Finding the total percentage gain or loss on a portfolio requires a few simple calculations. First, you should understand how percentage gains or losses are found on an individual security. To find the net gain or loss, subtract the purchase price from the current price and divide the difference by the purchase prices of the asset. For example, if you buy a stock today for $50 and tomorrow it is worth $52, your percentage gain is 4% ( ($52  $50)/$50 ).
Finding the daily return on your portfolio requires a different approach. Because the stocks will usually have different purchase prices, a percentage gain in one security may not be equivalent to an equal percentage gain in another. Simply adding the individual percentage returns will not give an accurate measure of portfolio return. By adjusting the above method of finding a stock's return, you can find the percentage return of a portfolio. Instead of using the purchase price and current value of the stock, you will do your calculations based on the total value of your portfolio. For example, on June 1, your portfolio is valued at $14,500. After a week of market activity, your portfolio value increases to $15,225. Your percentage return on your portfolio for the week is 5% ( ($15,225  $14,500)/$14,500 ).
For more information on evaluating your portfolio, read Equity Portfolio Management Mechanics.

How are my total returns calculated?
My financial planner says my equity portfolio is up year to date after the fee (1.5%) 5 months into the year. Bonds are up ... Read Answer >> 
How do you calculate the percentage gain or loss on an investment?
Calculating the percentage change of your investment is quite easy. All it takes is a little bookkeeping and either a simple ... Read Answer >> 
What kind of stocks should I buy (Ex. Oil, Gold, Consumer, Bio, or Tech)?
How many stocks should be in a buy and hold strategy? At what percentage gain should I start taking real prof... Read Answer >> 
How are capital gains calculated when using an online brokerage account?
Are capital gains calculated annually or on every trade? How can selling a stock at a loss save me money on taxes? Also, ... Read Answer >> 
How do I calculate my portfolio's investment returns and performance?
Learn the basic principles underlying the data and calculations used to perform personal rates of return on investment portfolios. Read Answer >> 
How do I calculate my yeartodate (YTD) return on my portfolio?
Find out how to calculate the yeartodate return of a portfolio, including examples of YTD return calculations with and ... Read Answer >>

Investing
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Calculating the percentage of change in an investment is easy. Take the amount the investment gains and divide it by the amount invested. 
Managing Wealth
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Learn about three simple steps you can use to evaluate the annual performance of your investment portfolio, and why rate of return isn't enough. 
Managing Wealth
The Workings Of Equity Portfolio Management
Achieve analytical efficiency by applying your evaluation to a key set of stocks. 
Managing Wealth
Calculating The Means
Learn more about the different ways you can calculate your portfolio's average return. 
Managing Wealth
Rebalance Your Portfolio To Stay On Track
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Managing Wealth
Achieving Optimal Asset Allocation
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Is Your Portfolio Overweight?
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ETFs & Mutual Funds
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Financial Advisor
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Portfolio Return
The monetary return experienced by a holder of a portfolio. Portfolio ... 
Estimated LongTerm Return
A unit investment trust's estimated return over the life of the ... 
Return
The gain or loss of a security in a particular period. The return ... 
Trading Effect
A measure of performance that examines the difference in returns ... 
Absolute Percentage Growth
An increase in the value of an asset or account expressed in ... 
Modern Portfolio Theory  MPT
A theory on how riskaverse investors can construct portfolios ...