Calvert Investments offers various funds, each with its own minimum investment requirements that can vary. Generally, for mutual funds, the minimum initial investment is often around one thousand to three thousand dollars. However, some specific funds may have different thresholds, especially those aimed at retirement accounts or certain classes of shares. Additionally, subsequent investments can sometimes be lower, often around one hundred dollars. It is essential for investors to review the specific fund details to confirm the exact amount needed for initial and subsequent investments. The information can usually be found in the fund prospectus or on the Calvert Investments website. It is advisable for potential investors to carefully consider the fund that aligns with their financial goals and investment strategy. Checking the current web page for the latest information on minimum investments will provide the most accurate details.