Transactions & fees

Transaction Size & Weight Calculator

Understand serialized bytes, transaction weight and virtual bytes.

Runs locally

Security & privacy. Calculations run locally. Check the network and inputs. Estimates of fees, policy acceptance, prices and future block timing are not guarantees.

Use this tool

Calculates on your device. Results that depend on future blocks or policy are estimates.

Exact size and weight of serialized transaction hex. No guessed input-size constants.

Enable JavaScript to use this tool.

What this tool is for

Serialized size, weight and virtual size measure different aspects of a transaction. This calculator measures actual transaction hex rather than estimating from input types.

Supported behavior

Exact size and weight of serialized transaction hex. No guessed input-size constants.

Security & privacy

Calculations run locally. Check the network and inputs. Estimates of fees, policy acceptance, prices and future block timing are not guarantees.