Work out the gas cost of Ethereum calldata

Estimate the data-byte gas and fee for Ethereum calldata at a chosen gas price.

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ToolEthereum Calldata Cost
Input
Output
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How it works

Hex calldata is decoded into bytes, zero and non-zero bytes are counted, and intrinsic data gas is four per zero byte plus sixteen per non-zero byte. That gas total is multiplied by the entered price and formatted in wei, gwei, and ether.

  • Twenty gwei is only a planning starting point, not a network quote.
  • The byte rates come from EIP-2028 and ignore the ABI meaning of the bytes.

Worked example

A short piece of calldata at 20 gwei
4 bytes, 2 zero and 2 non-zero, so 2*4 + 2*16 = 40 gas
Input
											Calldata hex: 0x0000abcd
Gas price gwei: 20
Output
												Byte count: 4
Zero byte count: 2
Non zero byte count: 2
Gas units: 40
Cost wei: 800000000000
Cost gwei: 800
Cost ether: 0.0000008

When to use this

Contract engineers budget transaction overhead, ABI encoders compare packed arguments, and fee dashboards model byte charges.

Edge cases

  • 0x00 costs four data gas while 0x01 costs sixteen.
  • An odd number of hex digits cannot form bytes and is rejected instead of silently padded.
  • The result excludes execution gas, the transaction base cost, and blob fees.

References