How many LEGO bricks are in 10 bulk pounds?

Why would I ask this…well…our 7-year-old LOVES LEGO bricks, but as you know, new sets can get expensive QUICKLY.

Best Gift

One of the best gifts my son EVER received was a bulk container of my childhood LEGO bricks from the 1980s. Grandad unpacked them from the garage and split the lot between his two grandsons for Christmas. (Check out our list of other great LEGO gifts for kids).


I spent several hours that day recreating sets from my childhood because my Dad saved the instruction manuals, too! My son loves that we have LEGO BASIC building guides.

Fast Forward…

We thought we could again benefit from a large bulk set of LEGO bricks to replenish our collection, so we recently turned to eBay. (We checked our local Facebook marketplace, but our area had few options for LEGOs). During our search, I kept seeing assortments listed as 10lb sets. I had no idea what brick count that might be, so I turned to good ‘ole Google.

eBay is a great resource for buying used bulk LEGO bricks

What did Google tell us?

Well, there was only one guesstimate, and it was over a decade old. We went with it (hey, it was in WIRED, after all) but decided to test this guesstimate as an upcoming elementary school science fair project (our scientific results are below).

WIRED magazine’s writer, Doug Cornelius, ran an experiment and wrote about it in his article, “Finding Lego Bricks in Bulk.”

What do you get when you order 10 pounds of Lego bricks? According to our barely scientific measurements, about 3,000 pieces.

Doug Cornelius,, written in 2009

What did my son’s science fair project tell us?

My son’s nine experiments estimated about 200 LEGO bricks per 1/2 pound. The range in his experiment was 71 to 258 bricks, making a median of 200 and an average of 182 LEGO bricks per 1/2 pound.

This means 10 pounds of LEGO bricks likely has much more than Doug’s guesstimate. Our calculations put the range closer to 3,640 or 4,000 LEGO bricks per 10 pounds.

Arts and Bricks bulk LEGO calculation, 2019

Our first bulk purchase was a complete success!

3K to 4K of LEGOs sounded like a good deal (about 300 or 400 LEGO bricks per pound), especially as you can purchase 10lb bulk boxes from $20 to $50 plus shipping costs.

Our son spent an hour or more sorting out all the NEW and VERY COOL pieces when the package arrived.

We heard:
and more…over, and over, and over!

Our bulk LEGO set included many complete LEGO Bionicles (now discontinued, LEGO Bionicles date from the early 2000s). As Bionicles were new to us, we didn’t know how to put them together, but again, Google served us well. We quickly located building instructions for 3 or 4 of the Bionicles included in our bulk set. Since this initial purchase, we’ve ordered several other Bionicle kits and made many Bionicle MOCs. Bionicles are one of recommended LEGO Gifts for Kids.

Shown: Bionicles, a LEGO product line launched in the early 2000s (an early subsidiary of LEGO’s Technic series).

Since this first purchase, we’ve requested additional bulk LEGO boxes for Christmas and birthday gifts. It’s always a thrill to see what treasures are in each box.

Counting LEGO bricks for an elementary school science fair project

Our inspiration for this science fair project was our first 5lb bulk LEGO purchase; my son was curious about how many bricks were in that 5 pounds of LEGO bulk goodness.

To answer this question, my son ran nine experiments. He used 8 ounces as the measuring amount and selected a variety of brick sizes for each 8-ounce grouping.

In these 9 experiments, he found an average of 182.5 LEGO bricks per 1/2 pound. This was calculated by taking the total number of LEGO bricks and dividing by the number of experiments: 1,642 LEGO bricks divided by 9. This gave us an average of 182.44 LEGO bricks per 8 ounces or 1/2 pound of LEGO bricks.

How many LEGO bricks are in 8 ounces? The premise for an elementary-age school science fair project.
How many LEGOs in eight ounces? – The question posed for an elementary school science fair project.

Another critical number: the median in this experiment was 200 LEGO bricks per 1/2 pound or 8 ounces.

For each 8.0 oz of brick, my son made piles of 10 bricks. This made counting and recounting easier and likely more accurate.

So, based on this science fair project’s results, you can expect the following number of bricks in a LEGO bulk purchase to approximately be:

  • 1/2 pound = around 200 bricks
  • 1 pound = around 400 bricks
  • 1.5 pounds = 600 LEGO bricks
  • 2 pounds = 800 LEGO bricks
  • 2.5 pounds = 1,000 LEGO bricks
  • 3 pounds = 1,200 LEGO bricks
  • 3.5 pounds = 1,400 LEGO bricks
  • 4 pounds = 1,600 LEGO bricks
  • 4.5 pounds = 1,800 LEGO bricks
  • 5 pounds = 2,000 LEGO bricks
  • 10 pounds = 4,000 LEGO bricks

Should you buy LEGO in bulk? Yes, we recommend bulk used LEGO brick purchases.

So, if you’re considering purchasing used LEGO sets in bulk, our advice is to go for it.

Our box was FULL of many very useful bricks for creating robots, animals, vehicles, and buildings, plus very unique pieces from the Bionicle sets.

Happy LEGO building (and shopping!).

Personalized Brick-Built Decorations

There must be a LEGO-loving individual in your household! We bet he/she would love to decorate with a personalized window or wall decal designed from his/her MOCs. Check out our custom and ready-to-buy brick-built designs.

Shop Arts and Brick’s Navy Ship LEGO MOC wall/window decal
Boy enjoying his LEGO-Brick Built Race Car wall decals
The brick-built decals shown above are the Racers – Car Wall Stickers. These LEGO MOC vehicles were built by a 7-year-old.

Free LEGO LIFE Magazine for Kids

Did you know LEGO sends out FREE magazines to kids ages 5 to 10 every quarter? This magazine is such fun LEGO fan mail. The LEGO LIFE magazine is definitely worth the time it takes you to sign-up.

Did you know LEGO sends out FREE magazines to kids ages 5 to 10 every quarter? This magazine is such fun fan mail. Definitely worth the sign-up.

Save this for Later – Pin it!

How many LEGO bricks are in 10 bulk pounds? Any guesses? Read on to find out our estimate of what you're getting when you make a bulk LEGO purchase.

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