The Wonder Drop
Free Health Tools & Calculators
Quick, science-based tests that turn your own numbers into a clear answer in about a minute. They’re free, there’s no sign-up, and every result explains why it’s your number and cites the research behind it.
The Evidence Index
120 popular health myths and facts, each graded A to F against the research, with the key study and a link to the full evidence.
NewWhich Ancient Warrior Are You?
Viking, Samurai, Spartan or Shaolin monk? Find your training style, your blind spot and a 3-day starter week.
NewExercise Library
Step-by-step form guides by muscle group, equipment and level, with common mistakes, variations and the research.
NewWorkout Plan Generator
A free weekly workout plan for your goal, body, days, equipment and level, with sets, reps, cardio, a form guide for every move and your nutrition targets.
NewMeal Plan Generator
A 7-day meal plan built around your calories and protein, with portions, vegetarian and vegan versions and a weekly shopping list.
NewVO2 Max and Fitness Age
Estimate your VO2 max and the age your fitness matches, no treadmill needed, plus an optional 1-mile walk test.
NewHealth and Fitness Glossary
139 gym, nutrition, sleep and research terms in plain English, from RIR and VO2 max to meta-analysis.
NewFitness Tracker and Smart Scale Comparison
18 watches, bands and rings and 12 smart scales side by side, with the independent accuracy research. No affiliate links.
NewProtein Intake Calculator
Find out how many grams of protein you need each day for your body, training and goal, plus what that looks like in real food.
NewWater Intake Calculator
How much water you really need each day, adjusted for your size, exercise, climate and diet, with a simple drinking plan.
NewCalorie Calculator
Your maintenance calories, a safe calorie deficit or surplus for your goal, and your daily protein, carbs and fat.
NewSleep Calculator & Sleep Score
Find your best bedtime from your wake-up time, then get a sleep score out of 100 and the 2 changes that would help most.
NewBMI Calculator
Your BMI and healthy weight range, plus your waist-to-height ratio and what your number really means for your age and build.
NewBody Fat Calculator
Your body fat percentage from a quick tape-measure test, plus your fat and lean mass and a healthy range for your age.
NewZone 2 Heart Rate Calculator
Your Zone 2 heart rate in beats per minute, all five training zones, a talk-test check and how much Zone 2 to do each week.
Each tool is for education and isn’t medical advice. See our medical disclaimer.