Floating Point Conversion Calculator

Interactive tool for converting and visualizing floating-point numbers across standard and custom formats. Convert between FP32, FP16, BF16, TF32, FP8, etc. while inspecting binary representations and precision loss.

Live URL: https://sw23.github.io/fp-conv/

Features

Format presets: FP64, FP32, FP16, BF16, TF32, OCP FP4/FP6/FP8
Integer formats: INT32, UINT32, INT16, UINT16, INT8, UINT8, INT4, UINT4
OCP format support: Full support for Open Compute Project microscaling formats
Custom formats: Define any bit layout (0–15 exponent bits, 0–112 mantissa bits)
Interactive editing: Toggle individual bits and see decimal/hex updates
Precision analysis: Calculate absolute and relative error between formats
Special values: Explore zero, infinity, NaN, subnormals, and boundary cases
Rounding modes: Implements IEEE 754 rounding modes (ties to even, ties away from zero, toward zero, toward +inf, and toward −inf)
Fixed-point mode: Set exponent bits to 0 for fractional representations
Shareable links: Bookmark or share a conversion via URL parameters (input/output format, value, and rounding mode)
Mobile-friendly: Works on screens of all sizes
WebMCP API: AI agents can perform conversions via WebMCP

Supported Formats

The following standard formats are supported, in addition to any custom format you define (up to 15 exponent bits and 112 mantissa bits). Interactive pages have been created to help explain and visualize each standard format:

IEEE 754: FP64, FP32, FP16
ML/AI: TF32, BF16
Integer: INT32, UINT32, INT16, UINT16, INT8, UINT8, INT4, UINT4
OCP Microscaling: FP8 E4M3, FP8 E5M2, FP6 E2M3, FP6 E3M2, FP4 E2M1
Custom: Supports a wide range of user-defined formats

MCP Server

The fp-conv-mcp npm package provides a local Model Context Protocol server, giving agents direct local access to floating point format conversions.

Example client configuration (VS Code, .vscode/mcp.json):

{
  "servers": {
    "fp-conv": {
      "type": "stdio",
      "command": "npx",
      "args": ["-y", "fp-conv-mcp"]
    }
  }
}

See the package README for full usage, per-client setup, and debugging instructions.

Command-Line Tool

The fp-conv-cli npm package provides a cross-platform command-line version of the converter (Windows, macOS, and Linux), reusing the same conversion engine as the web app and MCP server. The installed command is fp-conv.

npx fp-conv-cli convert 3.14 --from fp32 --to fp16

It supports encode, decode, convert, info, and list commands with human-readable or --json output. See the package README for full usage and examples.

Development

See CONTRIBUTING.md for local setup, testing, linting, serving the site, and the oracle test-vector workflow.

Fp Conv

README