Convert it · Grades 5–12
Unit Converter with Dimensional Analysis
Change one unit into another and see every step of the chain, with the units crossing out. Then build a chain yourself.
This is an example. Change the number or the units to make it yours.
The chain
Step by step
Why does crossing out units work?
Each conversion factor is a fraction whose top and bottom are the same amount, written two ways. 12 inches over 1 foot equals 1, because 12 inches is 1 foot.
Multiplying by 1 never changes how much you have. It only changes the unit you are counting in.
- A unit on top and the same unit on a bottom divide to 1, so you cross both out.
- Pick which way up to write each fact so the unit you want gone lands across from itself.
- Check the units that are left. If they match what the question asks for, the chain is set up right.
The problem
1 Build the chain
Tap a fact to add it. Flip it so the unit you want gone is across from itself. Stop when only the unit the problem asks for is left.
Fact cards
2 Work out the number
This opens when your chain checks.
Round the way your teacher asks. Roji counts an answer that is within half a percent.