The Smartest Free
Calculator Suite Online
Grade calculator, GPA tracker, tip splitter, percentage finder, loan planner, and secure password generator — all in one place, all completely free.
All Free Calculators
Choose a tool below. Every calculation happens instantly in your browser — no data leaves your device.
Grade Calculator
Calculate simple grades, weighted averages, letter grades, and cumulative GPA. Perfect for students and teachers.
Open calculator →Tip Calculator
Calculate the right tip and split any restaurant bill evenly among any number of people. Includes tipping guide.
Open calculator →Percentage Calculator
Find what percentage of a number is, calculate discounts, reverse percentages, and percentage change.
Open calculator →Loan Calculator
Calculate monthly payments and total interest for mortgages, car loans, student loans, and personal loans.
Open calculator →Password Generator
Generate cryptographically secure random passwords. Customize length and character types. Nothing sent to servers.
Open generator →Score Calculator
Convert any score (X out of Y) to a percentage and letter grade instantly. Works for any test or quiz.
Open calculator →Final Grade Calculator
Find out exactly what score you need on your final exam to achieve your target course grade.
Open calculator →CGPA Calculator
Convert CGPA to percentage and back. Supports Anna University, VTU, and multiple university formulas.
Open calculator →Grade Average Calculator
Calculate your simple, weighted, or letter grade average. See your current standing at a glance.
Open calculator →Overall Grade Calculator
Calculate your weighted overall course grade from multiple graded categories and assignments.
Open calculator →Grading Chart
Instant score-to-grade tables for any test size. Presets for 10, 20, 25, 30, 40, and 50 question tests.
Open chart →Test Score Calculator
Enter questions right or wrong to get your percentage and letter grade. Two modes for students and teachers.
Open calculator →Teacher Grader
Grade an entire class at once. Get class average, high/low scores, and pass rate. Export to spreadsheet.
Open grader →Percentage to Letter Grade
Convert any percentage to a letter grade and GPA. Bulk conversion for multiple scores at once.
Open calculator →AP Score Calculator
Estimate your AP exam score (1–5) for 13 AP subjects including AP Lang, AP Chem, AP Calculus, and more.
Open calculator →Middle School GPA Calculator
Calculate your middle school GPA with optional honors weighting. Standard 4.0 scale.
Open calculator →MCAT Score Calculator
Convert raw or section scores to the MCAT 472–528 scale. Includes percentile estimates.
Open calculator →LSAT Score Calculator
Convert raw correct answers to the LSAT 120–180 scale with percentile range estimates.
Open calculator →Dividend Calculator
Calculate dividend income, yield, and DRIP reinvestment growth from your stock investments.
Open calculator →Time and a Half Calculator
Calculate overtime pay at 1.5× and double time. See your total weekly earnings breakdown.
Open calculator →Reverse Sales Tax Calculator
Find the pre-tax price from any total. Works for US sales tax and international VAT.
Open calculator →Property Tax Calculator
Estimate annual property taxes from your home value, assessment ratio, and local mill rate.
Open calculator →Dividend Yield Calculator
Calculate dividend yield percentage and compare two stocks side by side. Includes yield assessment.
Open calculator →Reverse Tax Calculator
Convert net pay to gross, gross to net, and calculate your effective tax rate. Includes 2024 federal brackets.
Open calculator →Simplify Fractions Calculator
Reduce any fraction to lowest terms instantly. Shows GCF used and step-by-step work. Bulk mode included.
Open calculator →Cylinder Volume Calculator
Calculate volume, surface area, and lateral area of any cylinder. Supports metric and imperial units.
Open calculator →Proportion Calculator
Solve for the missing value in any a/b = c/d proportion using cross-multiplication. Includes scale tool.
Open calculator →Quadratic Equation Calculator
Solve ax² + bx + c = 0 instantly. Shows discriminant, real and complex roots, vertex, and step-by-step work.
Open calculator →Inequality Calculator
Solve linear inequalities like 2x + 3 > 7. Shows solution, interval notation, and number line graph.
Open calculator →Percentage Decrease Calculator
Find the % decrease between two values, the new value after a drop, or reverse-calculate the original.
Open calculator →GCF Calculator
Find the greatest common factor of two or more numbers. Shows prime factorization, all factors, and LCM.
Open calculator →Age Calculator
Calculate your exact age in years, months, days, and hours. Find days until your next birthday.
Open calculator →BMI Calculator
Calculate Body Mass Index in metric or imperial. Shows your BMI category and healthy weight range.
Open calculator →Dog Age Calculator
Convert dog years to human years using the accurate size-based formula — not the outdated "multiply by 7" rule.
Open calculator →Gravel Calculator
Calculate cubic yards, cubic feet, and tons of gravel or crushed stone needed for any project area.
Open calculator →Concrete Block Calculator
Find how many CMU / cinder blocks you need for a wall. Includes mortar bags and cost estimate.
Open calculator →Why CalcBright
Instant Results
No loading screens. Calculations happen as you type.
Fully Private
Everything runs in your browser. We see nothing.
Mobile Ready
Works perfectly on phones, tablets, and desktops.
Highly Accurate
Standard formulas used by educators and lenders.
Always Free
No account required. No paid tiers. Free forever.
Accessible
WCAG 2.1 AA compliant. Screen reader friendly.
Frequently Asked Questions
Everything you need to know about CalcBright.
About CalcBright
CalcBright provides free, accurate, and private online calculators for students, educators, and everyday users. Whether you need to calculate your final grade before exams, figure out the tip on a dinner bill, plan a loan payment, or create a strong password — CalcBright has you covered.
Our grade calculator supports simple grade conversion, weighted grade averages, and full GPA calculation using the standard 4.0 scale. The tip calculator makes splitting restaurant bills effortless for any group size.
All tools are built with modern web standards, zero external dependencies, and a strong commitment to user privacy. No accounts, no trackers on your calculations, no data sold.