What Is a Capital Ratio? The Most Important Bank Safety Metric Explained
The capital ratio is the single best indicator of a bank's financial resilience. Here's what it means, how regulators use it, and why depositors should care.
Walk into any bank regulator's office and ask them which metric they watch most closely. The answer — almost universally — is the capital ratio.
What is a capital ratio?
A bank's capital ratio is the percentage of its total assets funded by equity — money belonging to the bank's owners — rather than borrowed money (deposits and other debt). The formula:
Capital Ratio = Equity Capital ÷ Total Assets
If a bank has $100 million in assets and $10 million in equity, its capital ratio is 10%. The remaining 90% is funded by depositors' money and other borrowings.
Why does it matter?
Capital is a bank's loss-absorbing buffer. When loans go bad or asset values fall, losses come out of equity first. A bank with a 10% capital ratio can absorb losses equal to 10% of its total assets before deposits are at risk. A bank with a 4% ratio has far less cushion.
FDIC's capital thresholds
- Well-capitalized: Total risk-based capital ratio ≥ 10%
- Adequately capitalized: 8%–10%
- Undercapitalized: Below 8% — triggers regulatory scrutiny
- Critically undercapitalized: Below 2% — at serious risk of failure
Data sources: FDIC BankFind Suite (quarterly call reports), NCUA Financial Performance Reports, CFPB Consumer Complaint Database. Financial figures reflect the most recently published quarterly call report data. Complaint data is updated as new CFPB records are published. The Bankzia Trust Grade is a proprietary composite score — not a government rating. Deposits at all listed institutions are federally insured up to $250,000 per depositor, per ownership category.
Frequently Asked Questions
Betty Jones has spent 12 years covering banking regulation, consumer finance, and the economics of trust in financial institutions. She started her career at a regional newspaper covering the Federal Reserve and FDIC regulatory beat before moving into financial media. Betty holds a journalism degree from the University of Texas at Austin and has been a contributing analyst at several fintech publications. She built Bankzia's editorial framework and is the primary author of the Trust Grade methodology explainer series.
