Modern Calculator

A Modern Suite of Free Online Calculators

Personal Finance

Mortgage Calculator

Estimate your monthly mortgage payments, including principal, interest, taxes, and insurance. Plan your home financing with clarity.

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Loan Payoff Calculator

Calculate how quickly you can pay off a loan with extra payments. Enter your loan details and see the impact of additional contributions.

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Grow Your Money

Project how steady contributions and compounding can build your savings or investment balance over time.

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Rate of Return

Calculate the annualized rate of return for an investment given initial and final amounts over a period of time.

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Mortgage Points

Determine if buying mortgage points makes financial sense. See the break-even point and visualize long-term savings with our interactive analysis.

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Health & Lifestyle

BMI Calculator

Calculate your Body Mass Index (BMI) to assess your weight category. Works with both metric and imperial units.

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Calorie Calculator

Calculate your daily calorie needs based on age, gender, height, weight, and activity level. Includes BMR and macronutrient breakdown.

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Dog Age Calculator

Convert your dog's age to human years based on their breed size. A more accurate calculation than the simple 'x7' rule.

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