Why does a missed payment hurt so much in this simulator?

Payment history is FICO's most heavily weighted category (35%), and a missed payment is modeled as the most damaging single action here — consistent with FICO's own published guidance, though the real-world impact depends on your specific credit history.

Why does opening a new account hurt my score at all?

A new hard inquiry causes a small, typically temporary dip, and a new account also slightly lowers your average account age (length of credit history) — both are modeled here as small negative effects.

What's 'credit mix' and why does it help?

FICO's model rewards having a mix of credit types (e.g. both revolving cards and an installment loan), since it demonstrates you can manage different kinds of credit responsibly — it's a smaller factor (10% weight) than payment history or utilization.

Why is the score change capped between 300 and 850?

That's the actual range of the FICO score scale — the simulator clamps any calculated change so the illustrative result never falls outside the real-world possible range.

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Credit Score Simulator

Illustrative directional estimate of how common actions might move a FICO-style score.

🔒 Runs entirely in your browser — nothing here is ever uploaded

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Last reviewed 2026-08-30

About the Credit Score Simulator

Illustrates, directionally, how a handful of common actions (paying down utilization, an on-time payment streak, a missed payment, a new hard inquiry, adding a different credit type) tend to move a FICO-style score — using FICO's own published category weights, scaled to a simplified swing budget, since the actual proprietary algorithm can't be reproduced by any outside tool.

100% Free Runs in Your Browser No Sign-Up Required

How to use it

Enter your starting (illustrative) score.
Enter your credit utilization now and what you'd bring it to.
Enter a consecutive on-time payment streak length.
Toggle whether you've missed a payment, opened a new account, or added a different credit type.
Read the estimated score change and directional per-factor contribution.

Formula

Each action's effect = its FICO category weight (payment history 35%, amounts owed 30%, length of history 15%, new credit 10%, credit mix 10%) × a simplified swing budget (150 points) × a magnitude reflecting how large that specific action is (e.g. how much utilization changed, how long the on-time streak is). All effects are added directionally to the starting score, clamped to the 300-850 FICO range.

Worked example

A 650 starting score, reducing utilization from 60% to 20%, with a 12-month on-time payment streak and no other changes: an illustrative estimated increase to the high-600s or low-700s range, driven mostly by the utilization improvement (30% category weight) and the payment streak (35% category weight).

FICO score category weights (this simulator's basis)

FICO score category weights (this simulator's basis)
Category	Weight
Payment history	35%
Amounts owed (utilization)	30%
Length of credit history	15%
New credit	10%
Credit mix	10%

Interpreting your result

This is not a real FICO or VantageScore calculation — the actual proprietary algorithm evaluates your entire credit file together and cannot be reproduced by any outside tool, including this one. This simulator applies simple, capped directional adjustments based on FICO's own published category weights purely to illustrate which way, and roughly how much, common actions tend to move a score. The CFPB has noted that an educational score can differ meaningfully from the score a lender actually uses for roughly 1 in 4 consumers. Never use this to predict, guarantee, or substitute for your real credit score — check your card issuer's free score, myFICO, or an official credit bureau for that.

Recommendations

• Payment history (35%) and amounts owed/utilization (30%) are FICO's two most heavily weighted categories combined — prioritize on-time payments and lower utilization over other actions if you're trying to improve a real score.
• A missed payment is modeled as the single most damaging action here, consistent with FICO's own guidance that payment history is the largest category — the actual real-world hit depends on how late the payment was and your existing credit history.
• This tool is educational only — check your actual score via your card issuer, myFICO, or an official credit bureau rather than relying on any simulator's output.

Frequently asked questions

No — it's an illustrative, directional estimate only. FICO's actual algorithm is proprietary, evaluates your whole credit file together, and cannot be reproduced by any outside tool.