A hand sanitizer is your best defense against viruses when you're out running errands and can't get to a sink to wash your hands. As a general rule, you should avoid touching your nose, eyes, or mouth with unwashed hands. There are some hand sanitizers that are alcohol-free, and these won't be as effective in killing bacteria and viruses. A hand sanitizer consists of a pretty basic formula, and it's easy to make your own at home if your local pharmacy or retailer is running low.
We over here are using WHO recommend formulation in the app. Just put how much sanitizer you want to make in mL and then the app will provide you the composition of IPA, water, glycerol, Hydrogen peroxide mix them together.
Only pharmacopoeial quality reagents should be used (e.g. The International Pharmacopoeia) and not technical grade products.
This app is just for reference purposes and for helping people to make hand sanitizer at home. Use it with your own discretion. These Calculations Are Based On WHO recomendations given on their website - "Guide To Local Production: WHO-recommended Handrub Formulation".