What is the smallest unit of Bitcoin?

The smallest unit of Bitcoin is 1 Satoshi, which equals 0.00000001 BTC. It is named after Bitcoin's pseudonymous creator, Satoshi Nakamoto.

Why does Ethereum use Wei instead of ETH?

Wei allows Ethereum to represent extremely small fractions without floating-point errors. Smart contracts perform all math in Wei (integers) and then convert to ETH for display.

Can I convert between Bitcoin and Ethereum units?

The unit converter handles same-chain conversions (Satoshi to BTC, Wei to ETH). Cross-chain value comparison requires a current exchange rate, which is a different tool.

How to Convert Crypto Units

3 min readCrypto

Cryptocurrency denominations can be confusing. Bitcoin uses Satoshi, Ethereum uses Wei and Gwei, and getting the decimal places wrong can be costly. This guide shows you how to convert between units accurately using Toolin's Crypto Unit Converter.

Quick Steps

1
Open the Crypto Unit Converter
Go to the Crypto Unit Converter tool on Toolin.
2
Pick your source unit
Select the unit you are converting from (Satoshi, Wei, Gwei, etc.).
3
Enter the amount
Type the value to convert. High-precision numbers are supported.
4
Read or copy the result
The converted value appears instantly. Use the copy button to grab it.

Crypto Unit Converter

Convert between Satoshi, Wei, Gwei, ETH, BTC and more

Open Tool

Why Crypto Unit Conversion Matters

Smart contracts, wallets, and APIs often report values in the smallest possible unit. Ethereum gas prices are quoted in Gwei, but balances appear in ETH. If you confuse Wei for Gwei, you might overpay by a factor of one billion. A reliable converter prevents expensive mistakes and saves time during development or trading.

Common Conversion References

1 BTC = 100,000,000 Satoshi (10^8)
1 ETH = 1,000,000,000,000,000,000 Wei (10^18)
1 Gwei = 1,000,000,000 Wei (10^9)
1 ETH = 1,000,000,000 Gwei (10^9)
1 mBTC (millibitcoin) = 100,000 Satoshi

Using the Converter

Select the source unit

Choose the unit you are converting from, such as Satoshi, Wei, Gwei, BTC, or ETH.

Enter the amount

Type the value you want to convert. The tool supports very large and very small numbers with full precision.

Choose the target unit

Select the unit you want to convert to. The result updates instantly.

Copy the result

Click the copy button to grab the converted value for use in code, transactions, or documentation.

Practical Example

Gas Price: 25 Gwei
Gas Limit: 21,000
Fee in Gwei: 25 × 21,000 = 525,000 Gwei
Fee in ETH: 525,000 ÷ 1,000,000,000 = 0.000525 ETH

Try Crypto Unit Converter Now — Free, No Sign-up

Frequently Asked Questions

What is the smallest unit of Bitcoin?: The smallest unit of Bitcoin is 1 Satoshi, which equals 0.00000001 BTC. It is named after Bitcoin's pseudonymous creator, Satoshi Nakamoto.
Why does Ethereum use Wei instead of ETH?: Wei allows Ethereum to represent extremely small fractions without floating-point errors. Smart contracts perform all math in Wei (integers) and then convert to ETH for display.
Can I convert between Bitcoin and Ethereum units?: The unit converter handles same-chain conversions (Satoshi to BTC, Wei to ETH). Cross-chain value comparison requires a current exchange rate, which is a different tool.