Health

Find the Right Health Calculator

This page helps you find the right tool for your specific health question. Rather than general wellness advice, each section below points to calculators that address a concrete situation — from tracking a pregnancy to assessing air quality in your area. All tools run privately in your browser.

Pregnancy and Reproductive Health

If you're pregnant or trying to conceive, this cluster of tools covers the most common tracking questions. The Pregnancy Calculator estimates your due date and current week based on your last menstrual period or conception date, and shows a week-by-week milestone timeline. Once you know you're pregnant, the Pregnancy Weight Gain Calculator shows the recommended gain range for your pre-pregnancy BMI and trimester — guidelines vary significantly based on starting weight.

If you're actively trying to conceive, the Ovulation Calculator estimates your fertile window based on cycle length, and the Period Calculator projects future cycle dates up to 12 months out. For anyone in labor or timing contractions during late pregnancy, the Contraction Timer tracks duration and interval to help determine when to call the hospital. See all tools and guides in the Pregnancy & Reproductive Health hub.

Mental Health and Wellness

If you're feeling chronically exhausted or disengaged from your work, the Burnout Score Calculator uses validated survey questions to estimate your burnout level across exhaustion, cynicism, and efficacy dimensions. For people dealing with acute anxiety or stress, the Anxiety Grounding Tool provides a structured 5-4-3-2-1 sensory grounding exercise that's clinically used to interrupt anxious thought patterns. These aren't diagnostic tools, but they can help identify patterns worth discussing with a healthcare provider.

If screen time is affecting your sleep or focus, the Digital Detox Calculator helps you set structured limits and visualize daily device usage. For remote workers and those struggling to disconnect, the Work-Life Balance Calculator scores your current hours and boundaries across work, personal time, and rest. The Breathing Timer supports guided breathing exercises like box breathing (4-4-4-4) or the 4-7-8 technique, both of which have research support for acute stress reduction. For anyone trying to build new routines, the Habit Tracker provides a simple visual streak-based tool for maintaining consistency. See all tools and guides in the Mental Health & Wellness hub.

Body Measurements and Metrics

The BMI Calculator computes Body Mass Index from height and weight in metric or imperial units. BMI is a rough screening tool — it doesn't account for muscle mass, bone density, or body fat distribution, but it's still widely used in clinical settings as an initial assessment. If you spend a lot of time indoors or live at high latitudes, the Vitamin D Calculator estimates your sun exposure needs based on skin tone, latitude, and time of year.

For understanding how caffeine affects your sleep timing, the Caffeine Calculator models the half-life of caffeine in your system and suggests a cutoff time based on your target bedtime. The Sleep Calculator uses sleep cycle timing (approximately 90 minutes per cycle) to suggest optimal wake times from a given bedtime — or optimal bedtimes for a given wake alarm — so you wake up between cycles rather than mid-cycle. Protecting your skin from UV damage depends on your individual tolerance; the Sun Exposure Calculator estimates safe exposure time based on UV index, skin type, and elevation. See all tools and guides in the Body Measurements & BMI hub.

Environmental Health

Air quality has measurable effects on respiratory health, sleep quality, and cardiovascular risk. The Air Quality Reference explains the AQI scale and what each level means for outdoor activity — particularly useful if you exercise outside or have asthma. For UV exposure planning beyond basic SPF advice, the UV Index by City shows historical UV intensity by month for hundreds of cities, so you can plan outdoor activities accordingly.

Seasonal allergies affect roughly 26% of adults in the US, with timing that varies significantly by region and allergen type. The Allergy Season Calendar maps pollen seasons by type (tree, grass, weed) for major US regions. Similarly, flu risk varies by season — the Flu Season Timeline shows historical peak weeks by region to help with vaccination timing. For people who work in loud environments, the Hearing Protection Calculator determines the noise reduction rating (NRR) needed for your exposure level to stay within OSHA safe limits.

People with fair or sensitive skin can use the Skin Type Quiz to identify their Fitzpatrick skin type and understand UV sensitivity, which informs both sun protection needs and how the vitamin D calculator should be interpreted. It is also worth considering that environmental health factors interact in ways that are not always obvious. A city with high UV index may also have poor air quality on hot days, which makes outdoor exercise riskier despite good sunlight. Checking both air quality and UV index together is useful before scheduling outdoor workouts in summer. Noise exposure similarly compounds over time — the hearing protection tool is particularly relevant for concert-goers, construction workers, and anyone using power tools regularly, since hearing loss is cumulative and largely irreversible once it occurs. See all tools and guides in the Environmental Health hub.