Family & Fun

Kids Calculator

A big, colourful, friendly calculator for children to practise the four basic operations.

Base Ten Blocks

Visual addition and subtraction with base ten blocks — see regrouping and borrowing step by step.

Number Line

Visual addition and subtraction within 20 — a friendly frog hops each step.

Fraction Pizza

Build, compare and find equivalent fractions by tapping slices of a pizza.

Telling Time

Learn to read an analog clock: drag the hands to explore, then take a leveled quiz.

Greater Than, Less Than

Compare numbers with the hungry-crocodile game — pick greater than, equal to or less than.

Dog Food Calculator

Estimate how much to feed your dog from its weight, life stage and food.

Cat Food Calculator

Estimate how much to feed your cat from its weight, life stage and food.

Dog Years Calculator

Convert your dog's age to human years by size, with the science-based estimate too.

Cat Age Calculator

Convert your cat's age to human years with the standard feline chart.

Litter Box Calculator

How many litter boxes you need with the one-per-cat-plus-one rule.

Dog Pregnancy Calculator

Your dog's likely whelping date from the mating date.

Cat Pregnancy Calculator

Your cat's likely kittening date from the mating date.

Horse Age Calculator

Convert your horse's age to human years.

Rabbit Age Calculator

Convert your rabbit's age to human years.

Aquarium Size Calculator

Tank volume and fish capacity from its dimensions.

Chickens for Eggs Calculator

How many hens you need for the eggs you want.

Pace Calculator

Convert between running pace, time and distance.

Race Time Predictor

Predict your race time at any distance from a recent result (Riegel).

One-Rep Max Calculator

Estimate your 1RM from a set of reps, with training percentages.

Calories Burned Calculator

Calories burned by activity from your weight and duration (METs).

PRO

World Cup 2026 Players Countdown

From 1,248 players to a single champion: see how many are left at each round.

Countdown Calculator

A live countdown to any date and time — days, hours, minutes, seconds.

Wedding Budget Calculator

Estimate a wedding total from guests, catering, venue and extras.

Party Drinks Calculator

How many drinks to buy for a party, split into beer, wine and spirits.

Event Food Calculator

How much food to serve at an event from guest count and type.

Numerology Calculator

Life Path, Destiny and Soul numbers from your birth date and name.

Zodiac Compatibility Calculator

Zodiac signs of two dates and an element-based compatibility score.

Day of the Week Calculator

What day of the week any date fell on, plus how many days ago.

Big Number Calculator

Turn huge amounts of time into a real date from today.

Relationship Calculator

How long you've been together, down to the day, with your next anniversary.

Binge-Watch Calculator

How long to finish a series, in hours and days.

Chinese Zodiac Calculator

Your Chinese zodiac animal and element by birth year.

Name Compatibility Calculator

The classic FLAMES name game — just for fun.

PRO

Interplanetary Travel

Pick a planet and a speed and watch a ship make the trip — the time reveals on arrival.

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Hail Mary Interstellar Travel

How long to reach the stars of Project Hail Mary — Tau Ceti and Erid — at different speeds, with an animated ship.

Reading Time Calculator

How long a text takes to read, silently or aloud.

Dice Probability Calculator

Exact odds of rolling any sum with any dice.

Lottery Odds Calculator

Your real odds of hitting a lottery jackpot.

Space Travel Time Calculator

How long to reach the Moon, Mars or the stars at any speed.

Celebrity Net Worth Calculator

The fortune of famous people, compared to yours.

Chinese Gender Predictor

Boy or girl, the traditional Chinese way — just for fun.

PRO

Your Age on Other Planets

How old you'd be on Mercury, Mars or Neptune, with an animated solar system.

Daily Number Puzzle

Reach 24 using four numbers and + − × ÷ — a fresh brain teaser every day.

Screen Time in Perspective

See what your daily screen time adds up to over years — in movies, books and more.

Baby Name Generator by Numerology

Baby name ideas whose numerology number, with your surname, matches a quality you pick.

4th of July Countdown

Live countdown to US Independence Day, with an animated flag. Rolls over to next year automatically.

Argentina Independence Day Countdown

Live countdown to the 9 de Julio, Argentina's Independence Day.

Brazil Independence Day Countdown

Live countdown to the 7 de Setembro, Brazil's Independence Day.

Christmas Countdown

Live countdown to December 25 with falling snow and a lit tree.

New Year Countdown

Live countdown to January 1. Rolls over to the next year automatically.

Thanksgiving Countdown

Live countdown to the fourth Thursday of November, recalculated each year.

Mexico Independence Day Countdown

Live countdown to the 16 de Septiembre, Mexico's Independence Day.

Colombia Independence Day Countdown

Live countdown to the 20 de Julio, Colombia's Independence Day.

Chile Fiestas Patrias Countdown

Live countdown to the 18 de Septiembre, Chile's national day.