fizzybook

Free Accounting & Financial Calculators

Fizzybook provides 14 free financial calculatorsbuilt specifically for accountants, small business owners, freelancers, and anyone who needs fast, accurate number crunching without the clutter. Whether you are preparing tax returns, evaluating a business loan, setting prices for a new product, or projecting next quarter's cash flow, our accounting calculators give you professional-grade results in seconds.

Our collection covers every major category of business calculators you need: depreciation schedules using MACRS, straight-line, and Section 179 methods; payroll withholding and net pay; self-employment and quarterly estimated tax calculators for freelancers and contractors; profit margin and break-even analysis for pricing strategy; loan amortization schedules; ROI and capital gains calculations for investment decisions; and deduction calculators for home offices and business mileage.

Every calculator runs entirely in your browser with no signup, no ads, and no data collection. Results update instantly as you type, and you can export or print schedules for your records. Bookmark this page to keep all 14 free financial calculators one click away.

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Depreciation Calculator

MACRS, Straight-Line, Section 179

Calculate asset depreciation using MACRS, straight-line, double declining balance, or sum-of-years-digits methods. Includes Section 179 deduction and bonus depreciation schedules for the current tax year. Essential for accountants preparing fixed asset schedules and tax returns.

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Payroll Calculator

Federal & State Withholding, FICA, Net Pay

Calculate employee payroll including federal and state tax withholding, Social Security, Medicare, FUTA, and net pay. Supports all filing statuses and pre-tax deduction types. Built for small business owners who need quick, accurate payroll estimates.

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Self-Employment Tax Calculator

SE Tax, Social Security & Medicare

Estimate your self-employment tax liability including Social Security, Medicare, and Additional Medicare Tax. See your deductible half, effective SE tax rate, and total obligation. Designed for freelancers, contractors, and sole proprietors filing Schedule SE.

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Quarterly Estimated Tax Calculator

1040-ES Payments & Safe Harbor

Calculate your quarterly estimated tax payments for federal income tax and self-employment tax. Includes safe harbor calculation to avoid underpayment penalties, due dates for each quarter, and 1040-ES payment amounts.

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Profit Margin Calculator

Gross Margin, Net Margin & Markup

Calculate gross profit margin, net profit margin, and markup percentage for any product or service. Compare margin vs. markup side-by-side and understand how pricing decisions affect your bottom line.

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Loan Amortization Calculator

Monthly Payments & Amortization Schedule

Generate a full amortization schedule showing principal, interest, and remaining balance for each payment. Works for business loans, mortgages, auto loans, and personal loans. See total interest paid over the life of the loan.

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Break-Even Calculator

Units, Revenue & Contribution Margin

Find your break-even point in units and revenue dollars. Enter fixed costs, variable cost per unit, and selling price to see exactly how many units you need to sell to cover all costs. Includes contribution margin analysis.

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Sales Tax Calculator

All 50 States & Reverse Calculation

Calculate sales tax for any US state with current rates. Includes reverse sales tax calculation to extract the pre-tax price from a total. Supports all 50 states with accurate, up-to-date rates.

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ROI Calculator

Return on Investment & Annualized ROI

Calculate return on investment as a percentage, including annualized ROI for multi-year investments. Enter your initial investment and final value to see total gain, ROI percentage, and annualized rate of return.

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Home Office Deduction Calculator

Simplified vs. Actual Expense Method

Compare the simplified method ($5 per square foot, up to 300 sq ft) and the actual expense method for your home office tax deduction. See which method gives you a larger deduction and maximize your tax savings.

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Mileage Deduction Calculator

IRS Standard Mileage Rate

Calculate your business mileage tax deduction using the IRS standard mileage rate. Enter your total business miles for the year and see your deduction amount. Tracks the current IRS rate for business, medical, and charitable miles.

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Cost of Goods Sold (COGS) Calculator

Inventory, Purchases & Gross Profit

Calculate cost of goods sold from beginning inventory, purchases, and ending inventory. COGS is a critical figure for determining gross profit, filing business tax returns, and understanding your true product costs.

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Cash Flow Projection Calculator

Monthly Income & Expense Forecast

Project your monthly cash flow with customizable income and expense line items. See running cash balances and identify potential shortfalls before they happen. Essential for small business financial planning and loan applications.

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Capital Gains Tax Calculator

Short-Term & Long-Term Rates

Calculate capital gains tax on stocks, investments, and property sales. See the difference between short-term and long-term capital gains rates based on your income and filing status. Includes net investment income tax calculation.

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Frequently Asked Questions About Financial Calculators

What is the best free financial calculator?▼
The best free financial calculator depends on your specific needs. For small business owners, a profit margin calculator or break-even calculator helps with pricing decisions. Freelancers benefit most from a self-employment tax calculator and quarterly estimated tax calculator. Fizzybook offers all 14 of these calculators completely free, with no signup required and no ads.
How do I calculate depreciation for tax purposes?▼
For tax purposes, most business assets are depreciated using the Modified Accelerated Cost Recovery System (MACRS), which the IRS requires for tangible property. You need to know the asset cost, recovery period (3, 5, 7, 10, 15, 20, 27.5, or 39 years), and the applicable convention (half-year or mid-quarter). Many businesses also take advantage of Section 179, which allows you to deduct the full cost of qualifying assets in the year of purchase, up to $1,220,000 for 2024.
What is the self-employment tax rate for 2024?▼
The self-employment tax rate for 2024 is 15.3% on net self-employment earnings. This consists of 12.4% for Social Security (on earnings up to $168,600) and 2.9% for Medicare (on all earnings). An Additional Medicare Tax of 0.9% applies to earnings above $200,000 for single filers or $250,000 for married filing jointly. You can deduct the employer-equivalent portion (half) of your SE tax on your Form 1040.
How do I calculate quarterly estimated taxes?▼
Quarterly estimated taxes are calculated by estimating your total tax liability for the year (including income tax and self-employment tax), subtracting any withholding, and dividing the remainder into four equal payments. Due dates are April 15, June 15, September 15, and January 15 of the following year. To avoid underpayment penalties, you must pay at least 90% of your current year tax or 100% of your prior year tax (110% if your AGI exceeded $150,000).
What is a good profit margin for a small business?▼
A good net profit margin varies significantly by industry. Service-based businesses like consulting and accounting typically achieve 15-25% net margins. Retail businesses usually see 2-5%, while restaurants average 3-9%. Software and technology companies can reach 20-40%. Gross profit margins are generally higher: 50-70% for services and 30-50% for retail. The key is benchmarking your margin against others in your specific industry.
How does loan amortization work?▼
Loan amortization is the process of paying off a loan through regular, fixed payments over a set period. Each payment is split between principal and interest. In the early years, a larger portion goes toward interest, while later payments are mostly principal. An amortization schedule shows this breakdown for every payment. Understanding amortization helps you see total interest costs and evaluate whether extra payments or refinancing would save you money.
What is break-even analysis?▼
Break-even analysis determines the point at which your total revenue equals your total costs, meaning you are neither making a profit nor incurring a loss. The formula is: Break-Even Units = Fixed Costs / (Selling Price - Variable Cost per Unit). This is critical for pricing decisions, evaluating new products, and understanding how changes in costs or pricing affect profitability. The contribution margin (selling price minus variable cost) is the key driver.
How do I calculate ROI?▼
Return on Investment (ROI) is calculated as: (Net Profit / Cost of Investment) x 100. For example, if you invest $10,000 and receive $12,000 back, your ROI is 20%. For investments held over multiple years, annualized ROI gives a more meaningful comparison: Annualized ROI = ((1 + ROI) ^ (1/years)) - 1. This allows you to compare investments of different durations on an equal basis.
What is the IRS mileage rate for 2024?▼
The IRS standard mileage rate for 2024 is 67 cents ($0.67) per mile for business use of a vehicle. The rate for medical or moving purposes (military only) is 21 cents per mile, and charitable driving is 14 cents per mile. To use the standard mileage rate, you must choose it in the first year you use the car for business. You can alternatively deduct actual vehicle expenses, but you cannot use both methods for the same vehicle.
How do I calculate capital gains tax?▼
Capital gains tax is calculated on the profit from selling an asset. First, determine your gain: Sale Price minus Purchase Price minus any selling expenses. Short-term gains (assets held one year or less) are taxed as ordinary income at your marginal tax rate, which can be as high as 37%. Long-term gains (held more than one year) are taxed at preferential rates of 0%, 15%, or 20% depending on your taxable income and filing status.