The aim of the study was to prepare a tool for quantitive evaluation of calcium intake and its calibration. The ADOS-Ca test calibration was carried out by the 24-hour recall method repeated seven times. The study included 90 people (aged 22.6±0.1) who gave complete information, i.e. 630 nutrition interviews and 90 ADOS-Ca tests. Calcium intake from dairy products estimated by the test was stated in mg/person/day and was estimated on the basis of the consumed products amount, intake frequency indices and calcium content in 100 g of a product. Calibration included comparing the mean calcium intake (dependant-sample t-test, correlation coefficient) and compatibility of population distribution (chi2 test) in calcium intake classes (<66.7% of the Polish RDI at the safe level = calcium deficiency risk; 66.6-90% of RDI = no calcium deficiency risk; >90% of RDI = no calcium deficiency risk). Moreover sensitivity, specificity and accuracy indices were calculated for the prepared test. No differences between mean calcium intake from dairy products estimated by the ADOS-Ca test and the 24-hour recall method repeated seven times (men: 619 mg vs. 661 mg; p=0.263; women: 434 mg vs. 442 mg; p=0.645) were revealed, but calcium intake correlation was noted. No differentiation in the population distribution in three calcium intake classes was noted, and the percentage of people classified accurately into the same class by the ADOS-Ca test and the 24-hour recall method repeated seven times was high (71% of the population). The noted high sensitivity index value (88%), shows high ability of the test to classify people properly to a group under calcium deficiency risk. The prepared ADOS-Ca diagnostic test was proved to be a good tool for quantitive evaluation of calcium intake from dairy products and enabled accurate classification of people with different calcium intake with regards to risk of its deficiencies.