There are various child support calculators available online that estimate the amount of child support based on different jurisdictions' guidelines and formulas. Here are some key types of child support calculators found:

• In Norway, the Nav child support calculator suggests amounts based on parents' financial circumstances and child's age, meant for private agreements without involving the government.

• New Zealand offers a calculator estimating payments based on parents' income, children’s living arrangements, and other dependent children. It is a guide but not a legal decision.

• Germany uses the Düsseldorf Table for calculations, considering child's age, living situation, and income of parents. It can include deductions for children’s income and special costs.

• California's Child Support Guideline Calculator estimates support amounts under their legal guidelines, including arrears payoff.

• The UK Government provides a calculator to work out child maintenance based on official rules.

• Other jurisdictions like Maryland use income-sharing models factoring in health insurance and extraordinary expenses.

Child support calculators generally require input of parental income, details and number of children, living arrangements, and sometimes other child-related expenses to estimate a fair support amount. If you have a specific jurisdiction or case in mind, that can help tailor the best calculator or method to recommend.