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Vintage pre 1950’s (based on the phone number) Concrete Calculator. The rule is in excellent condition with no cracks or stains. Measures 6 8/16th W X 1 2/16th H inches when closed.

This ruler calculates/estimate the concrete yards required to fill an area. It was used to calculate concrete yardage required for cylinders, piers, circular and rectangular slabs. Unit is made of heavy duty plastic. Easy instructions are printed directly on the back of the slide rule. This is a very nice collectible marketing giveaway from the 1950's from “Walnut Creek Aggregates Co. Ready Mix Concrete”. The lover of industrial ephemera will love the simplicity of this beautiful little slide rule from the mid-century concrete block boom.

Ship to lower 48

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Happy customers said this:

**** Very happy with this purchase. Books were in good condition and were as described. Seller shipped them within a day of receiving my order. Very efficient, would definitely purchase from this seller in the future. I used to read these books as a child; I can't wait to read them now with my daughter!

**** A++ buying experience. Safe speedy shipping. Thank you

**** First time getting a comp. doll, very happy with purchase. She is so cute!!! Fast delivery and the way she was wrapped was very nice!!!

**** Shipped and received quickly, item as described. Love it! Great item at a great price. Recommended seller.
**** One of the best purchases I have ever made. Will always be checking out this store.

Concrete Calculator Slide Rule Vintage Pre 1950’s


Only 1 available


  • Vintage item from the 1950s
  • Materials: Plastic, Slide Rule, Concrete Calculator, Read Mix, Metric Rule
  • Ships worldwide from United States
  • Feedback: 56 reviews
  • Favorited by: 1 person