Average Buy Price Calculator
Enter every purchase you made and this calculator returns the quantity-weighted average price per coin — the number that actually matters when you compare against the current price.
Enter at least one purchase with a price and a quantity. Your figures stay in your browser — nothing is sent to us.
Why the weighted average matters
A plain average of your purchase prices is misleading when the amounts differ. If you bought 0.01 BTC at 60,000 and 0.5 BTC at 30,000, the simple average of 45,000 is nowhere near reality — the weighted average is close to 30,600 because almost all of your position was bought at the lower price.
Averaging down is not automatically good
Adding to a falling position lowers your average price, but it also increases the amount at risk in a single asset. A lower average only helps if the asset recovers; it does nothing to change the underlying reason for the decline.
Educational tool only — not financial or tax advice.
Frequently Asked Questions
How is average buy price calculated?
Add up what you spent across every purchase, then divide by the total quantity you bought. It is a quantity-weighted average, so a large purchase moves the average more than a small one at the same price.
Is average buy price the same as cost basis?
They are related but not identical. Cost basis for tax purposes may include fees and often depends on the accounting method your jurisdiction requires, such as FIFO. This calculator gives the simple weighted average of the purchases you enter.
Should I include fees?
If you want a truer picture of what you actually paid, enter the price you effectively paid per unit including fees. The calculator itself does not add fees for you.
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