
 DNA strand length
Approximate MWt, length, and number of turns. (32%)
 Rectangles and squares
Area and diagonal length and angle. (29%)
 Length and distance
Metric, imperial, archaic, and other units. (26%)
 Lens strength
Conversion between focal length and dioptres. (26%)
 Kolmogorov microscales
Finds length, time and velocity. (25%)
 f/#, NA, and spot size
From focal length and aperture size. (24%)
 Regular pentagon
Area and lengths from side length. (24%)
 Flow in pressurized pipe
Pressure drop by HazenWilliams equation. (24%)
 Platonic solids
Gives volumes based on side length. (17%)
 Volume of prisms
The volume of any prismatic solid. (17%)
 Cuboids and cubes
Cuboid volume, surface area, and more. (16%)
 Cylinder properties
Cylinder surface area and volume. (15%)
 Absorption coefficient
Molar extinction coefficient or crosssection. (15%)
 Add two vectors
Or subtract. Result in polar and Cartesian forms. (15%)
 DarcyWeisbach formula
Pressure drop in a circular pipe. (15%)
 Volume resistivity
From sample dimensions and resistance. (15%)
 Cone properties
Cone volume and surface area. (15%)
 Thermal expansion
From temperature change and CLTE. (14%)
 Triangle from three sides
Angles and area from all side lengths. (14%)
 Solenoid properties
Inductance and magnetic Bfield. (14%)
  
 