uint256.xyz

A deterministic uint256 & big-number calculator for Web3 developers.

👉 https://uint256.xyz

If you've ever been confused by e18 math, JS float errors, or Solidity uint256 calculations — this tool is built for you.

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✨ What is uint256.xyz?

uint256.xyz is a simple, reliable big-number calculator designed specifically for Ethereum, Solana, and Web3 development.

It helps you safely calculate:

• uint256 values used in Solidity
• e18 / e9 / e12 token amounts
• Percentages, fees, and ratios
• Large integer math without floating-point errors

No wallet.
No RPC.
No guessing.

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🔥 Why use this?

❌ Common problems

• JavaScript Number precision issues
• Manual e18 conversions gone wrong
• Fear of overflow or rounding mistakes
• Rewriting the same math in scripts just to sanity-check values

✅ What this tool gives you

• Deterministic big-number results
• Human-readable math expressions
• Chain-friendly precision (e18 / e9 / e12)
• Fast sanity checks before deploying contracts

🛠 Features

• Big integer math (uint256-safe)
• e18 / e9 / e12 precision support
• Rounding-safe calculations
• Expression-based input
• No floating point errors
• Free & instant

👨‍💻 Who is this for?

• Solidity developers
• DeFi engineers
• Web3 auditors
• Blockchain data analysts
• Anyone dealing with token math