Camera FOV & PPF Calculator
Pick a lens and see what it actually covers — and how far away a face is still identifiable.
Free, no signup
Free tools for low-voltage and security
The arithmetic an installer does on the tailgate, done properly. No signup, no email, and nothing to install — these run in the browser, so they work on a phone with one bar of signal.
CCTV Video Storage Calculator
Work out how much disk a system really needs — with the mix of cameras you are actually installing.
Free low-voltage tools for your website
Run any of these calculators on your own site. If you write about lens choice or recorder sizing, your reader can do the sum on the page instead of leaving to find a calculator somewhere else.
- Copy and paste one line of HTML — no script, no build step
- Nobody needs a FieldMarkup account, yours or theirs
- Resizes to whatever column you drop it in, on phone or desktop
- Free to use, with a small “Powered by FieldMarkup” credit
More tools coming
PoE budget
What the switch can actually carry.
Voltage drop
Gauge and distance on a DC run.
NAC loop
Candela load against the panel's limit.
If there is one you keep doing by hand, tell us which.