Health & Fitness Calculators
Free estimators for A1C conversion, cycle prediction and bench press strength, with methods, ranges and limits explained.
Three estimators for health and training questions people look up every day. They are built the same way as everything on this site: the method is on the page, the result is explained, and the limits are stated plainly. None of them replaces a laboratory test or a clinician.
🩸 A1C CalculatorConvert A1C to estimated average glucose (mg/dL or mmol/L) or back, with ADA reference ranges and GMI.
📅 Period CalculatorNext period, ovulation day and fertile window from your last period and average cycle length.
🏋️ Bench Press CalculatorOne-rep max from a recent set using Epley, Brzycki, Lander or Lombardi, plus training weights and benchmarks.
Which tool do I need?
A1C Calculator. to translate a lab A1C percentage into the glucose units on your meter, or estimate A1C from average readings.
Period Calculator. to estimate upcoming cycle dates, ovulation and the fertile window, and understand the four cycle phases.
Bench Press Calculator. to plan training weights from a recent set without testing a true one-rep max.
Health results are estimates and can be wrong for individual bodies and irregular cycles. Do not make medical or training decisions on these numbers alone; consult a qualified healthcare or fitness professional. Read the Disclaimer before relying on any result.