CostBasis Calc
Add your crypto buys and sells — the app instantly shows your average cost basis, total invested, and realized gains and losses per coin. No account needed, everything stays in your browser.
No account needed · Your data never leaves your browser
Save & manage
Saved only in this browser — no accountCSV format
Plain text file, one transaction per line, commas separating fields — coin,amount,price (all imports as buy). To import sells, add an optional first column:
type,coin,amount,price buy,BTC,0.5,30000 sell,ETH,1.2,2500
The header row is optional and column order/matches are flexible (symbol, qty, rate also work). Prices may include “$”. Lines that don’t parse are skipped and reported. Parsed entirely in your browser.
For automatic multi-exchange CSV handling and a full transaction ledger, see CoinSight.
My portfolios (0)
No saved portfolios yet. Add some transactions, then “Save portfolio…”.
Portfolios are stored locally in your browser (localStorage) — not on a server, and usable only on this device.
Add a transaction
Total cost of the buy is computed as amount × price per coin.
Buys (0)
No buys yet. Add your first transaction above.
Sells (0)
No sells yet. Switch to “Sell” above to add a sale.