BTC Fee Calculator
Use this BTC fee calculator to compute transaction fees from total input and output values, with optional fee rate output in satoshis per virtual byte.
Example Usage
- Subtract total outputs from total inputs to confirm the actual fee paid.
- Calculate fee rate in sat/vB when you already know the transaction virtual size.
- Check whether a Bitcoin transaction is overpaying or underpaying relative to its size.
BTC Fee Calculator Explained
A BTC fee calculator helps you work out the actual fee a Bitcoin transaction pays by subtracting total outputs from total inputs. If you also know the transaction virtual size, the tool can estimate the fee rate in satoshis per virtual byte, which is one of the most common ways to compare Bitcoin transaction costs. This is useful when debugging wallet fee logic, reviewing transaction history, checking exchange withdrawal behavior, or verifying fee assumptions before broadcast. It gives you a quick way to inspect fee math without opening a spreadsheet or writing a script.
FAQ
How is Bitcoin fee calculated?
It is the difference between the total input value and the total output value.
What is sat/vB?
It means satoshis per virtual byte, a common fee rate unit for Bitcoin transactions.
Do I need the transaction size for the fee itself?
No. You only need size if you also want the fee rate, not just the total fee.
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