With the mortgage in A1, Annual Interest Rate as a % in B1, Monthly Instalment in C1, the formula for calculating the number of months to pay off the mortgage is:
=NPER(B1/12,-C1,A1,0,0)
For your data, the result is 463.14 months.
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Cheers,
Paul Edstein
[Fmr MS MVP - Word]
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