Curated collection of the best free calculators — all work in your browser with no signup required.
Finding the right online tool can save you hours of work. We've curated this list of the best free calculators available in 2026. Every tool on this list is:
Calculate compound interest with customizable frequency, additional contributions, and visual growth chart.
See how extra payments reduce your mortgage term and total interest. Create an amortization schedule.
Compare multiple loan options side by side. See total cost, monthly payments, and interest for each.
Calculate your Body Mass Index instantly. Supports both metric and imperial units.
Calculate percentages, percentage change, percentage difference, and reverse percentages.
Calculate your exact age in years, months, days, hours, and minutes.
Determine your daily calorie needs based on activity level, age, weight, and goals.
Calculate your Total Daily Energy Expenditure for accurate calorie planning.
Convert between hourly, monthly, and annual salary. Factor in taxes and deductions.
Calculate Systematic Investment Plan returns with compound growth visualization.