13 tools
File, image and everyday calculators
Handy calculators for designers, students and small businesses: work out print sizes and DPI, convert pixels to centimetres, check aspect ratios, calculate GST and EMI, discounts and percentages. Everything calculates instantly as you type.
Most used
- Aspect Ratio CalculatorFind the aspect ratio of any size, or calculate a missing width or height.
- Percentage CalculatorCalculate percentages, percentage change and what percent one number is of another.
- GST CalculatorAdd or remove GST at 5%, 12%, 18%, 28% or any rate, with CGST/SGST and IGST split.
- EMI CalculatorCalculate loan EMI, total interest and a full month-by-month repayment schedule.
More tools
- File Size ConverterConvert between bytes, KB, MB, GB and TB (binary and decimal) and estimate download times.
- Image File Size CalculatorEstimate how large an image will be for given dimensions and format.
- Download Time CalculatorHow long will a file take to download or upload at your internet speed?
- DPI CalculatorWork out DPI from pixels and print size, or the pixels you need for a print at a given DPI.
- Print Size CalculatorSee how large you can print a photo in inches and centimetres at 150, 240 and 300 DPI.
- Pixels to cm / mm / inchesConvert between pixels, centimetres, millimetres, inches and points at any DPI.
- Paper Size Chart (A4, Letter…)Dimensions of A-series, Letter, Legal and photo sizes in mm, inches and pixels at any DPI.
- Discount CalculatorFind the sale price and savings, including “extra X% off” stacked discounts.
- Currency ConverterConvert between INR, USD, EUR and other currencies using your own rate or the ECB's published reference rates.
Frequently asked questions
Are the currency rates live?
No live market feed is used. You can enter your own rate, or load the daily reference rates published by the European Central Bank — clearly labelled with their date.
Are GST results official?
They use the standard GST formulas. For filing, rely on your invoices and a tax professional.
Is anything stored?
No. Calculations happen in your browser.