30+ free tools organized by category. No sign-up, no ads — just answers.
Calculate your Body Mass Index.
Find your daily calorie needs.
Find your ideal body weight.
Estimate body fat percentage.
How much water to drink daily.
Target heart rate zones for training.
Estimate your baby due date.
Optimal sleep/wake times.
Total Daily Energy Expenditure.
Create strong passwords.
Random numbers in any range.
Fuel efficiency (MPG/L per 100km).
Dog years to human years.
Appliance running costs.
Sale prices and savings.
Estimate trip fuel costs.