Estimation games
Seven games that turn guessing numbers into something you can get better at. Some need a jar of sweets. One needs only your phone.
In every estimation game you guess a quantity and the closest guess wins. The good ones reward thinking over luck: counting a small part, using something you already know, then scaling up. If you want the method first, read how to estimate anything.
For a ready-to-use lesson, choose from 30 estimation questions for kids and students, with worked estimates and a ten-minute class plan.
1. The estimation jar
You need: A clear jar, small items such as sweets or buttons, paper slips.
Good for: Classrooms, parties, all ages.
- Fill the jar and let everyone look closely, without opening it.
- Each player writes a guess on a slip.
- Count the items together. The closest guess wins.
Tip: Count the items in one layer you can see, then count the layers. That turns a wild guess into a real estimate.
2. Fermi question rounds
You need: A list of Fermi questions, paper and pencils.
Good for: Older children, teams, adults.
- Read out a question that nobody could look up in their head, like how many golf balls fit in a school bus.
- Give teams a few minutes to break it into smaller guesses and multiply.
- Reveal the answer. Score teams by how many times they were off, not by the difference.
Tip: Ask teams to write their assumptions down. Comparing them is where most of the learning happens.16 Fermi questions with answers.
3. Estimathon
You need: 13 hard numerical questions, a timer, answer sheets.
Good for: Maths clubs, teams of 2 to 6.
- Teams have about 30 minutes to answer 13 questions.
- For each question, a team gives a range: a lowest and a highest value.
- A range that contains the true answer scores better the narrower it is. Every missed question makes the team’s score much worse, and the lowest score wins.
Tip: Teams can resubmit, so a wide safe range early and a narrower one later is a common plan.
4. Higher or lower
You need: Nothing. One person knows a number.
Good for: Car journeys, younger children.
- One player picks a real quantity they know, like the height of a local building.
- Others guess. After each guess, say “higher” or “lower”.
- Count how many guesses it takes to get within 10%.
Tip: The best players jump by multiplying and dividing, not by adding. From 100, try 1,000 or 10 before 150.
5. Guess it, then measure it
You need: A tape measure, kitchen scales, a timer.
Good for: Classrooms, science clubs.
- Pick objects around the room: the length of a desk, the weight of a bag, the time to walk to the door.
- Everyone writes an estimate first.
- Measure together and see whose estimate was closest.
Tip: Build personal benchmarks. Your hand span, your stride and a litre bottle make later guesses much easier.
6. Guess the price
You need: A shopping receipt or a few items with price labels hidden.
Good for: Families, all ages.
- Show an item and hide its price.
- Everyone guesses. Closest without going over wins, or simply closest.
- Total the whole basket at the end for a bonus round.
Tip: Guessing the total basket is a good lesson in how small errors add up or cancel out.
7. Oddly: Estimate and This or That
You need: A phone, tablet or computer. No download.
Good for: Anyone who likes a daily puzzle.
- Each question shows a curious scene and asks for one number, such as how many worker bees it takes to make a teaspoon of honey.
- Type your estimate. There is a calculator and no timer.
- See the answer, the working and the sources. Score up to 1,000 points for each question.
Tip: Estimate asks for a number; This or That asks you to pick one of two options. Each has a new five-question round every day. Play your first round of each game free, no account needed. A free account unlocks every round.Play both games free.
Why play estimation games?
Estimating is a skill you use all the time: how long a trip takes, whether a price looks right, how much paint a wall needs. These games give quick feedback, so you learn which of your guesses tend to run high or low. Scoring by how many times you were off, rather than by the difference, keeps small and huge numbers fair.
Questions about estimation games
What is an estimation game?
An estimation game asks players to guess a quantity, such as a count, a length, a weight or a time, and rewards the guess that comes closest. Good estimation games let you reason your way to a number instead of relying on luck.
What are good estimation games for kids?
The estimation jar, guess it then measure it, and higher or lower all work well with younger children because the answer can be counted or measured on the spot. Older children enjoy Fermi question rounds.
Is there a daily estimation game like Wordle?
Yes. Oddly has two games, Estimate and This or That. Each has a new round of five questions every day. Play your first round of each game free, no account needed. A free account unlocks every round.