Fun calculators

Calculators that don't pretend to be useful. For when you want a number to settle an argument, amuse a child, or make a podcast joke land properly.

What "fun calculators" are actually for

Strictly speaking, you do not need any of these. You can flip a coin with an actual coin, roll a die with an actual die, and work out how many months old your toddler is using the calendar app on your phone and a small amount of muttering. The argument for a browser tool is that it is faster, fairer, and you do not have to find the bloody dice.

That sounds glib, but there is a real point underneath it. Random selection done in your head is rubbish. People accidentally pick the same name every time, default to the option on the left, or get nudged by who they were looking at when they decided. A tool that pulls from the browser's cryptographic random source removes that bias completely. So if you are picking a name out of a hat, allocating teams in a classroom, or deciding which child empties the dishwasher, the wheel is genuinely fairer than your gut.

Where the inputs come from

For most of these tools, the input is whatever list you happen to have in front of you. A few practical pointers anyway:

  • Names and options. Paste them one per line into the Random Name Picker or the Decision Wheel. Trim the whitespace, drop blank lines, and check spelling: nobody enjoys being eliminated because their name had a typo.
  • Dice notation. The Dice and Coin Roller understands standard tabletop notation: 2d6, 1d20+5, 4d6kh3 (roll four six-siders, keep the highest three). If you grew up on Dungeons and Dragons this will feel like coming home. If you did not, the help text on the page walks you through it.
  • Dates. Any of the date tools will accept a date in your locale's format. The age in months one is the calculator parents of small children apparently cannot live without, mainly so they can say "fourteen months" instead of "just over a year" with a slight air of authority.

Common mistakes people make with random tools

The big one is assuming "random" means "fair feeling". It does not. A genuinely random sequence of coin flips will produce runs of five or six heads in a row, and people then conclude the tool is broken. It is not broken. Real randomness clusters. If you want guaranteed alternation, what you actually want is a rota, not a coin flip.

The other one is using a Magic 8-Ball or a decision wheel to "make" a decision you have already made. The proper use of a randomiser, traditionally, is to spin it and notice how you feel about the answer. If you are gutted, you wanted the other option. Now you know. The Magic 8-Ball is almost entirely useful as a feelings detector, which is a perfectly respectable thing for a toy from 1950 to be doing in 2026.

What is coming next

This category grows when something obvious is missing. Birthday paradox, password silliness, a "how many of X fit in your living room" tool, a name combiner for fictional couples: any of these may show up. If you have a request, the contact page is the place. We will not put anything in here that pretends to be useful when it is not. Honest fun beats dishonest utility.

  • Age in Months Calculator

    Enter a date of birth and find out how many months old you are. As popularised by parents of small children everywhere, who communicate their offspring's age exclusively in this way.

  • Date Difference Calculator

    Pick two dates. Get the gap in years, months, days, weeks, hours and weekdays. Useful for deadlines, anniversaries, and any other "how long?" question that comes up on a Monday morning.

  • Random Name Picker

    Paste a list of names, choose how many to pick, get a fair random selection. Useful for classroom call-outs, raffle draws, fair team allocations, or settling a decision when nobody can agree. Browser-only and cryptographically unbiased.

  • Dice and Coin Roller

    Roll any combination of tabletop dice or flip up to 1000 coins. Standard notation including 2d6, 1d20+5 and 4d6kh3. Browser-only, with the working shown so the result is auditable.

  • Decision Wheel

    Type a list of options and spin a coloured wheel to pick one. Optional remove-winner mode for tournament-style elimination. Browser-only and cryptographically unbiased.

  • Magic 8-Ball Generator

    Ask any yes/no question. The classic 20-answer oracle, with 10 affirmative, 5 non-committal and 5 negative answers, weighted exactly like the original toy. Browser-only, uses Web Crypto for an unbiased draw.

Frequently asked questions

Are these random pickers actually fair?

Yes. Every randomiser uses the browser's `crypto.getRandomValues()` API, which is the same source of randomness used for cryptographic keys. The maths gives every name, number or option an equal chance on every spin. No weighting, no house edge, no quietly favouring the first option in the list.

How does the Decision Wheel decide?

You enter the options, the wheel picks one at random with equal probability. The visible spin animation is just for fun: the answer is chosen the moment you click. The Decision Wheel is honest about this in the Show workings panel.

Can I use these for a real raffle or prize draw?

For low-stakes office, classroom or party draws, yes. For anything with a meaningful prize or legal requirements (UK Society Lottery, paid raffles), use a regulated draw service that publishes audit logs. The Random Name Picker on this site does not log anything, which is great for privacy and useless if you ever need to prove the result was fair.

Is the Magic 8-Ball actually random?

Yes, picked uniformly from the standard 20 answers. The classic version weights "yes" answers more heavily than "no" or "ask later" (10 affirmative, 5 non-committal, 5 negative). The Magic 8-Ball here keeps that distribution.

How is "age in months" different from age in years?

It is the same age, expressed in finer-grained units. Useful for parents tracking developmental milestones (which are quoted in months for the first two years), for music exam grading, and for anyone who wants a more honest number than "37". The Age in Months Calculator also returns days, hours and minutes if you want to feel ancient.

Why "fun"?

Most calculators on this site exist because someone, somewhere, needs the number and Google sent them looking for it. Fun calculators are the opposite: nobody needs the answer. You might enjoy it anyway. That is the entire pitch.

Expect this page to grow. The internet has been home to silly calculators since approximately 1996, and we are happy to keep that tradition alive.