fizzybook

Free Accounting Formulas & Financial Ratios

Understanding accounting formulas and financial ratios is essential for making sound business decisions. Fizzybook offers 10 interactive formula calculators covering the core concepts every accountant, business owner, and finance student needs to master. From the fundamental accounting equation that underpins all of double-entry bookkeeping to advanced profitability and liquidity ratios, each tool explains the formula, shows you how to apply it, and calculates the result instantly.

Our business formulas span four critical categories: profitability ratios like gross profit margin, net income, and return on assets; liquidity ratios including the quick ratio (acid test); leverage ratios such as debt-to-equity; and efficiency ratios like inventory turnover and accounts receivable aging. We also include a practical 1099 vs W-2 comparison tool for evaluating the true cost of hiring contractors versus employees.

Every formula calculator is completely free, requires no signup, and runs in your browser. Use them for homework, client analysis, business planning, or quick reference during tax season.

A = L + EFoundation

Accounting Equation

The accounting equation (Assets = Liabilities + Equity) is the foundation of double-entry bookkeeping. Every business transaction affects at least two accounts while keeping this equation in balance. Use our calculator to verify that your balance sheet balances correctly.

Open Formula →
Revenue − COGS − ExpensesProfitability

Net Income Formula

Net income, also called the bottom line, measures how much profit remains after subtracting cost of goods sold, operating expenses, interest, and taxes from total revenue. This is the most important number on your income statement and directly affects retained earnings on the balance sheet.

Open Formula →
(Sales − COGS) / SalesProfitability

Gross Profit Margin

Gross profit margin shows what percentage of revenue remains after covering direct production costs (COGS). A higher gross margin means more money available to cover operating expenses and generate profit. This ratio is essential for evaluating pricing strategy and production efficiency.

Open Formula →
Beg RE + NI − DividendsEquity

Retained Earnings

Retained earnings represent the cumulative net income a business has kept rather than distributing to shareholders as dividends. This formula connects the income statement to the balance sheet and is critical for understanding how profits are reinvested in the business over time.

Open Formula →
Liabilities / EquityLeverage

Debt-to-Equity Ratio

The debt-to-equity ratio measures financial leverage by comparing total liabilities to total shareholders' equity. A ratio above 2.0 generally indicates high leverage and greater financial risk. Lenders and investors use this ratio to assess a company's ability to handle its debt obligations.

Open Formula →
(Cash + AR + ST Inv) / CLLiquidity

Quick Ratio (Acid Test)

The quick ratio, also called the acid-test ratio, measures a company's ability to pay current liabilities using only its most liquid assets: cash, accounts receivable, and short-term investments. Unlike the current ratio, it excludes inventory. A quick ratio above 1.0 suggests strong short-term liquidity.

Open Formula →
COGS / Avg InventoryEfficiency

Inventory Turnover

Inventory turnover measures how many times a company sells and replaces its inventory during a period. A higher ratio indicates efficient inventory management and strong sales. Low turnover may signal overstocking, obsolete products, or weak demand. Industry benchmarks vary widely.

Open Formula →
Days Since InvoiceEfficiency

Accounts Receivable Aging

Accounts receivable aging categorizes outstanding invoices by the length of time they have been unpaid: current, 1-30 days, 31-60 days, 61-90 days, and 90+ days. This analysis helps businesses identify collection problems, estimate bad debt expense, and manage cash flow effectively.

Open Formula →
NI / Avg Total AssetsProfitability

Return on Assets (ROA)

Return on assets measures how efficiently a company uses its total assets to generate profit. ROA is calculated by dividing net income by average total assets. A higher ROA indicates more efficient asset utilization. This ratio is particularly useful for comparing companies within the same industry.

Open Formula →
Contractor vs EmployeeTax

1099 vs W-2 Comparison

This comparison calculator shows the true cost difference between hiring a 1099 independent contractor and a W-2 employee. It factors in employer payroll taxes (FICA, FUTA, SUTA), workers' compensation, benefits, and overhead to reveal the actual cost of each arrangement.

Open Formula →

Frequently Asked Questions About Accounting Formulas

What are the most important accounting formulas?▼
The most important accounting formulas are the accounting equation (Assets = Liabilities + Equity), net income (Revenue - COGS - Expenses), gross profit margin ((Sales - COGS) / Sales), and retained earnings (Beginning RE + Net Income - Dividends). These four formulas form the backbone of financial reporting and connect the three primary financial statements: the balance sheet, income statement, and statement of retained earnings.
What financial ratios should I track for my business?▼
Small businesses should track at least four types of financial ratios: profitability ratios (gross profit margin, net profit margin, ROA), liquidity ratios (quick ratio, current ratio), efficiency ratios (inventory turnover, accounts receivable aging), and leverage ratios (debt-to-equity). Together, these give you a comprehensive picture of your financial health, helping you spot problems early and make informed decisions.
What is a good quick ratio?▼
A quick ratio of 1.0 or higher is generally considered healthy, meaning a business can cover its current liabilities with liquid assets alone. A ratio between 1.0 and 1.5 is typical for most industries. Ratios below 1.0 may signal liquidity risk, while very high ratios (above 3.0) could indicate that cash is not being deployed efficiently. The ideal quick ratio depends on your industry and business model.
How do I calculate gross profit margin?▼
Gross profit margin is calculated by subtracting the cost of goods sold (COGS) from total sales, then dividing by total sales: (Sales - COGS) / Sales. Multiply by 100 to express it as a percentage. For example, if your sales are $500,000 and COGS is $300,000, your gross profit margin is ($500,000 - $300,000) / $500,000 = 40%. This tells you that 40 cents of every sales dollar remains after covering direct production costs.
What is the difference between a 1099 contractor and a W-2 employee?▼
A W-2 employee works under the direct control of the employer, who withholds income taxes and pays the employer share of FICA (7.65%), FUTA, and state unemployment taxes. A 1099 contractor is self-employed, pays their own self-employment tax (15.3%), and receives no benefits. While contractors may have a higher hourly rate, the total cost to the employer is often lower because there are no payroll taxes, benefits, or workers' compensation to pay.
What is a healthy debt-to-equity ratio?▼
A debt-to-equity ratio below 2.0 is generally considered acceptable, but the ideal ratio varies by industry. Capital-intensive industries like utilities and manufacturing often have ratios above 2.0, while technology and service companies typically maintain ratios below 1.0. A lower ratio means less financial leverage and lower risk, but too little debt may indicate that a company is not taking advantage of tax-deductible interest to grow.
How is inventory turnover calculated?▼
Inventory turnover is calculated by dividing the cost of goods sold (COGS) by average inventory: COGS / ((Beginning Inventory + Ending Inventory) / 2). A higher number means inventory is selling quickly. Grocery stores may have turnover ratios of 15-20, while furniture stores might see ratios of 4-6. You can also calculate days sales of inventory by dividing 365 by the turnover ratio to see how many days inventory sits before being sold.
What does return on assets (ROA) tell you?▼
Return on assets tells you how much profit a company generates for every dollar of assets it owns. An ROA of 10% means the company earns $0.10 of net income for every $1.00 in assets. ROA above 5% is generally considered good, while above 20% is excellent. Asset-light businesses like software companies tend to have higher ROA than asset-heavy businesses like manufacturing. ROA is most useful when comparing companies within the same industry.