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About this test: This comprehensive assessment covers kilometers ↔ miles, kilograms ↔ pounds, Celsius ↔ Fahrenheit, centimeters ↔ inches, liters ↔ US liquid gallons, grams ↔ ounces, and meters ↔ feet. The 28-question test gives every unit pair four questions and represents both conversion directions.
Difficulty: The assessment mixes Easy, Medium, and Hard source values. Easy questions use simpler whole-number values and require whole-number answers. Medium questions introduce decimal values and require one decimal place. Hard questions use wider ranges and require two decimal places.
Conversion rules: The test uses the exact relationships 1 mile = 1.609344 km; 1 lb = 0.45359237 kg; °F = (°C × 9/5) + 32; 1 in = 2.54 cm; 1 US liquid gallon = 3.785411784 L; 1 international avoirdupois oz = 28.349523125 g; and 1 ft = 0.3048 m.
Scoring: No answer feedback appears during the assessment. Answers are checked against the exact conversion, with a small calculation tolerance so standard rounded conversion factors are not penalized. Halfway values are rounded away from zero. Your final report includes overall accuracy, average response time, results for all seven unit pairs, Metric → US Customary and US Customary → Metric accuracy, Easy/Medium/Hard accuracy, and an answer review. Unanswered questions count as incorrect if the test is ended early.
Controls: Use the ± button when a temperature conversion requires a negative answer. Press Enter to submit, P to pause, or Esc to end the test. Hidden tabs pause the clocks automatically.