10 Best Free Online Calculators (2026)
The best free online calculators in 2026 — scientific calculator, percentage, BMI, mortgage, tip, GPA, compound interest, and more. All browser-based, no app needed.
The 10 Best Free Online Calculators in 2026
From quick math to complex financial modeling, a good online calculator saves time and eliminates errors. Here are the 10 most useful free calculators on Utilko — optimized, accurate, and instant.
1. Scientific Calculator — Full Math Support
A complete scientific calculator with trigonometric functions, logarithms, powers, square roots, and memory functions. Works on mobile and desktop. Perfect for students and engineers.
2. Percentage Calculator — Quick % Math
Calculate percentages in three modes: what is X% of Y, X is what percent of Y, and percentage change from X to Y. Covers every percentage calculation scenario.
3. BMI Calculator — Health Check
Calculate your Body Mass Index from height and weight. Supports both metric and imperial units. Shows your BMI category (underweight, normal, overweight, obese).
4. Mortgage Calculator — Home Loan Planning
Calculate monthly mortgage payments, total interest paid, and see a full amortization schedule. Adjust interest rate, loan term, and down payment to compare scenarios.
5. Tip Calculator — Split Any Bill
Calculate tips at any percentage and split the bill among any number of people. Includes options for rounding up per person — the most practical calculator for dining out.
6. GPA Calculator — Track Your Academic Performance
Calculate semester GPA from individual course grades and credit hours. Track cumulative GPA across multiple semesters. Supports weighted and unweighted scales.
7. Compound Interest Calculator — Watch Money Grow
See how investments grow over time with compound interest. Adjust principal, interest rate, compounding frequency, and time period. Add regular contributions to model savings plans.
Open Compound Interest Calculator →
8. Age Calculator — Precise Age to the Day
Calculate your exact age in years, months, and days from your birth date. Also shows the day of the week you were born and days until your next birthday.
9. Discount Calculator — Sale Price in Seconds
Enter the original price and discount percentage to get the sale price and total savings. Also works in reverse: enter the sale price to find the original or the discount percentage.
10. Fraction Calculator — Step-by-Step Solutions
Add, subtract, multiply, and divide fractions with full step-by-step solution breakdowns. Handles mixed numbers and automatically simplifies results to lowest terms.
Featured Tools
Try these free tools directly in your browser — no sign-up required.
Scientific Calculator
A full-featured scientific calculator with trigonometric functions, logarithms, exponents, factorials, and more. Perform advanced math calculations in your browser.
Percentage Calculator
Calculate percentages instantly. Find what percent one number is of another, increase/decrease by a percentage, or work out the original value from a percentage.
BMI Calculator
Calculate your Body Mass Index (BMI) using metric or imperial units. Understand your BMI category — underweight, normal, overweight, or obese — instantly.
Mortgage Calculator
Calculate your monthly mortgage payment, total interest paid, and full amortization schedule. Enter loan amount, interest rate, and term to see complete repayment details.
Tip Calculator
Calculate the perfect tip for any bill. Set your tip percentage, split the total among multiple people, and see exactly what everyone owes.
GPA Calculator
Calculate your GPA (Grade Point Average) on a 4.0 or custom scale. Add courses with grades and credit hours to get your cumulative GPA instantly.
Compound Interest Calculator
Calculate compound interest growth with monthly contributions. See how your savings or investments grow over time with daily, monthly, or annual compounding.
Age Calculator
Calculate your exact age in years, months, days, hours, and minutes from your date of birth. Find the age difference between two dates instantly.
Discount Calculator
Find the final price after a discount, the percentage saved, or the original price before a sale. Perfect for shopping, retail pricing, and coupon calculations.
Fraction Calculator
Add, subtract, multiply, and divide fractions and mixed numbers. Get results as simplified fractions and decimals. Ideal for students and everyday math.