Measuring and Converting with Confidence
Three parts on the most practical maths in this subject. Find out why a number without a unit is not a measurement at all, learn to move between metric units without ever getting the direction wrong, then choose units that make your numbers readable rather than merely correct.
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Upgrading Human Mental Models
Learn how to think in Workflows
Why Do Measurements Need Units?
A number on its own is not a measurement. Learn why a missing or mismatched unit makes a figure unusable — and see what each version of 200 actually tells you.
How Do You Convert Between Metric Units?
Every metric conversion is multiplying or dividing by a power of ten. Learn the prefixes and the direction check that stops most errors.
How Do You Pick the Right Unit for the Job?
Every unit is technically correct and only one is useful. Learn how to pick the unit that turns an unreadable number into an obvious one.