Financial Aid Gap Calculator
Subtract grants, loans, work-study, and your SAI (formerly EFC) from cost of attendance to see unmet need and the gap your family must fund.
Unmet need vs. the gap to fund
Two different numbers, both called a "gap" in colloquial use, both legitimate — but with different meanings depending on who is talking. The financial-aid office measures unmet need: COA minus the full aid package (grants, work-study, federal loans) minus the family's SAI. If unmet need is zero, the school "met full need" in their accounting. Families measure something different — the gap to fund: COA minus grants, work-study, and federal loans, with no SAI subtracted. That is the literal dollar amount the family writes checks for (or borrows privately). The calculator shows both, because both are real.
A worked example makes it concrete. COA $60,000. SAI $15,000. Grants $8,000, work-study $2,500, federal loans $5,500. Unmet need = 60,000 − 8,000 − 2,500 − 5,500 − 15,000 = $29,000. Gap to fund = 60,000 − 8,000 − 2,500 − 5,500 = $44,000. The school's financial-aid letter reports $29,000 of unmet need; the family writes $44,000 in checks (or signs Parent PLUS loans, or taps savings). The $15,000 difference is the SAI — the amount the federal formula assumes the family will contribute.
The 2024–25 FAFSA Simplification Act
The FAFSA Simplification Act, effective with the 2024–25 award year, replaced the Expected Family Contribution (EFC) with the Student Aid Index (SAI). The change is not cosmetic. The SAI formula dropped the sibling discount (previously, having two children in college halved each family's EFC; under SAI, that reduction is gone), can produce negative values down to −$1,500 (signaling deep need and potentially unlocking more grant dollars), and removed the small-business / family-farm exclusion in some cases. For many middle-income families with multiple college-age children, the SAI is meaningfully higher than the old EFC would have been — a rough estimate is 40–60% higher for two-in-college families.
If you are looking at a financial-aid letter from 2023–24 or earlier, the number is an EFC; from 2024–25 or later, it is an SAI. The calculator accepts either — enter whatever number your award letter shows.
What counts as cost of attendance
COA includes both direct costs (tuition, mandatory fees, on-campus room and board) and indirect estimates (books, supplies, transportation, personal expenses, and health insurance if the school requires enrollment in its plan). The direct costs are what the school bills; the indirect costs are your out-of-pocket estimates for the year. Combined, they form the federal cap on total aid — no combination of grants, scholarships, loans, and work-study can exceed COA.
One trap: schools often publish a "tuition and fees" number that is lower than COA. That is not the cost of attendance — it is the billable tuition only. To compare schools apples-to-apples, always use full COA, which every school publishes on its financial-aid page in a standardized format.
Should loans count as "aid"?
Financial-aid offices count federal Direct Loans (subsidized and unsubsidized) as part of your aid package because they reduce unmet need on their spreadsheet. From a family-budgeting perspective, loans are deferred cost — you pay them back with interest. If you want a true out-of-pocket view, re-run the calculator with $0 in the loan field and you will see the gap-to-fund excluding loans. That is the "cash you or your future self will pay" number. Many families find that more useful than the official unmet-need figure.
Federal Direct Loan limits for dependent undergraduates in 2024–25: $5,500 freshman year ($3,500 subsidized max), $6,500 sophomore, $7,500 junior and senior, with a $31,000 aggregate cap. Subsidized loans do not accrue interest while you are enrolled at least half-time. Unsubsidized loans accrue interest immediately; you can defer payment but the interest capitalizes.
Closing the gap
Common levers families use, in rough order of attractiveness: appeal the financial-aid decision (especially if you have a competing offer with more grant aid — many schools will reconsider), apply for outside scholarships (local foundations, community groups, employer programs, religious organizations), work out a tuition payment plan with the bursar (most schools offer 10-month no-interest plans), draw down 529 balances, take a Parent PLUS loan (fixed rate, federal, but high interest and no income-based repayment for parents), take a private student loan (variable rate, credit-based), or choose a less expensive school. The last option sounds glib, but the gap-to-fund number makes the calculus obvious: if the gap exceeds what the family can sustain for four years without compromising retirement or taking on ruinous debt, a different school is frequently the right answer.
Things this calculator will not do
It does not compute your SAI — use the Federal Student Aid Estimator at StudentAid.gov or the school's own Net Price Calculator for that. It does not factor in outside scholarships (enter them in the grants field yourself). It does not project tuition inflation across four years (COA typically rises 3–5% per year; plan for it). And it does not evaluate whether a school is worth its net price — that is a judgment call involving career outcomes, major fit, and family values, not arithmetic.