Average Down Calculator
Averaging down is the trade almost everyone makes and almost nobody prices honestly. The weighted average is easy; the part that gets forgotten is the fee loaded onto every buy order, which quietly lifts the break-even above the average you see in your head. This calculator weights every lot into one cost figure, adds the fees to show the all-in break-even per share, marks the position to today's price for unrealized P/L, and lists the exact prices required to clear average cost at +5%, +10%, +20% and +50%. It is arithmetic, not a signal: the calculator tells you where you stand, not whether averaging down is wise in your situation.
The short answer
Buying 100 shares at $10 and 200 at $8 puts your average cost at $8.67 — 300 shares for $2,600. Fees move the all-in break-even to $8.67 per share. The calculator also lists the prices required for +5%, +10%, +20% and +50% gains on total cost.
Unrealized P/L
$98.00
3.77% on total cost.
- Average cost (shares only)
- $8.67
- Average cost incl. fees
- $8.67
- Market value now
- $2,700.00
- Price for +5%
- $9.11
- Price for +10%
- $9.54
- Price for +20%
- $10.41
- Price for +50%
- $13.01
300 shares, $2,602.00 all-in.
At $9.00 per share.
Needed to clear average cost incl. fees at this gain.
Needed to clear average cost incl. fees at this gain.
Needed to clear average cost incl. fees at this gain.
Needed to clear average cost incl. fees at this gain.
How to use Average Down Calculator
- 1
Enter each buy
Price and shares per lot. Use the price actually filled, not the order you wanted — slippage changes the average.
- 2
Add the fee per buy order
A flat commission per trade. Two orders at $1 each means $2 of fees the headline average ignores.
- 3
Enter the current price
The calculator marks the position to market and lists the prices required for each target gain on total cost.
Why use this tool
- Weighted average across any mix of buy lots, not just two equal ones
- All-in break-even per share with per-order fees included
- Unrealized P/L in dollars and percent at the current price
- Target-price table: what the stock must reach for +5% to +50% on cost
- Runs entirely in your browser — lot prices never leave the page
Frequently asked questions
- How do I calculate my average stock price after multiple buys?
- Multiply each lot's price by its shares, sum those amounts, and divide by total shares: 100 shares at $10 plus 200 at $8 is $2,600 across 300 shares, or $8.67 average. Fees belong in the cost, not the price — the all-in figure is $8.67 per share with $1 fees per order.
- Does averaging down lower my break-even?
- It lowers your average cost, and the break-even is that average plus fees. Whether lowering it is wise depends on why the price fell — the arithmetic is indifferent to the story. Decide the thesis first; this calculator only prices the position you already decided to hold.
- What price do I need to break even after fees?
- Total cost including fees divided by total shares. With $2,602 all-in across 300 shares, break-even is $8.67 — a penny above the fee-free average, and more if you also pay an exit commission.
- Is this financial advice?
- No. This is arithmetic on numbers you enter, for general information. Whether to add to a losing position depends on your thesis, tax situation and risk tolerance — consult a licensed advisor for advice.
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