Average Down Calculator
Calculate the new average cost per share after buying additional shares at another price.
Last Updated: May 2026Average Down Formula
Example Average Down Calculation
Suppose you own 100 shares at $50 and buy 50 more shares at $40. The combined cost is $7,000 for 150 shares.
The new average cost is $46.67 per share. This lower average cost does not mean the investment risk is lower; it means more capital is now exposed.
- Enter original shares and original purchase price.
- Enter the additional shares and new purchase price.
- Review total shares, total cost, and new average cost.
- Compare the new average cost with the original price.
Average Down Scenario Comparison
The same original position can produce different average costs depending on how many additional shares are purchased and at what price.
| Original Position | New Purchase | Total Shares | New Average Cost |
|---|---|---|---|
| 100 @ $50 | 50 @ $40 | 150 | $46.67 |
| 100 @ $50 | 100 @ $40 | 200 | $45.00 |
| 100 @ $50 | 100 @ $30 | 200 | $40.00 |
How to Interpret the Result
A lower average cost can make the break-even price easier to see, but it also increases position size.
If the stock keeps falling, averaging down can increase total losses despite lowering cost per share.
What This Calculator Does Not Include
This calculator does not include commissions, taxes, wash sale rules, dividends, or changes in company fundamentals.
It should be used for cost basis math only, not as a signal to buy more shares.
How to Use This Calculator
Calculate the new average cost per share after buying additional shares at another price.
- Enter realistic values from your own notes or a sample stock scenario.
- Compare the result with the formula section so the calculation is easy to audit.
- Use the result as an educational reference, not as a buy, sell, or hold signal.
Important Limits
Average Down Calculator does not predict market direction, future returns, liquidity, taxes, slippage, or personal suitability. Real results can differ because prices, fees, tax rules, and order execution may change.
Learn the Concepts Behind the Numbers
After using this calculator, use the learning checks to review whether the underlying stock terms, risk ideas, and market basics are clear.
Educational Review
Last updated: May 2026. StockCalcLab tools are built for financial education and calculation practice only. They do not provide personalized financial, tax, legal, or investment advice.
Average Down FAQ
What does averaging down mean?
Averaging down means buying more shares at a lower price, which can reduce the average cost per share.
Is averaging down always a good idea?
No. It lowers cost basis but increases exposure to the same investment and does not remove market risk.
Does this include commissions?
No. Add commissions into the purchase prices manually if you want the example to reflect those costs.
Can this calculator work for averaging up?
Yes. Enter a new purchase price above the original price to model averaging up.
How do I calculate average cost after buying more shares?
Add the original purchase cost and new purchase cost, then divide by the total number of shares after both purchases.
Does averaging down reduce losses?
It lowers average cost per share, but it does not guarantee a recovery or reduce market risk. The position can still decline further.
Disclaimer: This calculator is for educational cost basis examples only and is not investment advice.