Contact
Spot an error, or want a calculator that is not here yet? Get in touch with Figureshed.
The fastest way to reach Figureshed is by email. Please include the name of the calculator and, if you are reporting a problem, the inputs you used and the result you expected. That makes it much quicker to work out whether the maths or the page is at fault.
What to send
- The calculator name and a link to the page.
- The values you entered and the result shown.
- What you expected instead, and why.
Response time
This is a small site run alongside other work, so replies may take a few days. Genuine corrections are prioritised, because a wrong formula is the one thing a calculator site should never ship.
Last updated: October 11, 2026