Free tools

Free tools for health researchers

Calculators and reference libraries built for clinical and health research. Every formula comes from a published source, every number is checked against the original paper, and nothing you enter leaves your browser.

Calculators

Fitness and wearables

VO2 max calculator

Estimate VO2 max from resting heart rate, a 12 minute run, a 1 mile walk or a questionnaire, and compare it with FRIEND 2022 norms by age and sex.

Open the calculator

Reference libraries

Outcome measures

Clinical instruments directory

Scoring, interpretation and use in research for more than 300 validated questionnaires and clinical assessments.

Browse instruments Wearables and sensors

Digital biomarkers library

50 wearable and sensor measures, from step count to heart rate variability, with how each one is measured and validated.

Browse biomarkers

Running a study that collects any of these measures? WeGuide combines ePRO, eConsent, wearable data and participant engagement in one whitelabel app. Book a demo.