Hydration & Lifestyle calculators
Water, alcohol, caffeine, sun and habits.
Water Intake Calculator
Daily water needs for your weight, exercise and climate.
Alcohol Units & Calories Calculator
Weekly alcohol units and calories from your drinks.
Blood Alcohol Content Estimator
Rough BAC estimate and time to sober, using Widmark.
Daily Caffeine Intake Calculator
Add up caffeine from coffee, tea, soda and energy drinks.
Smoking Cost & Savings Calculator
What smoking costs and what you save by quitting.
Sun Exposure & SPF Calculator
Estimated time to burn with and without sunscreen.
Daily Step Goal Planner
Build up your steps gradually toward a goal.
Sitting Time Calculator
How much of your waking day you spend sitting.
Alcohol-Free Savings Calculator
Money, calories and units avoided since you stopped.
Habit Formation Calculator
How far along you are toward making a habit automatic.
Quit Smoking Timeline Calculator
See how many days you have been smoke-free and the next health milestone.
Caffeine per Drink Calculator
Estimate the caffeine in your drinks and compare with a 400 mg daily guideline.
Weekly Screen Time Calculator
Turn your daily screen hours into weekly and yearly totals.
Active Commute Minutes Calculator
Weekly minutes of walking or cycling to work or school.
Urine Colour Hydration Check
Use the 1–8 urine colour chart to judge hydration.
Sunscreen Quantity Calculator
How much sunscreen to pack for a day outdoors.
Noise Exposure Safe Time Calculator
How long you can listen safely at a given loudness (NIOSH 85 dBA, 3 dB rule).
Heat Index Calculator
Feels-like temperature from air temperature and humidity (°F).
Water Bottle Refill Calculator
How many times you need to refill your bottle to meet your daily water target.
Coffee Spending Calculator
Yearly cost of your daily coffee habit.
Movement Break Planner
Plan how often to stand up during a day of sitting.
Cooking Oil Calories Calculator
Calories added to a dish by tablespoons of oil.
Gym Cost per Visit Calculator
Work out what each gym visit really costs.
Sugary Drink Calories Calculator
Calories and body-fat equivalent from regular sugary drinks.
Yearly Commute Time Calculator
Total hours you spend commuting each year.
Related guides
Hidden Calories in Drinks
Liquid calories add up quickly and do not fill you up.
Sleep & Mental WellbeingScreen Time and Mental Health in Adults
Quality and context matter more than raw hours.
Sleep & Mental WellbeingBuilding Habits That Stick
Why 21 days is a myth and what the research really says.