Free Online Calculators
12 free tools — crunch numbers with specialized calculators for every need
Specialized calculators for everyday math, finance, health, education, and more. Calculate percentages, determine your BMI, plan loan payments, compute compound interest, convert salaries between time periods, and work with dates. Each calculator provides clear results with step-by-step breakdowns where applicable. All calculations happen instantly in your browser with no server communication — your financial data, health metrics, and personal information stay completely private.
All Calculators (12)
Percentage Calculator
Calculate percentages, percentage increases, decreases, and ratios with step-by-step breakdowns
PopularAge Calculator
Calculate your exact age in years, months, days, hours, and minutes with zodiac sign and birthday countdown
PopularBMI Calculator
Calculate your Body Mass Index, view your health category, and get personalized weight range recommendations
PopularLoan Calculator
Calculate monthly loan payments, total interest, and view a full amortization schedule for any loan
Tip Calculator
Calculate tips at any percentage and split the total bill evenly between any number of people
Discount Calculator
Calculate final sale prices, total savings, and compare multiple discount percentages side by side
Compound Interest Calculator
Visualize how your investments grow over time with compound interest, contributions, and compounding frequency
Salary Converter
Convert your salary between hourly, daily, weekly, bi-weekly, monthly, and yearly rates instantly
GPA Calculator
Calculate your Grade Point Average by entering course grades and credit hours with weighted support
Date Difference Calculator
Calculate the exact number of days, weeks, months, and years between any two dates you choose
Fuel Cost Calculator
Estimate total fuel costs for any trip based on distance, vehicle efficiency, and current fuel prices
Percentage Change Calculator
Calculate the percentage increase or decrease between any two values with clear visual indicators
Why Use itoolz for Calculators?
Step-by-step breakdowns show how results are calculated
Covers finance, health, education, and everyday math
No personal data collected — calculations stay on your device
Instant results with no loading or processing delays
Mobile-friendly for on-the-go calculations
12 specialized calculators covering common needs