Definition of reckoner in English:

reckoner

noun

  • A table or device designed to assist with calculation.

    ‘income and spending reckoners to help with your calculations’
    • ‘To calculate the delivery of your consignment, please refer to our delivery reckoner or use the calculator on our website.’
    • ‘To figure out the number of rolls of wallpaper you may need, use our handy Roll Reckoner.’

Pronunciation

reckoner

/ˈrɛk(ə)nə/