China Neodymium And Ferrite Magnets Manufacturer & Supplier 
Regardless of which magnet material, round and square are the most popular, some users would like to know which of these 2 magnet shapes is more magnetic, permanent magnet manufacturer Courage Magnets Xiao Fu to introduce you to the next.
In general, there is no fixed rule to directly compare the magnetic strength of round and square magnets. The strength of the magnetic force depends on factors such as the magnet's material, size, shape, magnetization method, and the environment in which it is placed.
The accompanying image below shows a rectangular block neo magnets
The magnetic force of a round magnet and a square magnet may differ for the same material and size, but this depends on the specific design and manufacture of the magnet. Some round magnets may have a stronger magnetic force, while in other cases, square magnets may be stronger.
The best way to determine the magnetic strength of two magnets is to actually measure them with a magnetometer or other device that specializes in measuring magnetic field strength.
Whether you choose a round or square magnet depends on the specific use and design requirements you need, and both shapes have their own advantages and characteristics.
Circular magnets are often more useful in the manufacture of certain rotating machinery or sensors because they are designed to be more easily embedded in a circular configuration and because circular magnets provide a uniform magnetic field.
Square magnets, on the other hand, may be easier to install and secure in certain situations because they have flat surfaces and straight edges, making them suitable for use in certain mechanical constructions or fixed locations where a magnetic field is required.
Therefore, the choice depends on the specific application scenario and need. If you need to embed or install in a particular shape structure, consider the most suitable magnet shape for that structure. If you need a specific shape of magnetic field distribution, you can also choose the appropriate magnet shape based on this need.
Note: Since a circle has a larger area than a rectangle for the same perimeter, you will get a stronger magnet for the same magnet weight by choosing a circle magnet than a rectangle magnet.
More about magnet strength introduction;
4 types of magnets [strengths uses picture]