Free Online Calculators for Every Need

Calculate your return on investment (ROI) to evaluate profitability of your marketing, business, or personal investments.

Our intuitive Loan Calculator helps you determine your periodic payments and understand the total cost of a loan. Input your loan amount, interest rate, term, and choose a payment frequency to see a detailed breakdown, empowering you to make informed financial decisions.

Estimate how much you need to retire comfortably with our easy-to-use retirement calculator.

Quickly estimate how much your 401k could grow with different contributions, employer matches, and years invested.

Easily calculate your loan’s amortization schedule with monthly breakdowns of principal and interest.

Quickly calculate your Body Mass Index (BMI) to understand if you’re in a healthy weight range for your height.

Quickly calculate your daily calorie needs for weight loss, maintenance, or muscle gain.

Estimate your body fat percentage using our simple Body Fat Calculator. Ideal for tracking fitness, weight loss, and overall health.

Easily calculate your ideal weight based on your height and sex using medically recognized formulas. Includes healthy BMI range and examples.

Calculate percentage of a number, percentage increase or decrease, or what percent one value is of another with our simple tool.

Perform advanced mathematical and engineering calculations instantly with this free online scientific calculator.

A complete Fraction Calculator with tools to handle mixed numbers, simplify fractions, and convert between fractions and decimals.

Find the perfect feeding amount for your pet based on age, weight, and lifestyle.