Calculators Library

Free online financial calculators for loans, investments, budgeting, taxes, and property planning. All calculations happen in your browser for complete privacy—no accounts required.

Percentage Calculators

2 calculators

Percent of a Value

Find the exact value represented by X% of any base number.

What Percent is This?

See what percentage one number is of another.

Health & Wellness

7 calculators

BMI Calculator

Enter height and weight to view BMI and weight category.

BMR Calculator

Calculate resting calorie burn based on age, gender, height, and weight.

Body Fat Calculator

Estimate body fat percentage using tape measurements.

Ideal Weight Calculator

Find your ideal weight range based on height and gender.

Calorie Calculator

Estimate daily calorie needs for maintenance or weight loss.

Pregnancy Due Date Calculator

Estimate due date and see a pregnancy timeline.

Ovulation Calculator

Predict ovulation and fertile windows.

Investment & Growth

5 calculators

Compound Interest

See exponential growth through compound interest.

Simple Interest

Calculate simple interest accumulation.

Investment Return Calculator

Track ROI, CAGR, and total return across portfolios and one-off investments.

Inflation Calculator

Understand inflation's impact on purchasing power.

Historical Inflation

Calculate past value of money adjusted for inflation.

Debt & Loans

9 calculators

Loan Payment Calculator

Calculate monthly payments for any loan type with amortization.

Personal Loan Calculator

Calculate monthly installments for personal loans.

Auto Loan Calculator

Compute monthly payments and interest costs for car loans.

Mortgage Calculator

Plan mortgage payments with amortization and prepayment options.

Interest Saving Calculator

See how extra payments can save you thousands in interest.

Loan Payoff Planner

Calculate savings from making extra principal payments.

Loan Payoff Goal

Set a payoff date and see how much you need to pay monthly.

Debt Payoff Strategy

Compare Avalanche vs Snowball methods for paying off debt.

Accelerated Payoff

See how fast you can be debt-free with extra payments.

Planning & Tracking

8 calculators

Net Worth Tracker

Calculate your assets vs liabilities for a complete financial picture.

Budget Allocator

Allocate income using the 50/30/20 rule.

Savings Goal Calculator

Calculate how much to save monthly to reach your goal.

Retirement Planner

Plan your retirement savings and income needs.

Solar Savings Calculator

Estimate solar payback timelines and lifetime savings.

Age Calculator

Calculate age and time between dates.

Date Calculator

Calculate exact duration between any two dates.

Age Difference

Find the exact difference between two ages or dates.

Property & Taxes

2 calculators

Rental Yield Calculator

Calculate return on investment for rental properties.

Capital Gains Tax

Estimate capital gains tax on investments.

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Calculators Are Free & Private

Every financial calculator runs directly in your browser. We never see your data, and no accounts are required. Start calculating with confidence today.

Calculate Smartly

Calculate Smartly provides free calculators and practical converters for loans, savings, investing, budgeting, property decisions, and everyday math.

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Percentage Calculators

Debt & Loans

Planning & Tracking

Property & Taxes

Health & Wellness

Investment & Growth

Unit Converters

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