Aspect Ratio Calculator
Find the simplified aspect ratio (like 16:9) from a width and height.
Coin Flip
Flip a virtual coin — instant heads or tails, with running totals for quick decisions and probability demos.
Concrete Calculator
Calculate how much concrete you need for a slab or footing — in cubic yards, cubic metres and pre-mix bags.
Cooking Converter
Convert baking ingredients between grams, cups, tablespoons and ounces — accurate per ingredient, because a cup of flour and a cup of honey aren’t the same weight.
CPM Calculator
Calculate advertising CPM (cost per 1,000 impressions), or solve for the cost or impressions from the other two.
Density Calculator
Calculate density, mass or volume from the other two using ρ = m / V — units are yours to choose.
Dice Roller
Roll one or more dice (d4 to d20) online — see each die and the total, for board games and tabletop RPGs.
Dog Age Calculator
Convert your dog’s age to human years with a size-aware vet formula — far more accurate than the old “multiply by 7”.
Half-Life Calculator
Work out how much of a substance remains after a given time from its half-life (radioactive or drug decay).
HEX Color Converter
Convert a HEX color code to its RGB and HSL equivalents instantly.
Love Calculator
A fun compatibility score between two names — just for a laugh, not a real measure of anything.
MD5 Hash Generator
Generate the MD5 hash of any text instantly, computed on your device.
Pace Calculator
Calculate your running pace per km and per mile, plus speed, from distance and time.
Password Generator
Create strong, random passwords with your choice of length and character types — generated securely in your browser.
Random Number Generator
Generate random numbers in any range, with or without duplicates — for draws, picks and sampling.
Roman Numeral Converter
Convert between numbers and Roman numerals (1–3999), both directions.
Subnet Calculator
IPv4 subnet calculator — network and broadcast addresses, subnet mask, host range and host counts from an IP and CIDR prefix.
Time Card Calculator
Add up the hours worked in a shift from clock-in to clock-out, minus breaks, with optional gross pay. Handles overnight shifts.
Voltage Drop Calculator
Estimate voltage drop over a copper or aluminium cable run, with the percentage drop and the voltage at the load.
Word Counter
Count words, characters, sentences, paragraphs and reading time as you type — live, in your browser.