Online Reference Tools: Calculators/Conversion

Currency, mortgage, retirement and 401 (k) savings calculators.

Convert money from one currency to another using current exchange rates.

Online conversions calculator for a variety of unit measurements featuring natural language queries.

Weights and measures conversion.

Graphing calculator from e-Tutor.

A collection of calculators for the sciences, business and everyday measurements. Organized by subject area.

Trigonometry, matrices, complex numbers, unit conversion and more.

Inflation calculator from the Federal Reserve Bank of Minneapolis.

Computational knowledge engine.