Two ways to work the wall.
Every calculator on the board is free, and it stays that way. Membership is for the regulars — people carrying buy-lists from one job to the next.
The plan you start on
Apprentice
$0/ forever
- 2 projects
- 10 saved calculations
- Every calculator on the wall
What an account gets today. Nothing expires.
For the regulars
One price, once a year
Journeyman
$24/ year
- No ads, anywhere on the site
- Unlimited projects
- Unlimited saved calculations
- Early access to new tools
- Keeps the site running — hosting, upkeep, new calculators
Questions in the meantime? Write to hello@plankmath.com.
The fine print, kept fine
- Limits are enforced server-side. Clearing your browser changes nothing.
- The price is in USD, charged once a year.
- Every calculator stays free on either plan.