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Practical & Physics
Everyday practical calculators: exact age, electricity cost, map scale, and Ohm's law.
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Exact Age Calculator
Calculate your exact age in years, months, days, hours, and minutes.
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Appliance Electricity Cost
Estimate annual power consumption costs for any electrical appliance.
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Speed Converter
Convert km/h, m/s, mph, and nautical knots.
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Map Scale Calculator
Calculate real-world distances based on map scales.
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Ohm's Law Calculator
Calculate voltage (V), current (I), resistance (R), and power (P).