Calculate market shifts with bubbly precision.
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Launched in late 2025, the Crypto Price Change Calculator is a sophisticated, fully client-side web utility engineered for precision in cryptocurrency analysis. It empowers users to compute accurate percentage changes between any two holdings from the live top 10 by market cap (Bitcoin currently ~$87,000 USD as of December 19, 2025).
Featuring automatic USD normalization for cross-asset comparisons, an interactive multi-fiat conversion table (USD/EUR/GBP with per-row swapping and sorting), satoshi-level precision, real-time previews, and robust warnings, it delivers professional insights without any data collection.
Built as a stateless static site with SvelteKit and deployed on GitHub Pages, all dynamic features run seamlessly in your browser via CoinGecko's public API – ensuring speed, privacy, and global accessibility.
Enter your Old Amount and New Amount with full decimal precision (e.g., 0.0000025 BTC). Select cryptocurrencies from the live top 10 dropdowns – the new defaults to the old for convenience.
Instant USD previews update as you type. Click Calculate for the percentage delta (auto-converted to USD if different coins). Results include warnings for >50% drops and a copy button.
Below, explore the Live Conversion Table: switch fiats per row, click Swap to reverse direction (up to 8 decimals), and sort by value. Hit Refresh Live Data anytime for fresh market rates.
Perfect for portfolio tracking, trade evaluation, or sat-stacking analysis – all client-side, private, and lightning-fast.
Data source: CoinGecko public API – reliable aggregated prices.
Update frequency: On page load or manual refresh.
Cross-coin accuracy: USD normalization ensures true value-based percentages.
Offline capable: Core calculations work without internet; live features need connection.
Precision: Unlimited decimals for satoshis and micro-holdings.
Privacy: Zero tracking, cookies, or data collection.
Deployment: Static on GitHub Pages – live features fully functional via client-side API calls.
Not financial advice: Informational tool only.