Estimating total carbon content in soil is of importance since organic soil carbon affects many important chemical, physical and microbiological properties. Calcareous soils present a special problem since the inorganic carbon fraction often needs to be determined to estimate organic from total carbon. All carbonates in soil dissolve completely in strong mineral acids. Our objective was to develop a gravimetric technique to quantify inorganic carbon as carbon dioxide, using the carbonate-meter. The carbonate-meter can be prepared in any soil testing laboratory with the following components: One 50-ml Erlenmeyer flask, one 4-ml glass vial, and one number-1 rubber stopper with one hole. The inorganic carbon as carbon dioxide from two calcareous check soils were analyzed gravimetrically using the carbonate-meter, using 0.500 + 0.005 g. of fine soil and 4 ml of 4 M HCl solution. Results, after 5 hrs from initial reaction showed 97.53 % and 93.13 % recovery, for the two check soils containing 0.728 % and 2.57 % inorganic carbon, respectively. The procedure is simple and low cost, and has good accuracy and precision.