Free Study Tools for Students
Calculators, converters, and study aids that work offline and never track you.
All Student Tools (17)
Percentage Calculator
Calculate percentages instantly: find X% of Y, percentage change, or what percent X is of Y. Free online percentage calculator - no signup required.
BMI Calculator
Calculate your Body Mass Index (BMI) instantly. Supports metric and imperial units. Free BMI calculator with health category ranges.
Age Calculator
Calculate your exact age in years, months, and days. Find total days lived, weeks, and days until next birthday. Free online age calculator.
Tip Calculator
Calculate tips and split bills instantly. Choose preset or custom tip percentages. Free tip calculator with per-person breakdown.
Calorie Calculator
Calculate your daily calorie needs based on age, gender, weight, height, and activity level. Free TDEE and BMR calculator for weight loss, maintenance, and muscle gain.
Grade Calculator
Calculate your final grade with simple or weighted averages. Free grade calculator for students with letter grade conversion. Add unlimited assignments.
GPA Calculator
Calculate your college GPA on a 4.0 scale. Free GPA calculator with letter grades, credit hours, and quality points. Add unlimited courses instantly.
Macro Calculator
Calculate your daily protein, carb, and fat targets based on your body stats, activity level, and fitness goal. Includes keto, paleo, IIFYM presets and meal-by-meal breakdown.
Body Fat Calculator
Estimate your body fat percentage using 5 methods: US Navy, Jackson-Pollock 3-site, Jackson-Pollock 7-site, BIA, and BMI-based. Compare all results side by side with health range classifications.
Binary to Decimal
Convert binary numbers to decimal, octal, and hexadecimal instantly. Free binary to decimal converter with bidirectional conversion. Great for students and programmers.
Decimal to Binary
Convert decimal numbers to binary, octal, and hexadecimal instantly. Free decimal to binary converter with grouped bit display. Perfect for students and developers.
Number to Words
Convert any number to words instantly. Free number to words converter that spells out numbers in English. Perfect for checks, legal documents, and invoices.
Roman Numeral Converter
Convert between Roman numerals and decimal numbers instantly. Free Roman numeral converter with a reference chart. Supports numbers 1 to 3999.
Temperature Converter
Convert temperatures between Celsius, Fahrenheit, and Kelvin instantly. Free temperature converter with common reference points. Fast and easy to use.
Length Converter
Convert between meters, feet, inches, kilometers, miles, and more. Free length converter with 9 units and instant results. Perfect for construction, travel, and science.
Weight Converter
Convert between kilograms, pounds, ounces, grams, stones, and more. Free weight converter with 7 units and instant results. Great for cooking, fitness, and shipping.
Time Zone Converter
Convert time between world time zones instantly. Free time zone converter with 27 zones, date picker, and popular city quick view. Schedule meetings across the globe.
Why Students Choose Us
100% Private
All tools run in your browser. Your code, data, and content never touch our servers.
Lightning Fast
No waiting for server responses. Calculations happen instantly in your browser.
Works Offline
Once loaded, most tools work without internet. Perfect for working on the go.
Frequently Asked Questions
Are these student tools really free?
Yes, completely free with no hidden limits. We're ad-supported, which keeps everything free for you.
Do I need to create an account?
No signup required for any tool. Just open and use immediately.
Can I use these tools on mobile?
Yes, all tools are fully responsive and work on phones, tablets, and desktops.