Conversion Factors to Know

Every conversion problem in this unit is built from a small set of fixed relationships between units. Before working the practice sets, make sure these are in memory — when you can recall them instantly, the problems become set up and cancel instead of set up and guess.

You only need the canonical direction shown below. You do not need to memorize the reverse: you need "1 kg = 2.2 lb" — you do not need "1 lb = ? kg." In a dimensional-analysis setup, you write each factor in whichever direction makes the units cancel.

Type your answer and press Check. Use Reveal answer only after you've given it a try.

Metric mass

Weight (US to metric)

Volume

Time

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Temperature works differently

Temperature conversions use a formula, not a fixed factor: \(°F = (°C \times 1.8) + 32\). You'll practice those in the temperature problems rather than here.

If any of these took more than a second

Spend a few minutes committing it to memory before starting the practice sets. These twelve relationships are the foundation everything else is built on.