FREE Online Measurements Converters and Calculators
  Online Calculators - Online Converters - Unit Measurement Translators
Metric <-> Imperial <-> Metric

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This calculator can do everything! Besides the basic functions: add, subtract, multiply, and divide, it can take the reciprocal, cos, sin, and tan of a number, square root, and has special square and cube buttons. Also does any power of a number you want, and looks great at the same time.