Cost of Adding Another Child Calculator Excel — Shared vs New Costs, Sibling Discounts Included

Adding child #2 or #3 doesn't cost the same as your first child -- some costs are fully shared (housing, some toys), some are heavily discounted (sibling daycare rates), and some multiply completely (diapers, feeding). This calculator separates every cost category by its shared percentage, factors in sibling daycare discounts, and shows both the total additional monthly cost of the new child AND the new average cost per child across your whole family -- since per-child cost typically decreases with each additional child even as total household spending rises.

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