Contact
One address covers everything: hello@fieldcalc.net. It is read by whoever keeps the site running, and a message about a wrong number jumps the queue.
Found a wrong answer?
This is the one that matters. If a calculator gives a figure you can prove is off, tell us which tool, what you entered, what it returned and what you expected. Being right is the whole point of the site, so a good bug report is genuinely welcome and gets fixed fast.
Want a tool that is not here yet?
The list is growing tier by tier. If there is a calculation you reach for on the job and cannot find here, send it along — real requests from people doing the work shape what gets built next.
Advertising and sponsorship
Every calculator page reaches a tradesperson at the moment they are measuring something, which is a good place for a tool or material brand to be. Placements are sold directly — a static image and a link, clearly labelled, with no third-party tracking. Enquire at the address above and we will share audience and slot details.
New tools, now and then
We add calculators most weeks. Drop your email and get a short note when a new one lands — nothing else, no selling your address, one-click out.