Here are a few more general metric conversion calculators, most of which you would rarely have use for in a kitchen, unless it was under construction.
Distance & Length Metric Calculator - converts meters, millimeters, inches, feet, yards, miles, kilometers, centimeters
Area Metric Calculator - converts square meters, square millimeters, square inches, square feet, square yards, square miles, square kilometers, square centimeters
Volume Calculator - converts liters, fluid ounces, quarts, gallons, cubic feet, cubic yards, cubic meters
Metric To U.S. Weights Calculator - converts kilograms, ounces, pounds, troy pounds, stones
Metric Weight Calculator - converts kilograms, ounces, pounds, English tons, metric tons
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Metric Calculator