\input zb-basic \input zb-matheduc \iteman{ZMATH 2015d.00948} \itemau{Tay, Kim Gaik; Kek, Sie Long; Abdul-Kahar, Rosmila; Azlan, Mohd Azwir; Lee, Ming Foong} \itemti{A Richardson's extrapolation spreadsheet calculator for numerical differentiation.} \itemso{Spreadsheets Educ. 6, No. 2, 5 p., electronic only (2013).} \itemab Summary: Even though approximating the definite differentiation by Richardson's extrapolation method is straight forward, but its repetitive calculations are quite boring. Hence, there is a need to develop a suitable tool in teaching and learning for this method. Here, we developed a Richardson's extrapolation Excel spreadsheet calculator to approximate the numerical differentiation that can be used by students and educators who need its full solution. With an appropriate function entered by users using 3-point central formula and a starting step size $h$ full solution of Richardson's extrapolation table up to level 4 can be obtained quickly and easily. In this spreadsheet calculator, users can extend the level to any desired level by themselves. \itemrv{~} \itemcc{N40 N50 U70} \itemut{numerical analysis; numerical differentiation; Richardson's extrapolation; spreadsheets; approximation; derivatives} \itemli{http://epublications.bond.edu.au/ejsie/vol6/iss2/5/} \end