Average Down Calculator

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Frequently Asked Questions

What does averaging down mean in investing?

Averaging down means buying additional shares of a stock you already own at a lower price than your original purchase. This lowers your average cost per share, which reduces the price the stock needs to recover to before your total position is profitable. It is a common strategy when an investor still believes in the long-term thesis but wants to take advantage of a temporary price drop.

How do you calculate the average cost after adding to a position?

Average cost equals total capital invested divided by total shares held. If you bought 100 shares at $50 ($5,000) and then add 100 more at $30 ($3,000), you have 200 shares and $8,000 invested, so your new average cost basis is $40 per share. The calculator does this automatically for any number of additional purchases.

When should you average down on a stock?

Averaging down makes sense only when the fundamental thesis for owning the stock is unchanged and the price drop is due to market noise rather than a broken business model. If the reason you bought the stock is still intact and the position size is still within your risk limits, lowering your cost basis can speed up recovery when the stock eventually rebounds.

What are the risks of averaging down?

The biggest risk is throwing good money after bad. If the stock keeps falling, each additional purchase deepens your loss and concentrates portfolio risk in one position. Never average down without a stop loss on the combined position, and never increase position size beyond what your risk rules allow for a single trade or single stock.

Is averaging down a good strategy?

Averaging down works well for long-term investors buying quality companies at a discount and works poorly for short-term traders riding a broken setup down. The key is discipline: predefine how many times and at what prices you will add, and stop if the thesis breaks. Many pro traders instead use the opposite approach, adding to winners, not losers.

How to Use This Average Down Calculator

This free average down calculator helps you determine the new average cost per share when you buy additional shares of a stock at different prices. Whether you’re averaging down to lower your cost basis or simply want to track your total investment, this tool makes the math effortless.

Step-by-Step Instructions:

  1. Add your first purchase
    Under “Add a Purchase”, enter the number of shares and the price per share of your original buy, then click “Add Purchase”. If you know the dollar amount you put in rather than the share count, switch the toggle from Shares to Dollar Amount and the calculator works out the shares for you.
  2. Add every purchase after that
    Enter the new quantity and price and click “Add Purchase” again. Each buy is listed in the Your Purchases table with its share count, price, cost, and what percentage of your total cost it represents.
  3. Read your cost basis
    The calculator updates as you add each purchase and shows your:
    • Average Cost Per Share
    • Total Shares
    • Total Invested
  4. Enter the current price to see where you stand
    Add the Current Stock Price and three more figures appear: Market Value, Unrealized P&L, and Break-Even Move, which is the percentage the stock has to travel from here to get you back to your average cost.
  5. Work backwards from a target average
    Enter a Target Average and the Buy Price you expect to pay, then click “Solve”. The calculator returns how many more shares you would need at that price to pull your blended average down to your target. The target has to sit between your buy price and your current average, otherwise no share count can reach it.
  6. Reset anytime
    Click “Reset” to clear every purchase and start fresh.

This average down calculator is perfect for stock traders and investors who want to manage their portfolio more effectively by keeping track of their true average purchase price after multiple buy-ins.

Use it to make smarter decisions when adding to a losing position or optimizing your long-term cost basis.

You can check out the rest of our calculators here!

Know When Averaging Down Actually Works

Financial Tech Wiz Trading Journal

Lowering your cost basis feels productive. Whether it pays is an empirical question, and the only way to answer it is to look at your own added-to positions next to the ones you left alone. The journal records every entry and exit and shows your win rate and P&L broken down by symbol and hold duration.

Track Your Positions

Related Free Calculators

Once you know your new average, check what a sale would actually net after fees with the stock profit calculator, and size the next add against a defined stop using the risk reward ratio calculator before you commit more capital to the position. If you want a running record of every buy in one place, the free trading journal template tracks entries, exits, and cost basis in Google Sheets.