How Heavy Is a Cinder Block?
a Cinder Block weighs about
18.1 kg (40 lb)
Typical range: 13.6 kg – 18.1 kg.
- a cinder block18.1 kg
standard 8x8x16 in hollow concrete block (actual 7-5/8 x 7-5/8 x 15-5/8 in), Basalite medium weight, example product Basalite 8x8x16 Standard
- a bowling ball7.26 kg
heaviest ball allowed in tenpin bowling (16 lb); USBC sets no minimum weight
- a domestic cat4.5 kg
adult domestic cat (Felis catus); males larger; range 4.1–5.4 kg
- a gallon of water3.78 kg
1 US gallon (3.785 412 L) of pure water at 4 °C
- You
Open full comparison → to add more objects on one scale.
Put it in perspective
- About 2.5× a bowling ball
- About 4.0× a domestic cat
- About 4.8× a gallon of water
Why weights differ
Weight varies by weight class: lightweight 8x8x16 blocks run about 28-32 lb (13-15 kg); 40 lb is a medium-weight unit.
Sources
[1] Basalite Concrete Products
Building Blocks — Specifications (Washington region cut sheet)Manufacturer
“8x8x16 Standard (Smooth or Split Face) 7-5/8” W x 15-5/8 L x 7-5/8” H ... Weight ... 40 lbs”
Value as published: 40 lbs · accessed 2026-11-11.
Last updated 2026-11-11.Report a correction (please include a source link).
Related objects
- a bag of cement94 lb (42.64 kg)
- a ream of paper2.5 kg (5.51 lb)
- a brick2 kg (4.41 lb)
- a 13-inch MacBook Air1.23 kg (2.712 lb)
- an iPhone 16170 g (5.997 oz)
Frequently asked questions
How much does a cinder block weigh?
a Cinder Block weighs about 18.1 kg (40 lb) — standard 8x8x16 in hollow concrete block (actual 7-5/8 x 7-5/8 x 15-5/8 in), Basalite medium weight, example product Basalite 8x8x16 Standard.
How much is a cinder block in pounds and ounces?
40 lb, which is 640 oz. In metric terms: 18.1 kg.
Is a cinder block heavier than a bowling ball?
Yes. a Cinder Block weighs about 18.1 kg (40 lb), while a bowling ball is about 16 lb (7.26 kg) — roughly 2.5×.
Why do sources give different weights?
Weight varies by weight class: lightweight 8x8x16 blocks run about 28-32 lb (13-15 kg); 40 lb is a medium-weight unit.
Where does this number come from?
Every source is listed at the bottom of this page with publisher, link, access date and a verbatim quote. Numbers are only published when a qualifying source can be verified.