The Capital Gains Yield Calculator measures an investment’s percentage change in price from purchase to its current value. Enter the two prices to see both the dollar gain or loss and the capital gains yield. The result reflects price appreciation or depreciation only—not dividends, interest, taxes, or fees.
How to use the capital gains yield calculator
- Enter the Purchase Price: the original price paid for the investment. Use a value greater than zero, since the percentage calculation divides by this amount.
- Enter the Current Price: the investment’s present market price. To evaluate a completed sale, use the sale price in this field.
- Read the results: Capital Gains shows the dollar difference between the prices, while Capital Gains Yield expresses that difference as a percentage of the purchase price.
Keep both inputs on the same basis. For a stock, enter the purchase price per share and current price per share; the dollar result will then be the gain or loss per share. You can also compare total purchase cost with total current value, provided both amounts represent the same unchanged holding. Do not mix a per-share price with a total investment value.
What is capital gains yield?
Capital gains yield, sometimes called price appreciation yield, is the percentage increase or decrease in an investment’s price relative to its purchase price. A positive result means the price has risen; a negative result means it has fallen.
Unlike total return, capital gains yield excludes income received while you hold the investment. For example, a stock’s price could remain unchanged while it pays dividends. Its capital gains yield would be 0%, even though the investor received income.
Capital gains yield formula
The calculator uses these two formulas:
Capital Gains = Current Price − Purchase Price
Capital Gains Yield (%) = (Current Price − Purchase Price) ÷ Purchase Price × 100
The purchase price is the denominator because the calculation measures the price change relative to your starting investment. Dividing by the current price instead would answer a different question.
Worked example: a stock rises from $50 to $75
Suppose you bought a share for $50 and it now trades at $75:
- Capital Gains: $75 − $50 = $25 per share.
- Capital Gains Yield: ($75 − $50) ÷ $50 × 100 = 50%.
The share price has increased by 50% since purchase. If you still own the share, the $25 gain is unrealized: it represents a change in market value, not cash received from a sale.
How to interpret your result
| Purchase price | Current price | Capital gains | Capital gains yield | Meaning |
|---|---|---|---|---|
| $50 | $75 | $25 | 50% | The price increased by half of the purchase price. |
| $50 | $50 | $0 | 0% | The price is unchanged. |
| $50 | $40 | −$10 | −20% | The price declined by one-fifth of the purchase price. |
A larger positive percentage indicates greater price appreciation relative to the starting price. It does not, by itself, show that an investment is less risky, attractively priced today, or likely to keep rising.
Losses and recovery percentages are not symmetrical. After a decline from $50 to $40, the loss is 20%, but returning from $40 to $50 requires a 25% increase because the new starting price is lower.
Using the result in investment analysis
- Review price performance: compare how much different holdings have appreciated over the same dates. This describes past performance, not future growth potential.
- Estimate gains before selling: use the current market price to estimate the price-only gain or loss. Your actual sale price may differ.
- Separate growth from income: identify whether an investment’s return came from a rising price, cash distributions, or both.
- Compare dollar and percentage gains: a higher dollar gain may simply reflect a larger starting investment. The percentage result puts the price change in proportion.
What the calculator does not account for
- Holding period: the result is not annualized. A 20% gain over one year and a 20% gain over five years produce the same output, but represent different rates of growth.
- Dividends and interest: these require a broader return calculation. Reinvested distributions also need separate treatment.
- Taxes, fees, and inflation: the result is a nominal price change, not an after-tax profit or purchasing-power gain.
- Multiple purchases: one purchase price does not track separate lots bought at different prices or dates. Establish an appropriate comparison basis before entering an aggregate value.
- Stock splits: use prices adjusted to the same share basis. A split changes the share count and quoted price without necessarily changing the holding’s total value.
This is not a capital gains tax calculator. Taxable gains may depend on adjusted cost basis, transaction costs, tax rules, and which shares were sold.
Related calculators for a fuller return picture
- Dividend Calculator: explore dividend income separately from price appreciation.
- Holding Period Return Calculator: evaluate stock returns that include both capital gains and dividends.
- Investment Return Calculator: assess return on investment when a price-only comparison is not enough.
- Inflation Calculator: put nominal gains in context by examining changes in purchasing power.
Build a return calculator for your website
Financial education sites and investment businesses can use Calcopolis to build a customized investment return calculator with assumptions relevant to their audience, such as fees or holding periods. Visitors can explore estimates before requesting a consultation.