Four free tools for students: a percentage calculator, a unit converter, a marks and grade calculator, and a BMI calculator.
Choose a tab, type your numbers, and the answer appears straight away with the working shown. Use these tools to check your homework, plan your revision or understand how a calculation works.
Grade bands are an example only: A* 90% and above, A 80%, B 70%, C 60%, D 50%, E 40%. Your school or board may use different bands.
For adults aged 18 and over. BMI compares weight with height. It is a screening tool, not a diagnosis, and it does not measure body fat or muscle. Please ask a doctor or registered dietitian about personal health questions.
Type numbers into the boxes and read the answer below them. Every answer shows the working, so you can learn the method as well as check the result. For example, 15% of 80 is 15 ÷ 100 × 80 = 12.