Reserve Ratio — Smart Financial Analysis
Calculate reserve ratios, money multiplier, and maximum money creation. Understand fractional reserve banking and Fed reserve requirements.
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The percentage of deposits that banks must hold as reserves (cash in vault or at the Fed). In March 2020, the Fed eliminated reserve requirements to support lending during COVID. Reserves held above the required minimum. Lower ratio → more lending → more money creation.
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Why: The percentage of deposits that banks must hold as reserves (cash in vault or at the Fed). Prior to March 2020, US banks had a 10% requirement. The Fed reduced it to 0% during C...
How: Enter Total Deposits ($), Reserve Ratio (%), Excess Reserves ($) to get instant results. Try the preset examples to see how different scenarios affect the outcome, then adjust to match your situation.
Run the calculator when you are ready.
📋 Quick Examples — Click to Load
📊 Reserves Breakdown
Required vs excess reserves vs loanable funds
🍩 Deposit Allocation
Required vs excess vs loans
📊 Money Multiplier by Ratio
Multiplier at different reserve ratios
📈 Money Creation Through Lending
Total money created through lending rounds
Reserve Ratio
Money multiplier: 10.00x. Max money creation: $50.0M.
For educational purposes only — not financial advice. Consult a qualified advisor before making decisions.
💡 Money Facts
Reserve Ratio analysis is used by millions of people worldwide to make better financial decisions.
— Industry Data
Financial literacy can increase household wealth by up to 25% over a lifetime.
— NBER Research
The average American makes 35,000 financial decisions per year—many can be optimized with calculators.
— Cornell University
Globally, only 33% of adults are financially literate, making tools like this essential.
— S&P Global
The reserve ratio is one of the most powerful tools in central banking, directly controlling how much money banks can create through lending. In a historic move, the Federal Reserve reduced the US reserve requirement to 0% in March 2020 - the first time since the Fed's founding in 1913. Understanding fractional reserve banking and the money multiplier is fundamental to grasping how modern monetary systems work.
Sources: Federal Reserve Board, FDIC, Bank for International Settlements, Federal Reserve Bank of St. Louis (FRED).
Key Takeaways
- • Reserve Ratio = Required Reserves / Total Deposits × 100
- • Money Multiplier = 1 / Reserve Ratio (e.g., 10% = 10x)
- • Maximum Money Creation = Excess Reserves × Money Multiplier
- • US reserve requirement dropped to 0% in March 2020
Did You Know?
How Does the Reserve Ratio Work?
Reserve Calculation
Reserve Ratio = Required Reserves ÷ Total Deposits × 100. With $100M deposits and 10% reserves, required reserves = $10M.
Money Multiplier
Money Multiplier = 1 ÷ Reserve Ratio. At 10%, each $1 deposited can create up to $10 through lending. At 0%, the theoretical multiplier is infinite.
Money Creation
Maximum Money Creation = Excess Reserves × Money Multiplier. Banks lend excess reserves; each loan creates new deposits in the system.
Expert Tips
Reserve Ratio Comparison
| Country/Region | Reserve Ratio | Money Multiplier |
|---|---|---|
| United States | 0% | ∞ (capital-limited) |
| Eurozone (ECB) | 1% | 100x |
| China | 15–20% | 5–6.7x |
| US (historical) | 10% | 10x |
Frequently Asked Questions
What is the reserve ratio?
The percentage of deposits that banks must hold as reserves (cash in vault or at the Fed). Prior to March 2020, US banks had a 10% requirement. The Fed reduced it to 0% during COVID.
What is the money multiplier?
1 / Reserve Ratio. With 10% reserves, each $1 deposited can create up to $10 in the banking system through lending. At 0% reserves, the theoretical multiplier is infinite (limited by bank capital).
Why did the Fed set reserves to 0%?
In March 2020, the Fed eliminated reserve requirements to support lending during COVID. Banks now rely on capital requirements and liquidity ratios instead. This was the biggest change in US banking regulation in decades.
What are excess reserves?
Reserves held above the required minimum. US banks hold approximately $3.2 trillion in excess reserves at the Fed, earning interest (IORB rate). This massive excess dampens the money multiplier effect.
How does the reserve ratio affect money supply?
Lower ratio → more lending → more money creation. Higher ratio → less lending → less money. The Fed uses this (along with interest rates) to control inflation and stimulate growth.
What is fractional reserve banking?
Banks keep only a fraction of deposits as reserves and lend the rest. This creates money through the lending process. Critics argue it creates instability; supporters say it enables economic growth.
Key Statistics
Official Data Sources
⚠️ Disclaimer: This calculator is for educational purposes only. Reserve requirements and monetary policy vary by jurisdiction and change over time. Not financial or regulatory advice.
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