Time: 60s
Score: 0
Streak: ×1
Best: --

Unit Flip

°C to °F, km to miles, kg to pounds: some of the most searched sums there are. Pick the closest answer, fast, for 60 seconds.

Unit Flip

20 °C in °F? 10 km in miles? 5 kg in pounds? Pick the closest of four answers for 60 seconds, using quick tricks like “double and add 30” or “× 1.6”. Level 2 flips the direction, level 3 adds inches, centimetres, feet and metres.

60 s
Conversions

How to play

Read the conversion. A value to convert appears, like “20 °C in °F?”.
Pick the closest. Tap the closest of four answers, or press 1 to 4. Only one is close; the others are clearly off.
Time. You have 60 seconds. Level 2 starts after 5 right answers, level 3 after 12. A wrong answer costs 2 seconds and resets your streak.
Score. Each right answer scores 10, 15 or 20 points by level plus up to 5 for speed, multiplied by your streak: ×2 after 4 right in a row, ×3 after 8, ×4 after 12.

Quick tips

°C to °F. Double it and add 30. Exact: × 1.8 + 32. Great for weather.
°F to °C. Take off 30 and halve. Exact: take off 32, then ÷ 1.8.
Miles and km. Miles × 1.6 = km; km × 0.6 = miles. A 10 km run is about 6.2 miles.
Kilos and pounds. kg × 2.2 = lb: double it, then add a tenth of that. Halve pounds and take off a tenth to get kg.
Inches and feet. 1 inch = 2.54 cm; 1 metre is about 3.3 feet.