About the toolkit

Show the chemistry between the input and the answer.

This site is a free, static set of chemistry calculation and experimental-data tools for high-school and introductory university study.

Level labels

SL/HL labels are based on the current IB Chemistry guide where practical. A label does not mean a calculator covers every assessment nuance of that topic, and students should follow their own teacher’s conventions and data booklet.

Uncertainty

The uncertainty calculator uses the current course-level rules: absolute uncertainties add for addition/subtraction; percentage uncertainties add for multiplication/division; raising to a power is marked HL-only for Chemistry. These linear rules are not a full statistical covariance model.

Regression

The calibration tool uses ordinary least squares with concentration treated as x. R² describes fit to the chosen linear model. It does not establish causation, chemical validity, absence of systematic error or appropriateness of extrapolation.

Numerical limits

The browser uses standard JavaScript floating-point arithmetic. Intermediate calculations retain more digits than normally displayed. Keep units consistent and use the worked steps to check the model, not just the numerical output.

Review ownership

The public site deliberately does not publish a school name or school email. Corrections are tracked through the STEM portal feedback form.

Cross-subject methods & uncertainty conventions

Independent resource

This site is not affiliated with or endorsed by the International Baccalaureate Organization or any school. Paper 1B practice content is original and does not reproduce examination questions.