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Work out the right size, the real cost and the better option.

Free calculators and plain-English buying guides for mobile, car, laptop and e-commerce accessories — built for Indian buyers and Indian sellers.

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Add GST to a price or pull it back out of a GST-inclusive price, with the CGST and SGST split shown separately.

Find the final price after a percentage discount, and exactly how much the offer saves you in rupees.

Turn a cost price and a selling price into profit, margin and markup - three different numbers that are easy to confuse.

Work out what to charge: enter your costs and the margin or markup you want, and get the price to list, with…

Fuel needed and what it costs for any trip, from distance, mileage and the pump price - in kilometres or miles, km/L or…

How many times a power bank will really charge your phone, using a realistic efficiency rather than the number printed…

The formula is on the page

Every calculator shows its method and its variables, so you can check the working rather than take a number on faith.
Sources and assumptions are stated

Fee tables, tax rates and courier slabs are dated. If something is an estimate, we say so.
Updated when the rules change

Marketplace fees and standards move. Pages carry a last-updated date that means something.