# Transaction Size & Weight Calculator

> Understand serialized bytes, transaction weight and virtual bytes.

Mode: Runs locally.

## Supported behavior

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

## Security and privacy

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

[Security model](https://qbitcoin.live/security/index.md) · [QBitcoin home](https://qbitcoin.live/index.md)