Average Entry Calculator
Average entry price calculator
Total units
Total cost
Average entry
Unrealised P/L
The average is weighted by units, not by the number of buys — a large purchase moves it far more than a small one. Leave a row at zero to skip it. Averaging down lowers your break-even price but raises the amount you have at stake, which are two different things and only one of them is comfortable. Fees and tax are not modelled. Runs entirely in your browser. Not advice.
What this calculator does
It combines up to four purchases of the same asset into a single average entry price, weighted by size, and — if you give it a current price — shows the unrealised profit or loss on the combined position.
Weighted, not averaged
The common mistake is to average the prices. If you bought once at $60,000 and once at $45,000, the average of those two numbers is $52,500 — but that is only your entry if you bought the same number of units both times. Buy 0.1 units at $60,000 and 1 unit at $45,000 and your real average is about $46,364, because the larger purchase dominates. This calculator weights by units, which is the only version that is true.
What averaging down does and does not do
Buying more of a falling asset lowers your average entry, and therefore lowers the price at which you return to break even. That is real and it is the whole appeal. What it also does, in the same movement, is increase the amount of money you have exposed to the thing that has been going down. Those are two separate consequences of one action, and only the first one feels good.
Neither outcome tells you whether the second purchase was a good idea. A lower average on a position that keeps falling is a larger loss, not a smaller one. The arithmetic here is honest about the break-even price and silent on the decision, deliberately.
What it does not model
Trading fees, spread, and any tax consequence are not included, so your true cost basis is slightly higher than shown. Tax rules on cost basis vary by jurisdiction and some require a specific method — FIFO, LIFO or an average — that may not match this calculation. If the number matters for a tax return, check which method applies to you.
Frequently asked questions
Can I use fewer than four buys? Yes. Leave the unused rows at zero and they are skipped.
Should I enter dollar amounts or units? Units, together with the price you paid per unit. If you only know the dollar amount, divide it by the price you paid.
Is the average entry my break-even price? Before fees, yes. After fees it sits slightly higher — our break-even calculator handles that part.
Is this advice? No. See our disclaimer.