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This tool calculates flux density on the centerline of the magnet, at a distance of X from the surface of the magnet. (X must be greater than 0.)

(For your convenience, you can compare 2 magnets here.)

Scroll left and right
Inputs Magnet 1 Magnet 2  
Length Distance can be input in any units of measure as long as they are consistent to each other.
Width
Thickness*
Distance X
Br (Gauss) Must be entered in gauss units.
Gauss at X

Results are in gauss.
     
*This is the orientation direction (the magnetic field flows through this direction)