FP-Conv is an interactive web-based calculator designed to demystify floating-point number representations. It allows users to convert between various standard formats like IEEE 754 (FP64, FP32, FP16), AI/ML specific formats (TF32, BF16, FP8), and Open Compute Project microscaling formats. Users can also define custom bit layouts, inspect binary representations, toggle individual bits to see real-time decimal/hex updates, and analyze precision loss. The tool supports multiple IEEE 754 rounding modes and explores special values, making it an invaluable resource for education, development, and debugging low-level numerical issues. It also integrates a WebMCP API, allowing AI agents to programmatically perform conversions.