Here is a textbook of intuitive calculus. The material is presented in a concrete setting with many examples and problems chosen from the social, physical, behavioural and life sciences. Chapters include core material and more advanced optional sections. The book begins with a review of algebra and graphing. Contents 1. Prerequisites; 2. Functional relationships; 3. Rate of Change; 4. Applications of the derivative; 5. Further differentiation; 6. Antidifferentation and integration; 7. Exponential functions; 8. Logarithmic functions; 9. Differential equations; 10. Further integration; 11. Trigonometric functions.