ToolRefinery

Calculators

Fast browser calculators for common technical and business jobs.

Available tools

Find what a given percentage of a value is.

Find the percentage increase or decrease between two values.

Calculate profit and profit margin from cost and revenue.

Calculate markup percentage from cost and revenue.

Calculate the final price after a percentage discount.

Calculate the tax amount and total price for a given tax rate.

Calculate a tip amount and split the total between people.

Estimate the monthly payment for a fixed-rate loan.

Calculate simple interest earned on a principal over time.

Calculate compound interest with a chosen compounding frequency.

Calculate the number of days and weeks between two dates.

Calculate exact age in years, months and days from a birth date.

Convert between metric and imperial length units.

Convert between bytes, KB, MB, GB and TB.

Estimate how long it takes to transfer a file at a given speed.

Estimate how long a download will take at a given connection speed.

Simplify a width/height ratio and scale it to a new width.

Convert a pixel measurement to inches at a given DPI.

Calculate pixels per inch (PPI) from resolution and diagonal size.

Calculate the physical print size of an image at a given DPI.