These are the sums that come up every week: a percentage of a salary, the real price in a sale, a cheque amount in words, or what last year's rupees are worth now. Each calculator shows its working, so you can check the answer by hand.
Start with the percentage calculator, which covers six kinds of percentage question. The discount calculator shows why 50% + 20% off is really 60% off. Amount in words writes rupees in lakh and crore, in million and billion, and in Urdu.
For business, the profit margin calculator separates margin from markup, and the CBM calculator sizes a shipment against a container. Students preparing to study abroad can check an overall score with the IELTS band calculator. Cricket fans can follow a points table with the net run rate calculator.