How Does the Worth It Score Work?
Every calculator on this site ends the same way: a single number from 0 to 100, and a verdict. This page is the plain-English walkthrough of where that number comes from — including a real worked example you can verify by hand. If you want the formal specification, the full methodology documents every design decision; this page is the version you'd explain to a friend.
The three verdicts
Worth It
The math clearly favors going ahead. You'll see a strong recommendation, and where relevant, where to act on it.
Consider It
Genuinely depends on your specifics. We show the pros, cons, and exactly which input would tip the verdict.
Not Worth It
The numbers don't support it. We say so plainly and point to the better alternative where one exists.
The bands are deliberately asymmetric. "Consider It" spans 40 points because most real financial decisions genuinely are situational — a calculator that calls everything either great or terrible is performing confidence, not analysis.
A worked example you can check
Take the Mortgage Payment Calculator, whose formula is published on its page: start at a base of 75; add 10 points for a down payment of 20% or more (5 for 10–19%, minus 10 below that); add 10 points for a rate at or below 5% (5 up to 6.5%, minus 5 up to 7.5%, minus 15 above); add 5 for a 15-year term.
Buyer A — 20% down, 6.4% rate, 30-year term:
75 + 10 (down payment) + 5 (rate) = 90 — Worth It. A strong equity position and a decent rate: the loan structure is sound.
Buyer B — 5% down, 7.9% rate, 30-year term:
75 − 10 (thin down payment) − 15 (expensive rate) = 50 — Consider It. Same house, same price — but this structure deserves hesitation: shop more lenders, or build the down payment first.
That's the whole trick: the score compresses the handful of numbers that actually drive the decision into one figure you can compare across scenarios. Run Buyer B with 10% down and a 6.9% rate and watch the score move — the point is to show you which lever matters most, not to hand down a ruling.
More examples across different decisions
The mortgage example above uses a simple additive formula. Here are two more from calculators with different structures, so you can see how the score adapts to different decision types.
This formula accounts for the price-to-rent ratio, your time horizon, and projected appreciation. A household in a city with a ratio of 28 planning to stay 4 years scores in the 30s — "Not Worth It" or low "Consider It" — because the break-even is likely beyond their horizon. The same household planning to stay 10 years scores in the 60s, because long tenure lets equity and appreciation offset the transaction costs. The score isn't saying buy or don't buy; it's showing you how sensitive the outcome is to one variable: time.
EV scoring weights the premium over a comparable gas vehicle against annual fuel and maintenance savings. A driver putting 15,000 miles/year on a car and charging at home (cheap) breaks even in under 5 years on most models — score 75+. A driver putting 7,000 miles/year and relying on public fast-charging (expensive) may never break even on the premium — score in the 30s. Same car, same sticker price, different usage pattern: the score shows you which driver the math is written for.
In each case, the single number is a starting point. The real value is in moving one slider at a time to find the input that most changes the result — that's the factor that deserves the most scrutiny before you decide.
How the score thresholds were calibrated
The 71/31 cutoffs weren't chosen arbitrarily. The "Worth It" threshold of 71 corresponds, roughly, to decisions where the financial case is strong enough that a reasonable person would proceed without needing a stronger nudge — net positive over a realistic time horizon, with a margin of safety against modest assumption errors. The "Not Worth It" cutoff of 30 marks cases where the math is negative even under generous assumptions.
The 40-point "Consider It" band between them is intentionally wide because most financial decisions genuinely sit there. Narrowing it — making 55 a hard "Worth It," for example — would create false precision. For decisions in the middle band, the calculator text explains exactly which input is closest to a tipping point, which is more useful than a bolder verdict number.
The v2 engine: where scoring is headed
Simple additive formulas like the one above are transparent and easy to verify, but they have hard edges — a rate of 7.5% scores very differently from 7.6%, which isn't how money works. Our newer calculators, starting with the Solar Panel ROI Calculator, run on an upgraded engine that fixes this in three steps.
First, it builds a full discounted cash flow projection — every dollar in and out over the life of the decision, with distant dollars counting less than near ones. Second, the result passes through a smooth logistic curve, so small input changes move the score a little instead of snapping it between bands. Third, it applies a prospect theory adjustment (Tversky & Kahneman, 1992): people feel losses roughly 2.25× as strongly as equivalent gains, so upfront costs are weighted the way you'll actually experience them, not the way a spreadsheet does. Existing calculators are migrating to v2 over time; each page's "How We Calculate Your Score" section always reflects the formula that page actually uses.
What the score deliberately doesn't measure
The framework behind the site — we call it the Worth It Triangle — holds that decisions come down to Money, Time, and Happiness. The score quantifies the first two. It cannot know your job security, your health, whether a baby is coming, or how much you'd simply love owning the thing. Where happiness factors are decisive — a gym membership you'd actually use, a commute that's destroying you — the calculator says so in its verdict text rather than pretending to score it.
A high score on a mortgage also isn't a statement that you can afford it — that's a separate question with its own tool: How Much House Can I Afford? scores your budget, while the mortgage calculator scores the loan.
Why the formulas are public
Every calculator page publishes its scoring inputs in a "How We Calculate Your Score" section, and lists its data sources — Federal Reserve (FRED), CFPB, Freddie Mac, EIA, and similar public benchmarks — at the bottom of the page. That's a deliberate design constraint: a score you can't audit is just a vibe with a number attached.
It's also why affiliate partnerships never touch the formula. Some calculators link to partners we may earn a commission from — those links appear after your score is computed, and they adapt to it: score low, and the recommendation softens to "not the right time yet" rather than pushing harder. The same inputs produce the same score whether or not an affiliate exists for that page. If the day comes when that stops being true, this site stops being useful, and we know it.
Frequently asked questions
Do affiliate partnerships influence the Worth It Score?
No. The score is computed entirely from the numbers you enter, using the formula published on each calculator page. The same inputs always produce the same score regardless of whether an affiliate partner exists for that category. Affiliate recommendations appear after the score is calculated and adapt to it — a low score triggers a softer suggestion, not a pushier one. The formula runs first; the recommendation responds to the output.
Can the Worth It Score be wrong?
The score can only evaluate what you tell it, using the assumptions baked into the formula. It measures the financial structure of a decision — costs, savings, break-even timing, projected return — not your job security, health, family plans, or how much you'd simply enjoy the thing. Treat it as a well-built starting point for a decision, not the decision itself. If you enter accurate numbers and the score comes back 45, that's genuinely useful information: it means the financial case is real but not overwhelming, and you should look harder at which assumptions could break your way or against you.
Why does the score sometimes surprise me given what I expected?
Usually because one input carries more weight than people expect — often the time horizon. Most financial decisions look very different at 3 years versus 10 years. The prospect theory adjustment in v2 calculators also tends to push scores lower than a simple ROI percentage would suggest, because it weights upfront costs the way humans actually experience them rather than how a spreadsheet treats them. If your score is lower than your intuition said it would be, the most productive move is to change one input at a time until you find which variable is doing the most work.
See the score in action — run your own numbers through any of our calculators.
Browse All Calculators →Related
By Sean Baldwin · Last reviewed July 2026 · Companion to the full methodology.