An efficiency ratio measures how well a company uses its resources to generate revenue. In banking, where the term is most commonly used, it’s calculated by dividing non-interest expenses by total revenue. A lower number means the bank spends less to earn each dollar, so lower is better. Most people encounter this term in the context of financial analysis, but the core concept applies across industries, agriculture, and even human physiology.
The Banking Efficiency Ratio
For banks, the efficiency ratio answers a simple question: for every dollar of revenue the bank earns, how many cents go toward overhead? The formula is:
Efficiency Ratio = Non-Interest Expenses ÷ Revenue
Non-interest expenses include everything a bank spends that isn’t directly related to paying interest on deposits: salaries, rent, technology, legal fees, marketing, and general administrative costs. Revenue includes both net interest income (what the bank earns from loans minus what it pays on deposits) and non-interest income (fees, service charges, trading gains, and similar sources).
A bank with an efficiency ratio of 50% spends 50 cents to generate each dollar of revenue. One at 70% spends 70 cents. Among large U.S. banks, ratios typically fall between 50% and 70%, with the most operationally disciplined institutions clustering near the lower end. Community banks and smaller institutions often run higher because they lack the scale to spread fixed costs across a large revenue base.
How Businesses Outside Banking Use It
Non-financial companies use a related metric called the operating ratio. The formula swaps in different components but follows the same logic:
Operating Ratio = (Operating Expenses + Cost of Goods Sold) ÷ Net Sales
Operating expenses cover rent, utilities, wages, and administrative costs. Cost of goods sold captures everything tied directly to producing a product: raw materials, direct labor, equipment maintenance, and production facility costs. Many companies report these two categories separately on their income statements, so you need to add them together before dividing by net sales.
A retailer with an operating ratio of 0.85 keeps 15 cents of every sales dollar as operating profit. A manufacturer at 0.92 keeps only 8 cents. The interpretation is identical to banking: lower means more efficient. One important note for real estate investors: the “operating expense ratio” in property management is a different calculation entirely, dividing a property’s operating expenses (minus depreciation) by its gross operating income. Despite the similar name, it measures something distinct from business operating efficiency.
What Counts as a Good Ratio
There’s no universal benchmark because efficiency ratios vary dramatically by industry. Capital-intensive businesses like airlines or heavy manufacturing naturally carry higher operating ratios than software companies with minimal physical infrastructure. In banking, anything below 50% is considered excellent, 50% to 60% is strong, and above 70% signals that overhead may be eating into profitability.
The ratio is most useful when you compare it against direct competitors or track it over time within the same company. A bank’s efficiency ratio climbing from 55% to 65% over three years tells you costs are growing faster than revenue, even if both numbers are increasing. That trend matters more than the absolute figure in isolation.
How Banks Improve Their Ratio
Banks can push their efficiency ratio lower by either cutting expenses or growing revenue, but sustainable improvement usually requires both. The most common strategies fall into a few categories.
Digitizing workflows is one of the biggest levers. Automating loan processing, using electronic documents, and introducing automated routing for routine tasks reduces the staff hours needed per transaction. Banks that invest in process improvement typically start by measuring how long each step takes, then rethink the workflow from scratch rather than just speeding up existing steps.
Workforce productivity also plays a role. Setting clear performance expectations, using scorecards, and improving training can raise output without adding headcount. Better motivation and reward systems, particularly ones tied to serving customers more effectively rather than just faster, tend to produce lasting gains.
Strategic realignment matters too. Banks that exit low-margin business lines and shift toward inherently more cost-effective ones, like specialty financing or payment processing, can improve their ratio structurally. Leading banks assess the minimum resources needed to compete in each business line and focus only on areas where they can differentiate themselves. Vendor management is another overlooked area: negotiating service-level agreements and monitoring third-party performance through scorecards helps squeeze more value from outside relationships.
Cost-cutting alone doesn’t produce sustainable efficiency. Banks that slash too aggressively risk degrading service quality and losing the revenue side of the equation.
Efficiency Ratios Beyond Finance
The concept of measuring output relative to input appears in many fields, often under different names.
Feed Conversion in Agriculture
Livestock producers use feed conversion efficiency to measure how many pounds of feed an animal needs to gain one pound of body weight. The calculation is straightforward: divide the daily feed ration by the animal’s average daily weight gain. A market hog that eats 3 pounds of feed to gain 1 pound has a feed conversion ratio of 3:1.
Benchmarks vary by species. Efficient cattle convert feed at about 4.5 pounds per pound of gain, while less efficient cattle may require 7.5 pounds. Modern hogs finished at 250 pounds achieve ratios around 2.6:1, a significant improvement over hogs from 50 years ago that needed roughly 3.5 pounds of feed per pound gained. These improvements reflect decades of genetic selection, better nutrition, and improved management practices.
Human Muscle Efficiency
Even the human body has an efficiency ratio. During exercise like cycling, your muscles convert chemical energy from food into mechanical work, but most of that energy escapes as heat. Gross mechanical efficiency, the percentage of energy that actually moves the pedals, ranges from about 8% to 19% depending on how hard you’re working. At light effort (30 watts), efficiency sits around 8% to 11%. At moderate effort (120 watts), it climbs to roughly 18% to 19%. Delta efficiency, a measure of how much additional energy converts to work as intensity increases, averages about 26%.
In cardiology, heart efficiency follows a similar principle: the ratio of the heart’s external pumping work to the oxygen it consumes. Researchers estimate this by dividing stroke work (roughly, stroke volume multiplied by blood pressure) by the heart’s oxygen uptake. This metric helps clinicians assess how well the heart converts fuel into actual blood flow, particularly in patients with heart failure where the ratio drops.
Limitations to Keep in Mind
Efficiency ratios are snapshots, not complete pictures. A bank could have a low efficiency ratio because it underinvests in technology or staff development, creating problems that won’t surface until later. A company could temporarily improve its operating ratio by deferring maintenance or cutting research spending, borrowing from future performance to look lean today.
The ratio also doesn’t account for risk. Two banks with identical efficiency ratios might have very different risk profiles depending on their loan portfolios and capital reserves. And comparing across industries is essentially meaningless: a 60% ratio that’s excellent for a bank would signal trouble for a high-margin software firm. Use the ratio as one tool among several, comparing like with like and watching trends rather than fixating on a single number.