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@CFAcharterwannabe‌ beautifully put.
@ensenmason‌ The calculator calculates it as an investment, i.e. you’re telling it you’ve PAID IN $1000 at the start, so at the end you should be PAID OUT $1,610. So the signs are opposite to each other (i.e. you enter in -1000, FV comes out as +1610).
Since you’re simply calculating the future value of a payment, the signs are the same.
So I’d use conceptual knowledge to double-check on what the signs should be. Just treat it as cashflow as @CFAcharterwannabe‌ and you’ll be alright 🙂