500+ Free Online Calculators

Accurate, easy-to-use tools for academics, finance, construction, health and more

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AP Precalc Score Calculator

Use our AP Precalc score calculator to estimate your exam score. Enter your answers to get instant results and optimize your study plan for success.

Income Tax Calculator

Get a quick estimate of your federal income tax liability. A simple tool for tax planning and understanding your potential refund or amount due.

Retaining Wall Cost Calculator

Calculate retaining wall costs with our free tool. Input materials and dimensions for accurate project budgeting.

2 Stroke Oil Mixing Calculator

Mix the perfect 2-stroke oil ratio with our free calculator. Input fuel and oil amounts for accurate results in vehicle maintenance.

Auto Loan Calculator

Estimate your monthly car loan payments. See how interest rate, term, and down payment affect your payment.

Fix and Flip Calculator

Analyze the potential profit and ROI of a fix-and-flip real estate deal. Estimate costs and see your potential return.

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