Tools
Free, private health calculators for women. Estimate your protein, iron or fiber needs, track your cycle, and more, each tool built on the same evidence as our guides and paired with the context to use it well.
All guides
Menstrual Cycle Calculator: Next Period Dates
Estimate your next period, your current cycle day and the periods ahead from your last period and cycle length. A quick estimate, with nothing stored.
Ovulation Calculator: Fertile Window and Ovulation Date
Free ovulation calculator: estimate your fertile window, ovulation date and next period from one date or your last 3 periods.
Pregnancy Weight Gain Calculator
See the recommended total pregnancy weight gain for your pre-pregnancy BMI, using the Institute of Medicine guidelines.
Vitamin D Calculator: How Much Women Need
See how much vitamin D women need, and a sensible supplement amount when sun is limited, based on the same evidence as our vitamin D guide. Nothing is stored.
Water Intake Calculator for Women
Get a rough daily fluid target based on your weight and activity, in line with health-authority guidance. A general estimate, not a strict rule. No sign-up.
Calorie Calculator for Women: BMR and TDEE
Estimate the calories your body uses each day with the Mifflin-St Jeor equation. A maintenance figure to work from.
Iron Intake Calculator for Women
See how much iron women need each day for your life stage and diet, based on the same evidence as our iron guide. Iron is one to test for before you supplement.
Fiber Calculator: Daily Fiber Target for Women
See how much fiber women need each day, and how far your current intake is from the target. Based on the same evidence as our fiber guide, with no sign-up.
BMI Calculator for Women
Enter your height and weight to see your BMI and the range it falls in. A screening number, not a diagnosis.
Protein Calculator for Women: Daily Target
Enter your weight and activity level for a realistic daily protein range for women. Nothing stored, no sign-up.