Free online calculators

Computes memory for a GGUF model from GPU layers and context size.

Open-source compound interest calculator with a growth chart.

Computes Dutch mortgage loans (Dutch interface).

Dutch mortgage tool: monthly payments, extra repayments and buy-versus-rent analysis.

Evaluates a typed math expression and supports functions such as sqrt, sin, cos and abs.

Works out a percentage of a value, a value as a percentage of another, or percent change.

Knit and crochet helper that suggests size, checks yarn yardage and gauge; no login and works offline.

Converts a knitting swatch into stitch, row and yarn-length estimates for a target size.

Calculator for engineering tasks that handles several variables and user-defined formulas, built by prompting an AI coding tool.

Aviation calculator for approach minima, climb gradient, rate of descent and common unit conversions.

Electronics calculators for resistor color codes, Ohm's law, voltage dividers and more.

Upload a floor plan image, set its scale, then trace areas to get a digital takeoff of room sizes.

Converts between bytes, kilobytes, megabytes and larger data units.

Tells you which weekday a given date falls on.

Converts a number of days into hours.

Converts a number of hours into days.

Checks whether years are leap years.

Turns a number of seconds into hours, minutes and seconds.

Adds up a pasted list of numbers.

Calculates the span between two dates in days, hours and other units.

Converts a clock time into decimal hours, useful for timesheets.

Converts hours, minutes and seconds into total seconds.

Truncates a clock time to a coarser unit.

Shows voltage drop, power loss and maximum run length for a wire gauge in AWG or mm2, copper or aluminium.