About
Who builds this, and why it is free.
Dr Sujata Rawlani
Paediatric anaesthetist
Shantilal Sanghvi Eye Institute, Wadala, Mumbai, India
A note from Dr Rawlani
I built these tools for the calculations I kept doing on the back of an anaesthetic chart — and for the trainees who ask the same questions in theatre every week. Everything here is free, works on a phone, and shows its working, so you can check it rather than trust it. My thanks to the colleagues and residents who tested it, argued with the numbers, and told me what was missing.
How to use it
Every value shows its formula and names its source
Check any figure against your local protocol before you act on it
Works offline once loaded — add it to your home screen
No sign-in, no tracking, nothing stored on a server
Found an error, or want a tool that is not here? That feedback is the fastest way this gets better.