Enter multiple purchase lots to compute your weighted average cost per share. Optionally add the current price to see unrealized gain or loss.
Leave blank to compute average cost only
Average cost basis is the mean purchase price across all lots of the same security, weighted by share count. It determines your taxable gain when you sell: proceeds minus average cost times shares sold. Brokerages support several accounting methods — average cost, FIFO, specific lot — and each produces a different taxable amount.
In the US, individual stocks use FIFO by default (first shares bought are the first sold). Mutual funds can use average cost. ETFs default to FIFO but allow specific lot selection. Understanding your average cost still matters for gauging your overall position profitability even if FIFO is used for taxes.
Yes, when you buy during price dips your average cost falls below your first purchase price. The calculator shows this automatically — enter your actual purchase prices and quantities to see the weighted average.
Yes — the calculation is the same regardless of asset class. Enter each buy as a lot with the purchase price (in USD) and quantity (coins/tokens).
Your break-even is simply the average cost — the price at which selling all shares results in zero gain or loss before taxes and fees.