ToolBoxOnline

🔢 Free Online Calculators — BMI, Loan, Age & Percentage

Free online calculators for everyday use. Calculate BMI, loans, mortgages, age, percentages, tips, discounts, and more. Instant results — no signup required.

17 tools

🎂Calculator

Age Calculator

Calculate exact age in years, months, and days from any birth date.

📊Calculator

Percentage Calculator

Calculate percentages, percentage change, and percentage of a number instantly.

⚖️Calculator

BMI Calculator

Calculate your Body Mass Index (BMI) and see your weight category.

📐Calculator

Unit Converter

Convert between length, weight, temperature, and other units easily.

🔢Calculator

Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal systems.

🏛️Calculator

Roman Numeral Converter

Convert between Roman numerals and Arabic numbers in both directions.

🏦Calculator

Loan Calculator

Calculate monthly payments, total interest, and amortization for loans.

🏠Calculator

Mortgage Calculator

Estimate your monthly mortgage payment with taxes and insurance.

🔥Calculator

Calorie Calculator

Estimate daily calorie needs based on age, weight, height, and activity.

📈Calculator

ROI Calculator

Calculate return on investment (ROI) percentage and profit amount.

💰Calculator

Compound Interest Calculator

See how your money grows over time with compound interest calculations.

💵Calculator

Income Tax Calculator

Estimate your take-home pay after income tax deductions.

💳Calculator

Tip Calculator

Calculate tip amount, split the bill, and figure out per-person cost.

🏷️Calculator

Discount Calculator

Calculate discounted price, savings amount, and discount percentage.

👶Calculator

Pregnancy Due Date Calculator

Estimate your due date based on last menstrual period with trimester info.

🎲Calculator

Random Number Generator

Generate random numbers within a specified range with customizable options.

📅Calculator

Perpetual Calendar

Interactive calendar with world holidays, week numbers, and historical events on any date.