Travel

Check a bag against an airline weight allowance, see how much is spare or over, and the excess fee at a given rate per kilogram

Convert a clothing size between UK, US, EU and international (XS to XXXL) for womenswear or menswear, tops or bottoms, from any one of them

Work out the total cost of a trip from nights, daily spend by category, flights and a contingency, per person and in total, with a daily allowance left over once the fixed costs are taken out

Convert a shoe size between UK, US, EU and centimetres for men, women or children, from any one of them

Build a packing list from trip length, climate and trip type, with clothing quantities worked out from the number of nights

Look up the plug types, voltage and frequency for a country, and whether an adaptor or a transformer is needed coming from another country

Look up the handful of phrases worth knowing in a language: please, thank you, hello, how much, where is, and help

Convert a ring size between UK letter, US number, EU and Japanese sizes, with the inside circumference and diameter in millimetres, from any one of them