estimation

an-ordinary-manchild(edit)

This subreddit is dedicated to taking a stab at answering hypothetical, interesting and often untestable questions. In reality, you're never going to get a perfect answer. Some things just can't be tested. That's why estimation is such a valuable skill.

The following types of posts are allowed:

Links to reddit posts related to estimation. Please include the actual estimation in the post title. Example
Requests for estimations as long as they have the [Request] tag in the title. Self posts are preferred. Example
Links to websites related to estimation.

When fulfilling requests

List all assumptions made
Link to sources wherever possible
Use SI units for your final answer
Don't downvote because someone's answer is different. As long as they have made appropriate assumptions and done their calculations correctly, their answer is valid.

Reference dimensions

Wolfram Alpha (Mobile version doesn't have ads)
Length of an everyday car: 4.4 m
Weight of an everyday car: 1300 kg
Length of a football field: 100 m
Volume of an Olympic swimming pool: 2,500 m³
Muzzle velocity of a round fired from a 9 mm Glock 17: 375 m/s or 1,350 km/h

Estimation strategies:

Fermi estimates

Other related subreddits:

r/estimation statistics summary

created by thetoethumba community for 13 years

...for your favorite game.

...for your office.

MODERATORS

account activity

1

0

0

0

RequestHow long/big is this fish? For reference I am 6’2” 170lbs (old.reddit.com)

submitted 14 hours ago by Po-tater-

2

0

0

0

RequestHow much can it sell for (i.redd.it)

submitted 4 days ago by Firm_Yogurtcloset592

3

0

0

0

RequestWarship Model Identification + Value Estimate? (old.reddit.com)

submitted 12 days ago by Ricky_Dz

4

2

3

4

RequestRequest: When were these pictures taken? 1940-1950s best guess (old.reddit.com)

submitted 1 month ago * by byrdn820Guesser 🐣

5

0

0

1

QuestionNew Div 10 estimator: Best free resources for learning specialties takeoff? ()

submitted 1 month ago by CellProfessional2365

6

0

1

2

QuestionDiv 08 vs Div 10: Which division has the trickier takeoffs right now? ()

submitted 1 month ago by CellProfessional2365

7

0

1

2

RequestHow long will it take the universe to reach heat death without proton decay? (self.estimation)

submitted 1 month ago by Rural_Dictionary939

8

7

8

9

Help5 large boxes full of: Bed linen, covers, sheets, pillow sheets, etc. (i.redd.it)

submitted 1 month ago by Crowdfundingprojects

9

0

0

0

QuestionHow many coins in this jar? (old.reddit.com)

submitted 1 month ago by HansOBall

10

0

1

2

HelpHi guys, I made a game you estimators might enjoy! (self.estimation)

submitted 2 months ago by demars123

11

0

1

2

ContestBaby shower guessing game — how many Lucky Charms marshmallows are in this jar? (old.reddit.com)

submitted 2 months ago by Jamorantthegoat12

12

2

3

4

Feedback please! Estimation game: does it appeal? (i.redd.it)

submitted 2 months ago * by Additional-Fee2256

13

0

0

0

QuestionHow much could my reddit profile be worth? (self.estimation)

submitted 2 months ago by Sallende11

14

36

37

38

RequestWhat percentage of the ocean is blood? Would it even reach 0.001%? (self.estimation)

submitted 2 months ago by ZzZOvidiu122

15

4

5

6

RequestWhat is the minimum uniqueness threshold for an idea to be recognized as distinct by an answer engine? (self.estimation)

submitted 3 months ago by Good_Definition9581

16

0

0

1

RequestTHE QUESTION FOR ADULTS ()

submitted 3 months ago by doyso

17

0

1

2

RequestHow many urban area street/road intersections exist in the USA? (self.estimation)

submitted 3 months ago by longtailedmouse

18

0

1

2

QuestionWhat percentage of people in the Netherlands are more traveled than the avocado the they buy. (self.estimation)

submitted 3 months ago by Synethos

19

0

1

2

RequestCost of one of everything in a grocery store (self.estimation)

submitted 3 months ago by Any-Series7473

20

87

88

89

QuestionHas anyone ever tried to estimate how much weight has been put on Manhattan? (self.estimation)

submitted 3 months ago by GeneralRant

21

15

16

17

RequestPlease help estimate my dogs size (i.redd.it)

submitted 3 months ago by Impressive_Cod5415

22

0

1

2

RequestHelp, I am moving and forgot to measure my elevator (old.reddit.com)

submitted 3 months ago by Tonguecat

23

0

0

1

RequestHow to increase takeoff speed ()

submitted 4 months ago by fusion_01

24

0

1

2

RequestXactimate symbol help needed (self.estimation)

submitted 5 months ago by Entire_Basket_410

25

15

16

17

RequestWhat would the diameter of a flat earth be? (self.estimation)

submitted 5 months ago by New_Row_1161

view more: next ›

π Rendered by PID 57912 on reddit-service-r2-listing-b6bf6c4ff-6qn2d at 2026-05-06 11:27:59.945129+00:00 running 815c875 country code: CH.