Supplements
Vitamin A D E K Deficiency: What the Signs and Numbers Show
Vitamin A, D, E and K deficiency is rare in healthy women, with one exception. Here are the real blood numbers, the signs, and who over 40 should check.
Read the guideYour body after 40, in numbers you can check.
Twenty-eight calculators, guides and meals for women in perimenopause and after. Every number carries its WHO, CDC or NIH source, and the ones you check stay on your own device.
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BMI Calculator
Check if your weight is in the healthy range for your height.
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Calorie Calculator
Find out how many calories you need per day to lose, maintain, or gain weight.
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Protein Intake Calculator
How much protein you need per day based on your weight and activity.
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High protein meals, weighed to your calories
See what your calorie and protein target looks like as food.
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Sleep Calculator
The best times to go to bed or wake up, based on 90 minute sleep cycles.
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Macro Calculator
Get your daily protein, carbs, and fat targets for your goal.
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Body Fat Calculator
Estimate your body fat percentage with the U.S. Navy method.
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Period Calculator
Predict your next periods and see your cycle at a glance.
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Intermittent Fasting Calculator
Get your fasting and eating window times for 16:8, 18:6, and more.
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Ideal Weight Calculator
See your ideal weight range based on four medical formulas.
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Waist to Hip Ratio Calculator
Check your waist to hip ratio and what it means for your health.
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Body Shape Calculator
Find your body type from your bust, waist, and hip measurements.
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BMR Calculator
Calculate your basal metabolic rate, the calories your body burns at rest.
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Water Intake Calculator
How much water you should drink per day, based on your body and lifestyle.
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Pregnancy Due Date Calculator
Estimate your due date from your last period, conception date, or IVF transfer.
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Ovulation Calculator
Find your fertile window and most likely ovulation days.
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Pregnancy Weight Gain Calculator
See the recommended weight gain for your stage of pregnancy.
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Heart Rate Zone Calculator
Find your target heart rate zones for fat burning and cardio training.
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Calories Burned Calculator
How many calories you burn walking, running, cycling, and more.
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Lean Body Mass Calculator
Estimate how much of your weight is muscle, bone, and organs.
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Creatine Calculator
Your creatine dose from body weight: a loading week or a steady dose, and how long each takes to work.
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Child Height Predictor
Estimate how tall your child will be as an adult, from parent heights.
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Steps to Calories Calculator
Turn your step count into calories burned and distance covered.
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Blood Pressure Checker
See which category your blood pressure reading falls into.
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Mean Arterial Pressure Calculator
Your mean arterial pressure from a blood pressure reading, and what the range means.
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Pain Scale
Rate pain from 0 to 10, see what the number means, and check the signs that need a doctor.
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Skin Type Quiz
Five questions to tell dry, normal, combination and oily skin apart, and whether it is sensitive.
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A1C Calculator
Convert between A1C and average blood sugar, both directions.
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Caffeine Calculator
Find your safe daily caffeine limit and what it equals in drinks.
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Guides this week
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Sleep and Stress
Sleep Hygiene for Night Shift Workers: What Actually Works
Standard sleep advice was built for people who sleep at night. Here is what the evidence says works for night shift workers, with the numbers the generic lists skip.
Weight Loss
Ketogenic Diet Weight Loss Plateau: Why It Happens and How to Break It
A keto stall almost never means failure. Here is what the research shows about why a ketogenic diet weight loss plateau happens and the steps that break it.
Sleep and Stress
Magnesium for Sleep: What the Evidence Actually Shows
Magnesium may help you fall asleep faster, but the benefit is modest and the dose matters. Here is what the trials found, which form has evidence, and where to stop.
High protein recipes, measured to the gram
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Listen to the guides
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Vitamin A D E K Deficiency: What the Signs and Numbers Show
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Sleep Hygiene for Night Shift Workers: What Actually Works
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Ketogenic Diet Weight Loss Plateau: Why It Happens and How to Break It
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How this site works
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Sources first
Every number traces to the WHO, CDC, NIH, USDA or a peer-reviewed paper, listed at the bottom of the page. No source, no claim.
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Formulas shown
Every tool prints its formula and its floors: never below 1,200 kcal for women or 1,500 for men.
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Dated and corrected
Each page shows when it was last updated. Corrections are made in the text and noted at the bottom.
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Money, plainly
Ads come from Google and are kept out of our own text. The paid plan is the only thing we sell. We do not sell supplements.