Tools: the numbers worked out for you
Each one answers a single question and shows what the answer means on a real pipe — not just the arithmetic. No sign-up, nothing to install.
Inch to mm converter
Convert inches to millimetres and back — the calculator takes fractions like 3/4 and 1 1/2. Enter a measurement in millimetres and see which pipe size it matches.
What connects to what
Pick what you have on each side — PP-R, multilayer, PEX, copper or a thread — and see which fitting joins them, what it is called in the shop, and how to seal it.
PP-R fusion calculator
How many seconds to heat PP-R by diameter, how long to hold it and when it takes pressure — plus the piece length to cut, socket depth counted in.
This is where the small lookups live: how many mm is 1/2 inch, what part goes between a multilayer pipe and a polypropylene one, how many seconds d25 spends on the iron and how long to cut the piece. Straight answers, with the plumbing context that a plain calculator leaves out.