Calculator guide
Who this calculator is for
Global stock, ETF, and crypto investors who scale into positions by making multiple purchases at different prices and want to calculate their true cost basis including fees.
Accurately calculate the new average cost per share, the overall break-even price including brokerage fees, and simulate what-if scenarios for averaging down or up.
Formula used
Average Cost Per Share = (Total Investment + Total Fees) / Total Number of Shares. This is the true break-even price.
The calculator keeps the math visible so users can understand what changed when they adjust rate, time, contribution, tax rate or loan amount.
Example: Averaging Down on TSLA
How to get a useful result
For the best estimate, use realistic rates, verify lender or tax assumptions, and run at least one conservative scenario. This makes the page more useful than a bare calculator and helps visitors stay longer because they can compare outcomes instead of leaving after one number.
Frequently asked questions
Stock averaging is the practice of buying shares of the same asset at different prices over time. This results in a blended average cost per share.
Averaging down means buying more shares of a stock you already own at a lower price. This reduces your overall average cost per share.
Averaging up means buying more shares of a stock as the price increases. Investors do this to add capital to winning positions.
It is calculated by taking the total amount of money invested (including fees) and dividing it by the total number of shares owned.
You should only average down if your original investment thesis remains intact and the price drop is due to broader market conditions, not a fundamental failure of the business.
Averaging up is smart when a company consistently beats earnings expectations, breaks out into new highs, and proves its long-term growth story.
Cost basis is the original value or purchase price of an asset for tax purposes. It includes the price of the stock plus any brokerage commissions or fees.
Brokerage fees increase your total cost basis. This means your true break-even price is slightly higher than the average stock price alone.
Profit/Loss = (Current Market Price * Total Shares) - Total Cost Basis.
The biggest mistake is 'catching a falling knife'—averaging down on a dying company just because the stock is cheap, rather than cutting your losses.
Yes, mathematically, buying more shares at a lower price pulls your average cost down, meaning the stock requires less of a rebound for you to break even.
DCA is a strategy where you invest a fixed amount of money at regular intervals (e.g., $500 every month) regardless of the stock's price, removing emotion from investing.
Standard average cost calculations do not factor in dividends. However, if you reinvest dividends (DRIP), those new shares are added to your total share count at the market price on the day they were reinvested.
Only if you have high conviction in the company's fundamentals. If the company is losing market share, it is usually better to sell and invest the capital in a stronger asset.
In the US, if you sell a stock at a loss and buy it back within 30 days, you cannot claim the tax deduction for the loss. It is added to the cost basis of the new shares.
If you buy foreign stocks, currency exchange rate fluctuations can impact your true returns. Even if the stock price remains flat, a weakening home currency can result in gains, or vice versa.
Yes, the mathematical formula for volume-weighted average price (VWAP) works identically for stocks, exchange-traded funds (ETFs), and cryptocurrencies like Bitcoin.
Position sizing is deciding how much capital to allocate to a single stock to manage risk. Many experts recommend keeping individual stocks below 5-10% of your total portfolio.
Simply add up the total dollars spent across all purchases and divide by the total number of shares acquired.
Brokers automatically adjust your cost basis when you buy more shares, reinvest dividends, or if a corporate action like a stock split occurs.