How can I measure/predict the fees?

You can use online tools that show the average price of gas on Ethereum. It may be beneficial to await network congestion and send transactions through during less demanding times.

The price to send a transaction may fluctuate greatly with little notice.

Use this website Ethereum Gas Tracker to get an idea of the current gas price. (Average GWEI)

Many different websites and tools are available to keep track of network fees.

Resources:

• Gas price tracker- Chrome version (Browser extension)

• Gas price tracker- firefox version (Browser extension)

• Eth Gas Station (Website)

• Ethereum Gas Charts (Website)

• Eth Gas Watch (Website)

For more information about gas, follow this article.