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Find the best time to wake up based on your bedtime and natural 90-minute sleep cycles.

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Calculate how much your appliances cost to run per day, month, and year.

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Free calculator with full expression support — parentheses, exponents, and more.

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Calculate days, weeks, months, and years between any two dates.

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Convert between 40+ world currencies with reference exchange rates.

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Calculate tip amounts and split bills easily among friends.

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Calculate your Grade Point Average on the standard 4.0 scale.

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Calculate monthly payments, total interest, and total cost for any loan.

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Find out how much water you should drink every day based on your body and lifestyle.