made on a stock position by combining capital gains (the change in share price) and dividends (cash payouts received while holding). The result, expressed as both a dollar figure and a percentage of your cost basis, is the standard way to evaluate the full economic outcome of a single trade.

The percentage return shown here is the total return on cost — it does not annualize across years. For a multi-year position you'll want to also calculate CAGR or IRR to see the annualized rate. This calculator is most useful for evaluating completed positions, comparing trades, and figuring out tax-relevant numbers like capital gain and total proceeds.

Suppose you bought 50 shares of a stock at $100 each, sold them later at $150 each, and collected $200 in dividends along the way:

• Cost basis: 50 × $100 = $5,000
• Sale proceeds: 50 × $150 = $7,500
• Capital gain: $7,500 − $5,000 = $2,500
• Dividends: $200
• Total return: $2,500 + $200 = $2,700
• % return: $2,700 / $5,000 = 54%

Note how dividends added 4 percentage points — modest in a single trade, but significant if you held for years and reinvested. Over a 20-year holding period, a 2% dividend yield reinvested can almost double the final value compared to price-only return.

• Reviewing closed trades — see what each position actually returned, not just the price chart.
• Tax preparation — separates capital gain (Schedule D) from dividend income (Schedule B) for US filers.
• Comparing strategies — was the high-dividend stock a better trade than the growth stock once everything is included?
• Performance attribution — split your gain into how much came from price appreciation versus dividends.
• Investor education — illustrate to a beginner why dividends shouldn't be ignored in stock picking.

• Forgetting dividends. A stock that traded sideways for 5 years but paid 4% dividends actually returned ~22% — easy to miss if you only look at price.
• Ignoring taxes. A 50% pre-tax return becomes about 42.5% after a 15% long-term capital gains tax. After-tax return is what funds your goals.
• Not annualizing. A 50% total return is excellent in 1 year, average in 5 years, mediocre in 10. Pair this calculator with CAGR for context.
• Skipping commissions and spreads. Even with $0 commissions, bid-ask spreads on small caps can cost 1–2% per round trip.
• Comparing to the wrong benchmark. A single stock's 30% return looks great until you notice the S&P 500 returned 35% in the same period.