RubanTools

Free Study & Academic Tools

18 curated tools for students - plan your study schedule, track attendance, calculate GPA, generate MCQs and build your resume. All free.

Study Timer

Subject-labelled study session timer with Pomodoro mode, daily goal tracking, per-subject breakdown and session log saved in localStorage.

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Pomodoro Timer

Focus with 25-min work sessions and short breaks. Configurable cycles, SVG progress ring, auto-start, and browser notifications.

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Timetable Generator

Build a weekly class or study timetable with color-coded subjects - choose days, time slots and duration, then print or save as PDF.

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GPA & SGPA Calculator

Calculate SGPA for a semester and CGPA across multiple semesters. Supports 10-point and 4-point grading scales with subject-wise grade entry.

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GPA Planner

Find the SGPA you need each remaining semester to achieve your target CGPA - ideal for recovering from a bad semester or planning your academic path.

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Attendance Calculator

Check your attendance %, find how many classes you can skip before hitting 75%, or calculate classes needed to recover - exam eligibility in seconds.

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Marks % Calculator

Convert marks to percentage with CBSE, ICSE and college grade scales - or find how many marks you need to hit a target percentage.

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CGPA to Percentage

Convert CGPA to percentage using CBSE (×9.5), Anna University (×10), VTU, or a custom formula. Reverse conversion included.

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Rank Predictor

Predict your rank from exam score for JEE Main, NEET, CAT, GATE (CS/EC/ME) and CUET using historical percentile-rank data.

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MCQ Generator

Build a multiple-choice quiz with 4-option questions, correct answer key, marks per question and per-student answer fields - print or export.

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Notes Formatter

Convert plain text to structured study notes with headings, bullets, highlights and blockquotes - Markdown-like syntax with print and HTML export.

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Grade Calculator

Convert marks to grade letters and percentages across CBSE, Anna University, UGC CBCS and US letter grading schemes. Enter multiple subjects.

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Exam Age Eligibility

Check your age eligibility for UPSC CSE, SSC CGL, IBPS PO, RRB NTPC, NDA and 25+ major govt exams - including OBC, SC/ST, PwD age relaxation.

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Resume / CV Builder

Build an ATS-friendly resume with live preview - work experience, education, skills, projects and certifications. Download as PDF via browser print.

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Scientific Calculator

Full scientific functions - sin, cos, log, powers, roots, π and more. Respects BODMAS with a proper expression evaluator.

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Percentage Calculator

Three modes in one: find X% of a number, find what % one value is of another, or calculate % increase or decrease.

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Word & Character Counter

Live word, character, sentence and paragraph count with reading time, speaking time and top keyword frequency.

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Age Calculator

Find your exact age in years, months and days. Includes next birthday countdown, zodiac sign, and live seconds ticker.

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Other Professional Kits

For Accountants

GST calculator, invoice generator, TDS, income tax, salary and compliance tools for Indian accountants.

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For Developers

JSON, Base64, hash, UUID, regex, diff, image tools, SEO generators and more for web developers.

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For Doctors & Healthcare

BMI, BMR, calorie, body fat, pregnancy, ovulation and other clinical calculators for healthcare professionals.

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For Real Estate

Area converters, stamp duty, home loan EMI, Vastu compliance and land-unit converters for property professionals.

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For Astrologers

Numerology charts, compatibility, gemstone finder, Vastu and festival date tools for practising astrologers.

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For Designers & UI Developers

Color picker, gradient generator, border-radius, box-shadow, SVG blob, glassmorphism, CSS grid, font pairing, image tools and more for designers.

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For Teachers & Trainers

MCQ generator, question paper builder, grade calculator, marksheet, attendance sheet, lesson planner, rubric and timetable tools for educators.

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For Content Creators

Hashtag generator, caption generator, YouTube title, script timer, word counter, readability checker, image tools and more for influencers and YouTubers.

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For Small Business Owners

Inventory calculator, expense tracker, budget planner, UPI QR, invoice generator, GST calculator, payroll and profit margin tools for shop owners and SMEs.

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For Traders & Investors

SIP, FD, PPF, NPS, capital gains, CAGR, mutual fund, gold rate, inflation and retirement calculators for traders and investors.

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For Event Planners

Budget planner, countdown timer, currency converter, city distance, QR code, invoice, date calculator and image tools for event planners.

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For Travel Agents

Currency converter, world clock, city distance, dial codes, unit converters, age calculator, gold rate and QR generator for travel agents.

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For Lawyers & Legal Professionals

Limitation period calculator, court fee estimator, legal notice generator, NDA, privacy policy, GSTIN/PAN validator and financial tools for Indian lawyers.

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For Civil & Electrical Engineers

Ohm's Law, electrical load and MCB sizing, concrete mix design, beam deflection, wire gauge, unit converters and financial tools for civil and electrical engineers.

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Student Tools FAQ

To convert CGPA to percentage, multiply by your university's factor - CBSE uses ×9.5, Anna University ×10, VTU ×10. Our CGPA to Percentage calculator supports CBSE, Anna University, VTU and a custom formula.

Most Indian universities require a minimum of 75% attendance. Our Attendance Calculator tells you how many classes you can skip while staying above 75%, or how many extra classes you need to recover your percentage.

The Pomodoro technique uses 25-minute focused study sessions separated by 5-minute breaks, with a longer break after every 4 sessions. Use our Pomodoro Timer to track sessions automatically and improve focus.