Enter your current holding and each new purchase. This stock average calculator shows your new average price, total cost and the share price you need to break even.
Stock Average Calculator
Works for shares, ETFs, mutual fund units or anything you buy in several lots.
New purchases
Average price is a weighted average: total money invested divided by total quantity. Brokerage and taxes are not included.
Your result in detail
| Item | Value |
|---|
How many shares to reach a target average?
Uses your existing holding above. Enter the average you want and the price you would buy at.
Illustrative calculation only. Buying more of a falling stock adds risk, and an average price is not a prediction.
You own 100 shares bought at ₹500, and the price has slipped to ₹420. Buying 100 more at ₹400 pulls your average down to ₹450, so you need a rise of about 7.1% to break even instead of 19.0%. A stock average calculator shows that effect before you place the order.
How do you use this stock average calculator in 3 steps?
- Enter the shares you already hold and your average buy price. Leave the quantity at zero if you are starting fresh.
- Add each new purchase with its price and quantity, using Add another purchase for more lots.
- Enter the current market price if you like, then read the new average price, the unrealised profit or loss and the break-even rise.
Stock Charcha shows the rise you needed before and after the purchase, so the benefit of averaging is visible instead of assumed. Use Copy result to save a summary.
How does the stock average calculator work out the average price?
It uses a weighted average. That means total money invested divided by total shares, not the plain average of the prices.
Average price = (Old shares × Old price + New shares × New price) ÷ Total shares
The difference matters when the lots are unequal. Buying 100 shares at ₹500 and 300 at ₹400 gives an average of ₹425, not the ₹450 you would get by averaging the two prices.
What does a worked example look like?
Take 100 shares held at ₹500, plus a new purchase of 100 shares at ₹400, with the market price at ₹420. These figures are illustrative.
| Item | Value |
|---|---|
| Total quantity | 200 shares |
| Total invested | ₹90,000 |
| New average price | ₹450.00 |
| Value at ₹420 | ₹84,000 |
| Unrealised loss | ₹6,000 (6.67%) |
The loss is still real, but the break-even price has moved from ₹500 to ₹450. Averaging changes where you break even, not whether the stock recovers.
How much does averaging down lower the break-even?
Here is the same example before and after the extra purchase, with the market price at ₹420.
| Measure | Before | After |
|---|---|---|
| Average price | ₹500.00 | ₹450.00 |
| Rise needed to break even | 19.05% | 7.14% |
| Money at risk | ₹50,000 | ₹90,000 |
The break-even rise drops sharply, but the money at risk rises from ₹50,000 to ₹90,000. That trade-off is the real decision.
How many shares do you need to buy to reach a target average?
The widget also works backwards. To reach a target average, use this formula with your existing holding.
Shares to buy = Old shares × (Target − Old price) ÷ (Buy price − Target)
With 100 shares at ₹500, buying at ₹400 and aiming for ₹440 means about 150 shares, or ₹60,000. The table shows how the cost climbs as the target gets closer to the buy price.
| Target average | Shares to buy at ₹400 | Cost |
|---|---|---|
| ₹475 | 34 | ₹13,600 |
| ₹450 | 100 | ₹40,000 |
| ₹425 | 300 | ₹1,20,000 |
| ₹410 | 900 | ₹3,60,000 |
Pulling the average to ₹410, just ₹10 above the buy price, costs about ₹3,60,000 in new money. That is more than seven times the original ₹50,000, so the last few rupees of average are the most expensive.
When does averaging down go wrong?
A lower average makes the numbers look better, but it does not make the company better. If the reason for the fall is a weaker business, adding money only raises the loss when the price keeps falling.
Averaging up works the other way: buying at a higher price lifts your average and your break-even. Decide on the strength of the business and your risk limit, and use this stock average calculator to see the cost, not to justify the purchase. Investments in the securities market are subject to market risks. Read all related documents carefully before investing.
What does this stock average calculator leave out?
It does not include brokerage, STT, stamp duty or other charges. Stock Charcha’s brokerage calculator adds them up for a trade. Taxes on any sale are also left out, so check the rules on the Income Tax Department website before you sell.
Splits, bonus issues and rights issues change both your quantity and your price. Use the adjusted figures from your holdings statement, and check corporate actions on NSE. At Stock Charcha we keep this tool to the average itself so the maths stays easy to verify.
Where should you go after using the stock average calculator?
Measure the return on your holding with the CAGR calculator, or use the XIRR calculator when you bought in several lots. If you prefer staged buying, see the SIP vs lumpsum calculator.
Read about the top investing mistakes to avoid and the steps to start investing in the stock market. The Charcha Knowledge Hub collects the basics. Keep your holdings statement beside you and let the stock average calculator do the sums.
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Last updated: 3 October 2026. This page uses no rates, slabs or charges, so the maths stays the same until the method changes.
Founder of Stock Charcha. Stock market enthusiast, actively investing since November 2022. About the author
Educational content only. This page is not personalised financial advice, and nothing here is a recommendation to buy or sell any stock. Please do your own research or speak to a SEBI-registered adviser before investing, and read our disclaimer.
Frequently asked questions
Is the average price the same as the average of my buy prices?
No. The average price is weighted by quantity, so a lot of 300 shares counts three times as much as a lot of 100. Total money invested divided by total shares is the right figure, and the calculator does that for you.
Does averaging down reduce my loss?
It lowers your break-even price, but it also puts more money into the same stock. If the price keeps falling, the loss on the new shares adds to the old loss. Decide with the business in mind, not only the average.
Should I include brokerage in my average price?
Many investors do, because charges are part of the real cost. The calculator leaves them out, so add them yourself by entering the price per share including charges. Your contract note shows the exact amounts.
What happens to my average price after a split or bonus?
Your broker adjusts both quantity and price, and the total invested stays the same. Enter the adjusted quantity and adjusted average price from your holdings statement, not the old figures, before using the stock average calculator.
Can I use this for mutual funds or ETFs?
Yes. The maths works for anything bought in units. Enter the NAV or price you paid as the buy price and the units as the quantity. For SIPs with many dates, the XIRR calculator gives a better return figure.