Realistic estimates of chemical aggregate exposure are needed to ensure consumer safety and satisfy the requirements of regulators. In most cases, aggregate exposure is estimated simply by adding deterministic exposures from all product types containing the chemical. However, this summation will result in an unrealistically-conservative estimate since individuals vary in their patterns of product use, and it is very unlikely that consumers use high levels of all products at the same time. As aggregate exposure estimates could be used to calculate acceptable “safe levels” and conduct risk assessments for chemicals, methods are needed to produce realistic exposure estimations.