Rex says
The fast lane for the math you almost remember from school. Type the numbers, get the answer, move on with your day.
Try a scenario
Click to load — tweak from there.Inputs
Result
Missing term value
12.0000
Solved for
D
Simplified A
3.00
Simplified B
4.00
Psst — share this and help Rex grow
One click, a permanent link with your numbers baked in.
How to use this
- 1Enter a.
- 2Enter b.
- 3Enter c.
- 4Enter d (0 to solve).
- 5Read your missing term value on the right — it updates as you type.
- 6Hit Share to keep the scenario or send it to someone.
About this calculator
Solve A:B = C:D for any missing term. Leave one field at 0 to solve for it.