Crypto Cost Basis Calculator

About this calculator

The cost basis of a crypto holding is the average price paid per coin across all your purchases, calculated by dividing total dollars invested by the total number of coins held — this is the reference point every future gain or loss gets measured against. This calculator takes your total invested amount and coins held (across one or many buys, potentially at different prices) and returns your average cost basis per coin.

Knowing your cost basis is essential for tax reporting, since capital gains or losses on a sale are calculated relative to it, and it's equally useful for gut-check decisions — comparing the current market price to your average buy price tells you at a glance whether a position is in profit or underwater, without digging through every individual transaction.