Estimate fees from virtual size, not transferred value
Enter the estimated virtual size of your transaction in vbytes. Each fee estimate is the provider's sat/vB recommendation multiplied by your chosen virtual size, rounded up to whole satoshis. Dividing that result by 100,000,000 converts the estimate to BTC.
For example, an illustrative 141 vB transaction at 8 sat/vB costs an estimated 1,128 satoshis. The amount of BTC sent is not part of this multiplication. Inputs, outputs and script types influence virtual size, so a wallet's actual transaction estimate is preferable to an assumed size.
A fee queue is an observation, not a promise
The backlog summary reports transactions, virtual bytes and total attached fees observed by the provider's node. The histogram shows the first returned fee bands and cumulative virtual bytes in the displayed higher-fee bands. Different nodes can hold different unconfirmed transactions.
Fee recommendations and time labels are estimates. New transactions can arrive, miners can choose different sets, and your transaction may have additional constraints. This tool does not construct, sign or broadcast a transaction. It helps compare cost assumptions while leaving execution to your wallet.