How Is a FICO Score Actually Calculated? The Published Recipe, Slice by Slice
Your credit score is not a number somebody picks for you. It is set by a formula — five ingredients with exact, published percentages — and two of them do almost two-thirds of the work.
What are the five slices, exactly?
These are FICO's own published general weights, from its own education page. Your exact mix shifts a little with your file, but the shape never changes. In the video's bands: below 580 is rough territory, 670 to 739 is good, 740 and above usually gets the best prices a lender offers. The ingredients are cooked from your credit reports, and you have three — Equifax, Experian, and TransUnion. A bureau is a company that keeps a file of your borrowing history; each file is fed by your banks and card companies, so scores can differ bureau to bureau. Pull all three free, every week, at AnnualCreditReport.com.
What does the 35% slice — payment history — actually ask?
One question, about every account: did you pay on time? How late matters. Thirty days late is a bruise. Sixty is worse. Ninety is a broken bone. In FICO's own published examples, one 30-day late payment can cost a strong score around 100 points — the higher you start, the farther you can fall. The mercy: old lates fade; one from last month shouts, one from five years ago barely whispers. Rule one: never let a payment cross 30 days late. Autopay for at least the minimum is the cheapest insurance your score can buy.
Why can a bigger balance score better than a smaller one?
Amounts owed is 30%, and here is the twist: the slice does not measure your balance. It measures how much of your limit you are using — that share is called utilization. Card one in the video: a $900 balance with the limit only $100 higher — 90% used, the danger zone. Card two: a bigger balance, $9,000, on $100,000 of total limits — 9% used. Bigger debt, better score. It is the bucket rule: it does not matter how much water is in your bucket. It matters how full the bucket is.
Same bucket, second way in. A bucket filled to the brim spills if anything moves; one filled a quarter of the way has room for a bad week. Keep it low — under 30% used is the ceiling you will hear quoted, and lower is better. And know the date that runs it: your card company reports the balance on your statement closing date, a snapshot. Pay down before that date and the snapshot shows the smaller balance. The due date protects you from interest. The statement date talks to your score.
Watch: every slice, walked through in order
Video summary: The video lays out FICO's five published categories with their exact weights, adding up to 100% — no income, no job title, no zip code. It works through each slice: payment history, and why a 30-day late hurts a strong score most; amounts owed and the bucket rule, with the $900-at-90% card scoring worse than the $9,000-at-9% card; the statement closing date as the moment your balance gets photographed; length of history and the oldest card you should almost never close; new credit, hard inquiries, and why rate shopping inside a two-week window counts as one search; and credit mix as seasoning, not the meal.
What do the last three slices reward — and punish?
Length of history, 15%: the formula reads your oldest account, your newest, and the average age of everything in between — why your oldest card is seniority, not clutter. New credit, 10%: every application leaves a footprint called a hard inquiry; one costs a few points and stops counting after about a year. Checking your own credit is a soft inquiry and never hurts you. Open five cards in a month, though, and the formula smells desperation — and new accounts drag down your average age, so one spree bruises two slices. Rate shopping is different: applications for one mortgage or one car loan inside a two-week window count as a single search. Credit mix, 10%: proof you can handle more than one kind of credit — revolving credit, like cards you can reuse, and installment credit, like loans paid down on a schedule. Never take on debt you do not need just to season the recipe. Ten percent is seasoning, not the meal.
Questions people ask about the recipe
Which two FICO slices matter most?
Payment history at 35% and amounts owed at 30% — together, 65% of your score. Payment history asks: did you pay on time, and how late were you when you did not? Amounts owed measures how much of your limit you are using, not your balance. Guard those two first: autopay at least the minimum, and keep balances low before your statement closing date.
Why is the score in my free app different from my lender's score?
Because they may not be the same score. Many free apps show a VantageScore, while most lenders still grade you with a FICO score. Both read the same credit reports but weigh the file differently, so the two numbers can disagree by dozens of points. Neither is fake. Know which score your lender reads before you celebrate a good number — or panic over a bad one.
Turn the recipe into your plan — free
Run the free Credit Goal Planner on our homepage: tell it where your score is and where you want it, and it maps the milestones in order. Pair it with the free Score Damage Analyzer: fixmycredit.site/#free-tools.