Ballpark — October 4, 2026
Answers to that day's 5 daily estimation questions.
Countries in the European Union (current)
27 countries
The EU currently has 27 member states.
Elements on the periodic table
118 elements
Elements 1–118 are officially recognized.
How many calories are in a 32-oz jar of mayonnaise?
~5,440 calories
A typical 32-oz jar of mayo contains roughly 5,000–6,000 calories total.
About how much potassium is in an average banana?
~420 mg
A medium banana has a bit over 400 mg of potassium.
About how much caffeine is in a 12-oz cup of brewed coffee?
~140 mg
A typical 12-oz brewed coffee often lands around 100–200 mg of caffeine.