Description

The Yen Conversion Calculator (Offline Sheet) is a powerful spreadsheet-based tool built for crypto traders, NFT collectors, and DeFi participants in Japan who need to accurately convert foreign currency values into Japanese yen (JPY) for tax reporting and accounting. This calculator is especially important under Japanese tax law, which requires you to declare the value of each transaction in yen at the exact date and time it occurred. The sheet includes built-in historical FX rate input fields, manual override options, and automated formulas for calculating yen equivalents for crypto trades, NFT sales, staking rewards, and even gas fees. You can input the original cryptocurrency amount, USD/BTC/ETH value, transaction time, and your preferred FX source (e.g., OANDA, Yahoo Finance). A dynamic table then outputs the JPY value, rounded according to National Tax Agency (NTA) guidelines. There’s a separate tab for bulk imports, making it easy to convert entire transaction histories exported from exchanges. Conditional formatting alerts you when exchange rates are missing or if conversion falls outside daily average thresholds. Additional features include a snapshot summary of total converted gains per wallet, tags for taxable vs. non-taxable conversions, and a timestamp verification tool to match values with your transaction logs. Ideal for offline use, this Excel-compatible calculator ensures your sensitive crypto data remains private and secure. It eliminates the guesswork and risk of using online converters that may not reflect the precise timing or source FX rates demanded by Japanese authorities. Whether you're calculating staking rewards from a U.S.-based protocol or adjusting NFT sales from OpenSea, this tool streamlines the process and ensures reporting accuracy.