Calculating Notional Value and Percentage Return

Welcome back. In the previous lesson, you read prices and volume from a chart. A chart can show where a stock traded, but it does not tell you what your hypothetical trade was worth: for that, you also need the number of shares and your entry and exit prices.

Today you will calculate a stock trade’s notional value and percentage return. These give you two different views of a trade: its size in rupees and its price change relative to the value of the shares at entry.

From a share price to a trade value

Suppose you buy one share at ₹100 and sell it at ₹110. The price difference is ₹10. If you buy 1,000 shares at those same prices, the price difference is still ₹10 per share, but the total gain before costs is ₹10,000.

Watch the opening example in Intraday trading WON'T make you rich from Zero1 by Zerodha. Focus on the distinction between the price change of one share and the gain across all the shares traded.

A position’s notional value is the value of all its shares at a stated price:

For a trade, specify which price you mean. If you buy 50 shares at ₹250 each, their entry notional value is:

If you later sell those 50 shares at ₹257.50 each, their exit value is:

These are the total values at two different prices, not two separate profits. The gross gain is the difference:

You can check it another way: the price rose by ₹7.50 per share, and ₹7.50 multiplied by 50 shares is ₹375. This example assumes all 50 shares were bought and sold at the stated prices. On a chart, seeing a price reach a particular high does not by itself establish that a trade was executed there.

Turn the value change into a percentage

A ₹375 gain tells you how many rupees the hypothetical trade made before costs. To judge the gain relative to the trade’s size, divide it by the entry value.

Watch How to Calculate Stock Profit Percentage from Calculator Club for the calculation using a purchase value and a selling value. Its currency differs from ours, but the arithmetic is identical.

For a fully closed buy-then-sell trade of the same number of shares, the gross percentage return is:

The supplied rate-of-return illustration expresses the same relationship using an original value and a current value. For our completed trade, use the entry value as the original value and the value at the exit price as the ending value.

For the 50-share trade, the calculation is:

You can reach the same percentage directly from the per-share prices:

Why does the quantity disappear from the second calculation? In the first, both the value change and the entry value contain the same factor of 50 shares. That factor cancels when you divide. Quantity changes the rupee gain or loss; it does not change the gross percentage return when entry and exit prices stay the same.

Read losses and returns carefully

The method also works when the exit price is lower. Suppose the 50 shares bought at ₹250 are sold at ₹245. The entry value remains ₹12,500, while the exit value is ₹12,250:

Keep the negative sign: it identifies a loss, not a 2% gain. A useful reasonableness check is to compare the prices first. For a buy-then-sell trade, an exit below entry must produce a negative gross return.

Percentage return and rupee result answer different questions. Consider buying 20 shares at ₹500 and selling them at ₹510. The entry notional value is ₹10,000, the gross gain is ₹200, and the gross return is 2%. Buying 200 shares at those same prices makes the entry notional value ₹100,000 and the gross gain ₹2,000—but the gross return remains 2%. The larger position changes the money at stake, not the stock’s percentage price move.

Two boundaries matter when reporting these figures:

• State the denominator. The 3% calculated earlier is a gross return relative to the ₹12,500 entry notional value. It is not automatically a return on your entire trading account or on any smaller amount a broker might require to place the trade.
• State that it is gross. Brokerage, taxes, and other trading charges can reduce the result. You will calculate those costs in a later module; for now, use the stated prices and share quantity without silently treating the gross figure as take-home profit.

Key takeaways

Multiply price by share quantity to find a position’s notional value at that price. For a completed buy-then-sell trade, subtract entry value from exit value to find the gross rupee result, then divide by entry value to find the gross percentage return. The same percentage can be calculated from per-share prices when the same shares are bought and sold.

Next, you will examine leverage: why controlling a given notional value with less money can make gains and losses much larger relative to the money committed.