Kids’ birthday gift calculator

Methodology

This tool runs the Kindhow Scale, version 1.0: a baseline drawn from a named publication, plus a stack of adjustments you select. Each adjustment is tagged sourced when a publication backs that exact figure, and house judgment when the reasoning is ours. There is no third tag, and no line on this site is unlabelled.

The formula

published       what Reviewed actually printed, in 2023 dollars
  + CPI carry     forward to July 2026 on CPI-U CUUR0000SA0
  ± party size    Emily Post's guide (age + 1) ÷ the actual guest count
  + your kids     one bigger gift, never two of them   (ours)
  − no gifts      the whole amount, when the invitation said so
  ─────────────
  = subtotal
  ÷ group size     if several parents are going in together
  ≈ rounded        to $5 / $10 / $25 steps, by size (lib/giveable.js)
  + $0 CFR line    what the age on the box legally means

The figures — and the year they were printed in

One outlet publishes real dollar figures for a children’s birthday gift: Reviewed, USA TODAY’s product desk. A classmate or a friend is $20–$30 with $25 the sweet spot; you can spend up to $100 on the child of a close friend or relative; budget at least $100 for your own children. Those are the numbers every other page in this category repeats.

They were printed in February 2023, and nobody says so. That is the single biggest error on this subject online, and it is not a matter of opinion: CPI-U (series CUUR0000SA0) averaged 304.7 across 2023 and stood at 333.9 in July 2026, a factor of 1.10. So the $25 sweet spot is $27 now, and the $100 ceiling is $110. Line 0 of every result is the published figure in 2023 dollars, and line 1 is that carry — two sourced lines, two different publications, and the second one is why this tool disagrees with the rest of the internet.

Four shapes of published figure

A range, a ceiling and a floor are three different claims, and a calculator that renders all of them as tidy bands is inventing the parts that were never published. Our graduation calculator met the first three shapes; this one adds the fourth. “Up to $100” is a ceiling with no floor, so a close-friend baseline is tagged sourced at exactly $100 and house judgment at every dollar below it — the mirror image of the high-school floor on that page. Where you sit inside a shape is always ours.

The party-size line — a published rule doing arithmetic

The Emily Post Institute publishes a guest-list guide for a child’s birthday: “one guest for each year of your child’s age, plus one.” So a six-year-old’s party is meant to be about 7 children, and the whole-class party you were actually invited to is twenty-four. That gap is real information about what is expected of you, and every other calculator throws it away.

We divide the recommended size by the actual size and clamp the result between 0.75 and 1.10, so a party three times the guide takes 25% off and a genuinely small one adds 10%. The guest rule is Emily Post’s; the clamp and the percentages are ours, and the ledger line says so. Leave the guest count blank and the line does not appear at all — we would rather show nothing than guess at the input.

Adjustments — house judgment

The three lines that are not adjustments

“No gifts, please.” Tick that and the gift line goes to $0 and stays on the ledger with its reasoning attached. It is tagged house judgment, not sourced: Emily Post’s page on children’s parties covers the guest list and the thank-you note and does not address what a guest should do with that instruction, and we are not going to dress our reading of it up as theirs.

You can’t make it. Same treatment, same tag. A gift is for attending. Send the RSVP promptly — that is the part that actually matters to whoever is counting chairs — and a card if you are close to them.

What the age on the box is. Under 16 CFR Part 1501 a toy intended for a child under 3 may not contain a small part at all, and under 16 CFR § 1500.19 a toy that does must carry the choking-hazard warning. Two of those labels run further than people expect: a latex balloon names children under 8, and a toy containing a small ball or a marble warns about “larger children who put objects in their mouths” up to 8 as well. So a toy for a child under 8 gets that line at $0. It changes what may legally be in the box, not what you spend on it.

What this tool will not do

• It will not treat “$1 per year of age” as a rule. We looked for an etiquette authority behind it and did not find one. It is computed and shown next to the answer, tagged as unpublished, because a ledger line here has to be sourced or ours and that is neither. The per-year-of-age rule that is published for a child’s birthday counts guests.
• It has no opinion about your budget. There is no line telling you to be more generous and no comparison to what other parents spent. If money is tight, spend less; the arithmetic is not a verdict.
• It is not a safety assessment. The choking-hazard line describes federal labelling rules. Whether a particular toy is right for a particular child is a judgment only the people who know that child can make.
• One publication is thin, and we would rather say so. Reviewed’s figures are the only real ones published on this subject, they are from 2023, and the survey behind the “average parent spends $400 on the party” line is not identified in the article — so we do not use that figure anywhere in the arithmetic. If a better source appears, the scale version moves.
• It is US-only. A standing agreement between families, a class that has already settled on a $10 cap, or a child who has asked for one specific thing all beat anything a model can compute. For a pooled class gift, our group gift share calculator splits it by how close each family actually is.

Sources

• Reviewed (USA TODAY) — Are you spending too much money on kids’ birthday gifts? — $20–$30 for a classmate or friend with $25 the sweet spot, up to $100 for the child of a close friend or relative, at least $100 for your own children. By Brigitt Earley; updated February 2023.
• The Emily Post Institute — Kids’ Birthday Parties — the guest-list guide of one guest per year of the child’s age plus one, and the instruction not to hand invitations out at school unless everyone gets one.
• U.S. Bureau of Labor Statistics — Consumer Price Index for All Urban Consumers (CPI-U), U.S. city average, all items — series CUUR0000SA0, annual average 304.702 for 2023 against 333.918 for July 2026. The same index and the same code our gift reciprocity calculator runs on.
• 16 CFR Part 1501 and § 1500.19 — CPSC small-parts ban and choking-hazard labelling — the required choking-hazard label texts and their age thresholds, and the small-parts ban on toys intended for children under 3.

Informational only, not professional advice. The Kindhow Scale is a published model, not a standard, and the lines marked house judgment are our reasoning and nothing more. The choking-hazard line describes federal labelling rules, not a safety assessment of any particular toy. Last reviewed: August 2026. Scale version 1.0. Figures that come from a publication are re-checked against their source on a monthly cycle; the price index carries a monthly cadence of its own, and when either moves, the version number moves with it.