A robust and user-friendly tool designed for students and scientists to accurately determine the number of significant figures in a given number. This calculator also performs mathematical operations (addition, subtraction, multiplication, and division) while correctly applying the rules for significant figures to the result. It provides clear results, showing the calculated answer and the answer formatted to the correct number of significant figures, making it an essential tool for chemistry, physics, and other science classes. It helps prevent common errors in scientific calculations and reinforces the understanding of measurement precision.