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The Construction Master Pro Model 4065 is a professional-grade construction calculator designed to handle complex dimensional math with ease. It supports multiple unit formats including imperial and metric, offers specialized functions for layouts, roofing, stairs, and angles, and helps reduce costly material waste. Built tough with a shock and moisture-resistant case, it’s powered by long-life batteries and backed by a one-year warranty, making it an indispensable tool for estimators, builders, and carpenters aiming for precision and efficiency on every project.










| ASIN | B0007Q3RGQ |
| Best Sellers Rank | 36,036 in Stationery & Office Supplies ( See Top 100 in Stationery & Office Supplies ) 72 in Scientific Calculators |
| Brand Name | Calculated Industries |
| Calculator Type | Construction/Building |
| Colour | Silver |
| Compatible Devices | Calculator |
| Country of Origin | China |
| Customer Reviews | 4.7 4.7 out of 5 stars (4,675) |
| Display Type | Digital |
| Enclosure Material | Plastic |
| Global Trade Identification Number | 00098584040659 |
| Item Dimensions L x W | 14.6L x 7.6W centimetres |
| Item Weight | 0.51 Pounds |
| Manufacturer | Calculated Industries |
| Manufacturer Part Number | 4065 |
| Model Name | 4065 |
| Model Number | 4065 |
| Number of Batteries | 2 LR44 batteries required. (included) |
| Power Source | Battery Powered |
| Product Warranty | 1 year warranty |
| Screen Size | 2.6 Inches |
| UPC | 796084327231 787718482709 702658630553 098584000295 767872160125 780320411143 098584040659 700580266321 733353104988 |
| Unit Count | 1.0 count |
C**N
So useful
I am really glad that I bought this and relieved that I could buy it in the UK. If you work in construction it would make your life easier. It takes some getting used to the range of functions however if you are a joiner the stair function and traditional cut roof functions are great. You can input metric or imperial although the inputs are more logical when done in imperial and use the American phrases for roofing and framing. It has a good instruction booklet however the you tube channel is the best resource. The quality seems to be very good but came with a tough case too. Well worth the money.
C**B
Good purchase
Does exactly what it says it will. Really helpful
A**W
Construction master
Great item as described
D**E
It' Fantastic.
i had looked at this calculator for a long time before I made my decision to bye. After watching "This is carpentry" on U Tube the decision was made for me.
P**B
Construction Master Pro
My only criticism is with the plumb and cheek calculations for rafters. The plumb cut is given the same as the pitch when of course it should be 90 degrees less the pitch - eg. a 20 degree pitch would give a plumb cut of 70 degrees. The construction master would give the plumb cut as 20 degrees the same as the pitch angle. Also the cheek cuts for the hip and jack rafters are always given as 45 degrees which is correct for the plan view on the horizontal plane but not the actual cut.
C**Y
Great addition to the toolbox
Used the calculator to work out a roof it was a great help worked out in no time to perfection.
M**S
How have I lived without it
Once mastered, an absolute must for builders, Architects, DIY’ers, Planners etc
W**Y
A1
Saved me a lot of time a1
E**S
great unit for work
J**G
Very useful in framing works.
E**A
Un mio collega possiede il modello precedente di questa calcolatrice e, dopo aver provato la sua ed averne constatato l'enorme utilità, mi sono decisa ad aquistarla a mia volta. Il prezzo è forse un po' alto, ma la facilità con cui ora riesco a gestire conversioni, somme e computi metrici per offerte è impagabile. Inoltre, guardando il libretto di istruzioni, sto scoprendo tutta una serie di funzioni che costituiscono certamente un valore aggiunto. La confezione, al posto del guscio di plastica standard, includeva un bonus, ovvero la custodia protettiva "armadillo gear". Questo accessorio temo che in realtà abbia notevolmente influito sul prezzo di vendita - la stessa calcolatrice, infatti, se acquistata in un negozio fisico negli US ha un costo di gran lunga inferiore. Ma io non volevo aspettare di andare ad acquistarla direttamente e comunque l'idea di una cover protettiva mi sembrava un'ottima cosa per proteggere la calcolatriche da danni da caduta quando sono fuori ufficio. E questa copertura in gomma effettivamente protegge la calcolatrice da qualunque tipo di urto, peccato però che ne aumenti l'ingombro in maniera quasi eccessiva, rendendo impossibile di fatto il trasporto in tasca. Inoltre, la custodia è larga e raccoglie quindi ogni tipo di residuo e polvere; il gancio dello sportello, infine, rende difficile poterlo aprire e si deve sempre operare con due mani. Quindi, questo mi impedisce di utilizzarla per lo scopo per cui è stata acquistata - ovvero una gestione facilitata anche durante le fasi di lavorazione. Dato il costo, ho ovviamente cercato di acquistare la cover standard separatamente (ora devo rimuovere lo scudo protettivo quando sono in posti senza piani di appoggio confortevoli) per avere una protezione seppur minima proprio nelle occasioni che contano, ma senza fortuna. Non posso quindi dirmi completamente soddisfatta. L'oggetto in sé è ottimo con perfette funzionalità ed un funzionamente intuitivo, ma l'imposisiblità di fruirne come pianificato ne diminuisce l'utilità.
D**.
La facilidad de hacer y calcular ángulos en la construcción. La uso para verificar ángulos y mediciones y cálculo de materiales en la construcción de una casa. Apenas empiezo a utilizarla, pero sin duda aún tiene muchas cualidades que conocer y utilizar. Su manual es de gran ayuda.
K**N
I’ve had this construction calculator for a while now and absolutely love it. I use it most often for roof pitch calculations and for confirming square, and it’s been consistently accurate. Once you get the hang of how it works, it’s quick, easy, and very efficient. It really saves time compared to doing everything manually or double-checking with other methods. One project where it really stood out was laying out a rake wall with studs at 16 inches on center. The calculations made it easy to get perfect saw cuts so everything nailed up cleanly and matched the pitch exactly. I would definitely recommend this calculator for any construction use. It’s a great tool that earns its place on the jobsite.
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