CostBasis Calc
CostBasis Calc is a free, browser-based crypto cost basis calculator. It allows users to add cryptocurrency buy and sell transactions and instantly computes average cost basis, total invested, and realized gains and losses per coin. The application is designed for simplicity and privacy: no account is required, and all data remains in the user's browser via localStorage. Users can save portfolios locally, clear all data, and import transactions from CSV files with a flexible format that supports optional headers and column name variations such as symbol, qty, and rate. CSV imports are parsed entirely in the browser, with lines that fail to parse being skipped and reported. The tool supports both buy and sell transactions, and calculates cost basis per coin as total invested divided by total coins bought. For users needing automatic multi-exchange CSV handling and a full transaction ledger, the homepage recommends CoinSight, a separate product. CostBasis Calc is positioned as a quick, private utility for individual crypto investors rather than a comprehensive tax reporting platform.
- Category
- Analytics
- Pricing
- Free
Problem solved
CostBasis Calc solves the problem of tracking cryptocurrency cost basis and realized gains/losses without requiring an account or uploading sensitive financial data. It provides immediate calculations from manually entered or CSV-imported transactions, all within the browser, helping investors understand their tax position and investment performance.
Use cases
- Calculate average cost basis per cryptocurrency coin
- Track realized gains and losses from crypto sells
- Import transaction history from a CSV file
- Save and manage multiple portfolios locally in the browser
- Quickly estimate tax liability from crypto trades
- Privacy-conscious users who want to avoid account creation
Audience
- Hobbyists
- Business Users
- Startups
Pros
- No account required
- Data never leaves the browser
- Free to use
- Simple and fast for basic cost basis calculations
- Supports CSV import with flexible column names
Cons
- No automatic multi-exchange CSV handling
- No full transaction ledger
- Data is only stored locally on one device
- Not a comprehensive tax reporting tool
- No mobile app or sync
Official website: https://08cacdeb19b53c969f109b00819e07c1.ctonew.app/
Canonical LambdaBase page: https://www.lambdabase.com/tools/costbasis-calc