The Useful Kind

Tools

Simple tools for everyday decisions

Use practical calculators and planners designed to provide clear general guidance without diagnosing medical conditions.

Available tools

Available tool

Makeup Expiry Calculator

Estimate a cosmetic product’s replace-by date using its PAO symbol and the date it was opened.

Open the Makeup Expiry Calculator

Available tool

Caffeine Cutoff Planner

Choose a practical latest caffeine time based on your planned bedtime and how strongly caffeine tends to affect your sleep.

Open the Caffeine Cutoff Planner

Available tool

Tea Brewing Guide

Get flexible starting temperatures, steeping times and amount guidance for common tea and herbal-infusion types.

Open the Tea Brewing Guide