About this site

I started on compounded tirzepatide and spent the first month redoing the same sum on my phone every Sunday morning, never quite trusting it. The vial says milligrams. The syringe says units. In between sits a division I could do in my head on a good day and got visibly wrong on a bad one.

So I built the calculator, taped a printout of the chart inside a kitchen cupboard, and then realised the printout was the useful part. This site is that printout.

What it is

A conversion tool and a small set of reference charts. Nothing is generated on the fly — every number in the tables is the same arithmetic the calculator does, worked out ahead of time so you can scan it instead of typing.

What it isn't

• Not medical advice. I have no medical training. Your prescriber decides your dose, your schedule, and whether any of this is right for you at all.
• Not a pharmacy, and not connected to one. Nothing is sold here.
• Not for research chemicals. The calculator does arithmetic and doesn't care what's in the vial, but this site is written for people filling a prescription — not for the "not for human use" corner of the internet.

How I handle being wrong

Two things are load-bearing here: the arithmetic and the schedules. The arithmetic is shown on the front page so you can check it yourself. The schedules come from the manufacturers' own prescribing information, and where compounded vials differ from the branded pens I say so rather than smoothing it over.

If something is wrong, out of date, or just unclear, tell me: [email protected]. I read all of it and I fix things faster than you'd expect, because there isn't a committee.

Money

There is none right now. No ads, no sponsors, no affiliate links on the calculator or the chart pages. If that ever changes on the pricing pages I'll label it plainly at the top of the page rather than in a footer nobody reads. The calculator stays clean either way — a tool that quietly nudges you toward whoever pays it is a broken tool.