How to convert satoshi, gwei, and wei

Crypto units span many zeros. This converter keeps satoshis, gwei, and wei linked so one wrong scale does not become an expensive transaction. Use this guide when you are drafting a Bitcoin amount in sats for Lightning or on-chain. Follow the steps below, then open the matching CryptonicTools page. Avoid javaScript number precision can wobble on extreme wei magnitudes.

Guide to BTC↔satoshi and ETH↔gwei↔wei conversions for invoices, gas quotes, and contract values — all client-side.

Open the tool

Crypto units span many zeros. This converter keeps satoshis, gwei, and wei linked so one wrong scale does not become an expensive transaction.

Launch Satoshi / Gwei / Wei Converter →

Purpose

Crypto units span many zeros. This converter keeps satoshis, gwei, and wei linked so one wrong scale does not become an expensive transaction.

When to use it

You are drafting a Bitcoin amount in sats for Lightning or on-chain
A gas oracle quotes gwei and you need ETH cost intuition
A contract or explorer shows wei and you need human ETH
You are double-checking unit math offline after the page loads

How to use it

Pick BTC or ETH tab. Use BTC↔Satoshi or ETH↔Gwei↔Wei depending on the chain.
Type any linked field. Edit BTC, sats, ETH, gwei, or wei; siblings update instantly.
Cross-check gas cost. Combine gwei with a gas limit mentally or via the gas cost tools.
Validate addresses separately. Use the wallet validator before you paste a destination.

Benefits

Exact rational scaling for standard BTC and ETH units
Fully client-side after load — no API required
Reduces decimal mistakes on invoices and ABI values
Pairs with gas tracker and wallet validator

Pitfalls to avoid

JavaScript number precision can wobble on extreme wei magnitudes
Does not replace wallet simulation for fee markets
Lightning and some L2s use additional unit conventions
Always re-read the final wallet confirmation screen

Core unit relationships

1 BTC = 100,000,000 satoshis. 1 ETH = 1e9 gwei = 1e18 wei. Explorers, wallets, and smart contracts bounce between these scales constantly. The converter keeps fields live-linked so you paste once and read the human form.

Gas trackers speak gwei; many contract calls expect wei; accounting sheets prefer ETH. Being fluent across all three is a practical skill, not trivia.

Benefits for gas and invoice workflows

Before you mint or bridge, check the gas tracker, then translate gwei into an ETH cost for your expected gas limit. Before you pay a BTC invoice, confirm sats match the intended BTC. CryptonicTools keeps both flows free and local.

Purpose: fewer irreversible typos

On-chain mistakes are hard to undo. Unit confusion is one of the most common preventable errors. This tool’s purpose is to make the scale obvious before you sign — not to replace careful wallet review.