Units

Get information about and conversions for a unit:

foot pound

Get unit conversions for a quantity:

120 meters

Convert to a specified unit:

20mL in drams

Do a calculation with units:

10 miles + 14 kilometers

Compare two quantities:

175lb vs 100kg

Measurement Devices

Discover how to measure different physical properties:

acceleration measuring devices

Discover what different devices measure:

what does a ruler measure

Industrial Measures & Standards

Get information about a wire gauge:

AWG 18

Get dimensions of a screw or bolt:

1/4 inch bolt

Compute the volume of paint required to cover an area:

1500 sq ft primer

Fashion Sizes

Compute ring size equivalents:

ring size 8

Convert ring size to a specified system:

what is the french equivalent ring size to ring size 2?

Compute shoe size equivalents:

U.S. women's size 5 shoe

Convert shoe size to a specified system:

U.K. men's size 11 shoe in Japanese size

Packing & Covering of Objects

Estimate the number of objects required to fill a container:

How many baseballs fit in a Boeing 747?

Estimate the number of objects required to cover a specified area:

pennies to cover 2 square miles

Estimate the number of objects required to circle another object:

How many grains of rice would it take to stretch around the moon?

Physical Quantities

Get information about a physical quantity:

energy

enthalpy

Compare physical quantities:

magnetic induction, magnetic field strength

Compute a dimensionless quantity:

Reynolds number

Get information about a theorem in dimensional analysis:

Buckingham pi theorem