ready reckoner 
noun
A book or table listing standard numerical calculations or other kinds of information presented formulaically.At the heart of the analysis is the ‘balance scorecard’, a spreadsheet-based ready reckoner of tax reforms and other fiscal tweaks that is used to balance the Treasury's books....
- The ready reckoner also imparts information on basic car care, safe repairing and various types of accessories.
- The directory, which is priced at Rs.50, is a ready reckoner on listings related to wedding trousseau, wedding accessories, flower decoration and back-drops, accommodation for the guests and much more.