Calculators

Each one implements a named, published equation, cites it, and says what it cannot tell you.

These produce a number from an equation. They do not diagnose anything, do not know your history, and are not a substitute for someone who does. Everything is calculated in your browser — nothing is sent to us or stored.

BMI calculator

Body mass index from height and weight, and the categories the WHO defines.

BMI = weight in kilograms divided by height in metres squared.

A1c to average glucose converter

Convert HbA1c to estimated average glucose using the ADAG equation.

Estimated average glucose (mg/dL) = 28.7 x A1c(%) - 46.7, from the ADAG study.

Heart rate zone calculator

Training zones from age-predicted maximum heart rate, using the Tanaka equation.

Maximum heart rate = 208 - (0.7 x age), from Tanaka et al. Zones are percentages of that maximum.