Short Run Pro | Custom Countertop Brackets and Corbels

"My customer can’t say enough about how much she loves the bracket. They didn’t want a bracket that looks bulky or industrial, rather something that adds to the design of the contemporary kitchen. Thanks for the great design.."

Beam Deflection
Granite Countertop Weight

Beam Deflection Calculator

No bracket will remain perfectly straight under even the lightest load. Even if a feather were placed on a 1/2” steel plate, the plate would bend under the weight. The bending would, however, be too small to notice and the plate certainly wouldn't be in any danger of failing.

This calculator uses engineering beam theory to predict the deflection of a bracket under a given amount of weight. This is not intended to be a perfect representation of the behavior of a bracket under a load. It is only a tool to help you get an “idea.” There are several assumptions and simplifications that have been applied. Whenever possible we tried to make these assumptions as a “worst case scenario.”

Assumptions:

1) The bracket will be supporting the entire weight of the countertop. In most applications, the countertop is overhung, with the main body of granite being supported by a knee wall or cabinet. When this is the case, the rigidity of the granite provides extra support so that the bracket is only supporting a fraction of the overhung weight.
2) The bracket is ungusseted. A gusset adds significant strength to a bracket, but makes the calculations much more complex. This calculator is not a good indicator of the strength of a gusseted bracket.
3) The bracket has no holes in the top. Holes weaken the bracket slightly but this is nearly always a negligible difference.

Simplifications:

1) The bracket is treated as a cantilevered beam. The difference between a bracket and a cantilevered beam is shown below. Because of this simplification, this calculator does not account for any bending that may take place on the vertical leg.

Using the Calculator:

1) Material. Choose Steel or Aluminum.
2) Load. This is the amount of weight the bracket will be supporting. You can calculate the weight of your granite overhang using our Granite Calculator. If you are using multiple brackets to support your granite, divide the total weight by the number of brackets.
3) Length. Length of the bracket's horizontal leg.
4) Width. Width of the bracket's horizontal leg. This is usually 2 inches.
5) Thickness. Thickness of the bracket material. A thicker bracket is much better at supporting heavier loads.

Deflection

1) Distributed load. This is the value that is of concern in most applications. This is when the weight (entered in “Load” above) is spread out over the entire length of the bracket.
2) Point load at end. This assumes that all of the weight (entered in “Load” above) is at the very tip of the bracket.

Calculator

Material:
Load:	pounds
Length:	inches
Width:	inches
Thickness:	inches

Short Run Pro provides this Beam Deflection Calculator as a service to website users. As previously stated there are assumptions and simplifications included in the calculations and therefore this service will not be able to calculate specific applications to exact accuracy. Calculations derived by use of this service may be used to determine deflection in general, but should not be relied upon in a user's specific application.
Results:
Distributed Load:	inches
Point Load at End:	inches

Distributed load deflection =

Point load deflection =

E= Modulus of Elasticity (in pounds per square inch)
I= Moment of Inertia (in inches^4)
W= Load (in pounds)
l= The length of the bracket (in inches)

Granite Countertop Weight Calculator

Welcome to Short Run Pro's Countertop Weight Calculator page. This page is intended to assist users in determining the weight of their granite countertops. The results provided by this calculator are derived from the information you provide on your countertop's dimensions.

Our engineers have developed this calculator to be of assistance to you in determining how much weight will be supported in your granite countertop installation. The calculations performed use the average density of granite (0.095 lbs/in^3). This is then applied to the data you enter and a total weight for your granite countertops is derived.

This Granite Countertop Weight Calculator is specifically developed for Granite counters. The calculator should not be used for determining weights on other solid surface counters or countertops made from other materials. The calculator provides general weight results and is not intended to advise on specific countertop applications.

Calculator

Length:	inches
Depth:	inches
Thickness*:	inches
Additional Weight**:	pounds

Short Run Pro provides this Granite Countertop Weight Calculator as a service to website users. As previously stated there are simplifications included in the calculations and therefore this service will not be able to calculate specific applications to exact accuracy. Calculations derived by use of this service may be used to determine granite countertop weights in general, but should not be relied upon in a user's specific application.

Results:

Total Weight:	pounds

NOTE:
*Standard countertop thicknesses are 0.75" and 1.25"
**Additional Weight is significant weight that you expect to be on the counter aside from the counter itself (i.e., appliances, body weight, etc.)