Health
Lightweight calculators and everyday health references.
Sleep cycle calculator
Pick a wake-up time (or bed time) and get recommended options based on a fall-asleep buffer and ~90-minute sleep cycles. Shareable, browser-only MVP.
BMI calculator
Calculate BMI and a healthy weight range from your height (metric & imperial). Shareable, browser-only.
BMI Prime calculator
Calculate BMI Prime (BMI/25) to see how your BMI compares to the common “normal” upper limit. Shareable, browser-only.
Running pace calculator
Convert distance + time ↔ pace (min/km or min/mi). Also shows speed and simple splits. Shareable, browser-only.
Ovulation window calculator
Estimate ovulation date and fertile window from last period start (LMP) and cycle length. Includes clear disclaimer. Shareable, browser-only.
Body fat calculator (US Navy method)
Estimate body fat percentage with the U.S. Navy tape-measure formula (male/female, metric & imperial). Shareable, browser-only.
Calories burned calculator (MET)
Estimate calories burned from MET × weight × time. Pick an activity preset or enter MET manually. Shareable, browser-only.
Calorie deficit calculator
Estimate your daily calorie deficit and target calories from TDEE and a weekly goal (kg/week or lb/week). Shareable, browser-only MVP.
Recipe scaler
Scale ingredient amounts up or down by servings or multiplier. Paste one ingredient per line and get adjusted amounts. Shareable, browser-only MVP.
Water intake calculator
Estimate a daily water intake goal from weight and activity. Outputs a simple range plus cup/oz conversions. Shareable, browser-only MVP.