MetricMaster

MetricMaster is a measurement unit conversion calculator containing over 2,000 metric/S.I., imperial, U.S. conventional, and other units in its database, most to 14 digit precision. Use it to convert units of length, area, distance, volume, time, temperature, power, charge, heat transfer, and over 100 other types. New units can be added and unwanted ones removed. Supports compound units such as feet/inch/fractions, scientific notation and control of significant digits. MetricMaster can also convert currencies, clock times, and many physical constants, and has 600 definitions in its database.

Requirements:

Mac OS 6.0.4/7.x/8.x/9.x/X

Limitations:

50-use trial, see description