Hawaii Child Support Calculator

How is Child Support Calculated in Hawaii?

Hawaii calculates child support to cover your child's needs while ensuring each parent can first meet their own basic living expenses. Governed by Hawaii Revised Statutes § 576D-7, this Melson Formula first sets aside a reserve for each of you, covers the child's primary needs, then divides any remaining income to allow your child to share in your standard of living.

Understanding Hawaii's Melson Formula

In Hawaii, shared physical custody significantly impacts the child support calculation when each parent has the child for at least 143 overnights per year. Once this threshold for 'Extensive Time-Sharing' is met, a different formula is used that adjusts the support amount to reflect the increased costs of maintaining two separate households for the child, as outlined in the Hawaii Child Support Guidelines.

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✓ Verified for 2026 Guidelines • Reviewed October 2026 by Harmoney

Hawaii Child Support Guidelines at a Glance

Guideline Model Melson Formula
Governing Legal Authority Hawaii Revised Statutes § 576D-7
Shared Custody Threshold 143 Overnights (Extensive Time-Sharing)
Age Support Ends Age 18 (or 23 if enrolled in post-secondary education)
Modification Standard 10% Change in Support Amount (Presumed Material Change)

Frequently Asked Questions About HI Support


At what age does child support end in Hawaii?

Child support in Hawaii ends at age 18, but it can be extended by the court until age 23 if the child is enrolled as a full-time student in post-secondary education. This unique provision for college support is authorized under Hawaii Revised Statutes § 580-47(a).

How is child support calculated if one parent is unemployed in Hawaii?

If a parent is voluntarily unemployed or underemployed, a Hawaii court will 'impute' or assign an income to them based on their potential earning capacity. The Hawaii Child Support Guidelines base this imputed income on factors like the parent's work history, qualifications, and prevailing job opportunities.

How do I modify a child support order in Hawaii?

You can modify a child support order in Hawaii by proving a material change in circumstances has occurred since the last order was issued. Under the Hawaii Child Support Guidelines, a new calculation that results in a 10% or greater change in the support amount is presumed to be a material change warranting modification.

Does Hawaii child support cover college expenses?

Yes, Hawaii courts have the authority to order a parent to provide support for a child's post-secondary (college) education until the child reaches age 23. Governed by Hawaii Revised Statutes § 580-47(a), this is not optional and can be ordered by the court based on the parents' financial ability and other factors.

How does Hawaii handle health insurance and childcare costs?

Health insurance premiums and reasonable work-related childcare costs are added to the basic child support obligation and are divided between the parents in proportion to their respective incomes. The Hawaii Child Support Guidelines treat these as mandatory 'add-on' expenses to ensure a child's needs are met.