Calculators

About Calculators

iToolz offers 12 free calculators that run entirely in your browser. No sign-up, no data collection, no limits. Every tool is instant and works on any device — desktop, tablet, or mobile.

Available Tools

• Percentage Calculator — Calculate percentages, percentage increases, decreases, and ratios with step-by-step breakdowns
• Age Calculator — Calculate your exact age in years, months, days, hours, and minutes with zodiac sign and birthday countdown
• BMI Calculator — Calculate your Body Mass Index, view your health category, and get personalized weight range recommendations
• Discount Calculator — Calculate final sale prices, total savings, and compare multiple discount percentages side by side
• Tip Calculator — Calculate tips at any percentage and split the total bill evenly between any number of people
• Loan Calculator — Calculate monthly loan payments, total interest, and view a full amortization schedule for any loan
• Compound Interest Calculator — Visualize how your investments grow over time with compound interest, contributions, and compounding frequency
• Date Difference Calculator — Calculate the exact number of days, weeks, months, and years between any two dates you choose
• Salary Converter — Convert your salary between hourly, daily, weekly, bi-weekly, monthly, and yearly rates instantly
• Percentage Change Calculator — Calculate the percentage increase or decrease between any two values with clear visual indicators
• GPA Calculator — Calculate your Grade Point Average by entering course grades and credit hours with weighted support
• Fuel Cost Calculator — Estimate total fuel costs for any trip based on distance, vehicle efficiency, and current fuel prices