Unit Duel
Convert between kilometres and metres, hours and minutes, feet and inches and more. Quick unit questions with a daily set to race against.
How to play
- Each question gives a value in one unit and asks for the same amount in another, such as 3 km = ? m.
- Tap the correct number. The clock starts on your first tap.
- A wrong pick is greyed out and counted as a mistake.
- Answer every question to finish. Your time and mistakes are shown at the end.
Tips and strategy
- Going from a big unit to a small one gives a bigger number, so multiply. Small to big gives a smaller number, so divide.
- Metric units move by factors of 10, 100 and 1000, so just shift the decimal point.
- Know the exact imperial factors: 3 feet in a yard, 12 inches in a foot, 16 ounces in a pound, 5280 feet in a mile.
- Time is not decimal. There are 60 minutes in an hour and 24 hours in a day.
FAQ
- Which units are covered?
- Length, mass, volume and time in metric and US customary units, using their exact definitions.
- Do I need a calculator?
- No. Every answer is a clean number you can work out in your head.
- Is the daily set the same for everyone?
- Yes. The eight daily questions are built from the UTC date.