🔢 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
Age Calculator
Calculate exact age in years, months, and days from any birth date.
Percentage Calculator
Calculate percentages, percentage change, and percentage of a number instantly.
BMI Calculator
Calculate your Body Mass Index (BMI) and see your weight category.
Unit Converter
Convert between length, weight, temperature, and other units easily.
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal systems.
Roman Numeral Converter
Convert between Roman numerals and Arabic numbers in both directions.
Loan Calculator
Calculate monthly payments, total interest, and amortization for loans.
Mortgage Calculator
Estimate your monthly mortgage payment with taxes and insurance.
Calorie Calculator
Estimate daily calorie needs based on age, weight, height, and activity.
ROI Calculator
Calculate return on investment (ROI) percentage and profit amount.
Compound Interest Calculator
See how your money grows over time with compound interest calculations.
Income Tax Calculator
Estimate your take-home pay after income tax deductions.
Tip Calculator
Calculate tip amount, split the bill, and figure out per-person cost.
Discount Calculator
Calculate discounted price, savings amount, and discount percentage.
Pregnancy Due Date Calculator
Estimate your due date based on last menstrual period with trimester info.
Random Number Generator
Generate random numbers within a specified range with customizable options.
Perpetual Calendar
Interactive calendar with world holidays, week numbers, and historical events on any date.