sasori Posted February 27, 2013 Share Posted February 27, 2013 hi, how to convert this excel spreadsheet into PHP ? B3 = principal = 1,934 B4 = interest flat rate = 15% fixed B5 = tenor in months = 60 fixed B10 = monthly = $46.01 the formula for cell B10 is PMT(B4/12,B5,B3) so how did the B10 became 46.01 Quote Link to comment Share on other sites More sharing options...
Solution kicken Posted February 27, 2013 Solution Share Posted February 27, 2013 Some google searching lead to http://www.tvmcalcs.com/tvm/formulas/regular_annuity_formulas that describes the actual math formulas behind the function. The one you're interested in is probably the third one: Periodic Payment when PV is known Quote Link to comment Share on other sites More sharing options...
AndyGee Posted June 3, 2013 Share Posted June 3, 2013 (edited) Something like this? function pmt($apr, $loanlength, $loanamount){ $apr /= 1200; return ($apr * -$loanamount * pow((1 + $apr), $loanlength) / (1 - pow((1 + $apr), $loanlength))); } for 18%APR over 8 months on a principal of 1099 pmt(18, 8, 1099); =146.80884303075 Edited June 3, 2013 by AndyGee Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.