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Online Calculators and Converters: Calculators


  • Includes general and scientific calculators; currency, mortgage, lease and loan calculators; and time, temperature, unit, area, and measurement converters.

Martindale's Calculators On-Line Center

  • Includes calculators of agriculture, archeology, astronomy, bioscience, chemistry, engineering, geoscience, mathematics, meteorology, physics, radiation, and statistics.

IRS Withholding Calculator

  • Calculate and estimate withholding taxes. Useful for tax preparation and W-4 preparation.