FHA vs. Conventional Affordability: Which Calculator Tells the Truth?

The headline question

"Should I take an FHA loan or a conventional loan?" is a question with at least four right answers depending on credit score, down payment, planned holding period, and local market. Most consumer calculators that purport to answer it pick a single dimension and optimize against it.

We tested five tools — Bankrate, NerdWallet, FHA Mortgage Center, Quicken/Rocket's comparison flow, and Zillow — on the same buyer profile.

The buyer

First-time buyer, 692 credit score, 5% down on a $385,000 home in a county with the FHA limit at $498,257. Annual income $96,000, $410/mo non-housing debt. Not planning to move within five years; expects to refinance opportunistically if rates fall.

What each tool recommended

Bankrate showed both options side-by-side without picking one. It correctly displayed FHA's 1.75% upfront MIP (financed) and 0.55% annual MIP that doesn't cancel under post-2013 rules. It also showed the conventional option with 0.95% PMI that cancels at 78% LTV.

NerdWallet showed the same comparison but added a "Recommended" tag on the conventional option, citing the lifetime MIP issue.

FHA Mortgage Center (a marketing site for FHA originators) recommended FHA without surfacing the lifetime MIP cost.

Quicken/Rocket's flow kicked the borrower toward conventional with a brief mention that FHA might be available — but didn't actually run the FHA scenario.

Zillow showed both monthly payment figures without surfacing the lifetime cost difference.

The math, properly run

For our test borrower at 5% down on a $385,000 home, FHA at 6.50% with 1.75% upfront MIP financed (loan amount becomes $372,150) and 0.55% annual MIP produces a starting monthly payment of approximately $2,687 (P&I + MIP, excluding tax/insurance).

Conventional at 6.875% with 0.95% PMI on a $365,750 loan produces a starting monthly payment of approximately $2,693.

Within $6/month of each other at month one. The divergence comes later.

At month 60, the conventional borrower has paid down enough principal to drop PMI (assuming home value holds at $385,000). Monthly payment falls to approximately $2,402.

At month 60, the FHA borrower's MIP is unchanged. Monthly payment is still approximately $2,687.

Over years 6–30 (assuming the loan is held to maturity, which most aren't), the FHA borrower pays an additional $171 × 300 months ≈ $51,000 more than the conventional borrower. The gap widens further when accounting for the financed upfront MIP that's been accruing interest.

When FHA is correct

Borrowers below 680 credit score: conventional pricing gets punitive fast. FHA's pricing matrix is much flatter at lower scores, and the 3.5% down requirement is structurally part of the program.

Borrowers planning to refinance within 3–5 years: the FHA streamline refinance is fast, doesn't require a fresh appraisal, and lets borrowers re-enter conventional once their credit profile improves. The lifetime MIP problem becomes a 3-year MIP problem.

Borrowers in markets where FHA loan limits are high enough to matter: high-cost counties have FHA limits up to $1.149M in 2025, which makes FHA viable for substantial loans rather than only entry-level.

When conventional is correct

Borrowers at or above 740 credit score with 5%+ down: conventional pricing rewards good credit aggressively, and the PMI cancellation path is structurally clean.

Borrowers with 20% down: no PMI, no MIP, the FHA option is simply more expensive in every dimension.

Borrowers planning to hold the loan long-term: the lifetime MIP gap on FHA compounds, and the conventional borrower's eventual PMI drop creates real monthly savings the FHA borrower never gets.

What the calculators consistently miss

The refinance pathway is invisible in every consumer FHA-vs-conventional calculator we tested. A first-time buyer who takes an FHA loan today knowing they'll refinance into a conventional in three years has a fundamentally different cost profile than one assuming they'll hold FHA to maturity. None of the calculators model this — but for many real-world borrowers, it's the dominant scenario.

Loan-level price adjustments at lower credit scores also aren't fully modeled. A 680-score borrower might see conventional pricing 50–100 bps higher than FHA on the same date — a meaningful number that some calculators average out rather than show explicitly.

The verdict

Use Bankrate or NerdWallet for the comparison. Ignore tools that recommend a loan without showing the lifetime cost. Run both scenarios through your specific credit and rate quotes — generic averages will not capture the LLPA spread that actually drives the choice for borderline-credit borrowers.

The right answer depends on you, your timeline, and what your lender will actually price. A calculator's job is to make the trade-off visible. Most do half the job. A few do nearly all of it.