The Solow Growth Model is described in detail at a level suitable for undergraduates in Charles I. Jones, Economic Growth, Second Edition, W.W. Norton and Company, 2002.
Production is given by the production function Y = Ka(AL)1-a, where Y is output, K is capital, L is labor, and A is a labor-augmenting technology factor. The capital stock increases in a given period by the amount sY - dK, where s is the savings rate and d is the depreciation rate. The labor force grows at rate n, and the technology factor A grows at rate g.
The Model Link below is an Excel spreadsheet that you can download (right click and select "save target as"). The spreadsheet implements a difference equation version of the differential equation form of the Solow Growth Model.
Overview of Macro Models
Overview of Micro Models