📊
Percentage Calculator
Find marks percentage instantly.
Your result will appear here.
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Student Tools
Everything you need for quick everyday calculations.
📝
Marks Calculator
Add multiple subjects and see your total.
Enter your marks.
🎓
GPA Calculator
Calculate a simple GPA from grade points.
Enter your grade points.
🎂
Age Calculator
Find your exact age from your birth date.
Choose your birth date.
📐
Unit Converter
Convert common length, weight and temperature units.
Enter a value.
⏱️
Study Timer
A distraction-free 25-minute study session.
25:00
🧮
Basic Calculator
Quick calculations for homework and daily use.
Enter a calculation.
🎯
Target Marks Calculator
See how many marks are needed to reach a target percentage.
Enter your target.
Why Gakuno?
Made to be useful, not complicated.
⚡ Fast
Everything needed for the basic calculations runs directly in your browser. No app or account is required.
🔒 Privacy-minded
The current calculators process their inputs locally in your browser. Gakuno does not require you to create an account.
📱 Mobile friendly
Use Gakuno comfortably on phones, tablets, laptops and desktop computers.
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About Gakuno
Simple tools for everyday school and study needs.
What is Gakuno?
Gakuno is a free, student-focused website created to make common school and study calculations quicker and easier. Instead of searching for a different calculator every time, students can find several useful tools together in one simple place.
Whether you are checking your percentage after an exam, calculating an average, working out a GPA, converting units, checking your age, setting a study timer or figuring out the marks needed for a target percentage, Gakuno is designed to keep the process straightforward.
The goal is not to replace learning. The tools are meant to help students understand and handle small calculations so they can spend more time focusing on their actual studies.
Built for students
Gakuno keeps the interface clean and focused so that a student can open a tool, enter the required information and get an answer without unnecessary steps.
The website is lightweight and works directly in a modern web browser, making it useful whether you are studying at home, preparing for an exam or working on homework.
Gakuno is currently a simple browser-based project and will continue to evolve with useful student-focused features.
About the Creator
The student behind Gakuno.
Avyaan Sahu
Student · Builder · Technology enthusiast
Avyaan Sahu is a student with an interest in coding, artificial intelligence, technology and building useful projects.
He created Gakuno with a simple idea: useful student tools should be easy to find, easy to understand and accessible in one place. What started as a practical project is intended to grow into a helpful collection of tools for students and learners.
Gakuno reflects his interest in using technology not just to experiment, but to create things that can be genuinely useful in everyday life.
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Student Guides
Understand the ideas behind the calculators.
These short explanations are designed to help students understand what each tool calculates, how the basic formula works and where the result can be useful.
📊 Percentage Calculator
What is a percentage?
A percentage expresses a number as a part of 100. It is commonly used in schools to describe exam marks, attendance, discounts, statistics and many other quantities.
Percentage formula
Percentage = (Marks Obtained ÷ Total Marks) × 100
Simple example
If you score 72 marks out of 80, the percentage is (72 ÷ 80) × 100 = 90%.
Common uses
Students can use percentages to check examination results, compare scores and understand how marks translate into a percentage.
📝 Marks Calculator
What does it calculate?
The Marks Calculator adds marks from the subjects you enter and gives the total, number of subjects entered and average marks.
Formula
Average = Total Marks ÷ Number of Subjects
Simple example
If five subjects have scores of 70, 75, 80, 65 and 90, the total is 380 and the average is 76.
Common uses
It can help students quickly review their performance across several subjects before calculating percentages or reviewing their study progress.
🎓 GPA Calculator
What is GPA?
GPA, or Grade Point Average, is a way of summarising academic performance using grade points. Different schools, colleges and boards may use different grading systems.
Basic formula
Average GPA = Sum of Grade Points ÷ Number of Grade Points
Simple example
If four subjects have grade points of 8, 9, 7 and 10, the simple average is (8 + 9 + 7 + 10) ÷ 4 = 8.50.
Important note
This calculator provides a simple average. If your institution uses credit-weighted GPA or a specific conversion system, follow the official rules of your institution.
🎂 Age Calculator
What does it do?
The Age Calculator determines your age in years, months and days from your date of birth and the current date.
How it works
It compares the birth date with today's date and accounts for whether the current month and day have already passed.
Example
If a person's birthday was several years ago, the calculator can show the completed years together with the additional months and days since their last birthday.
Common uses
It can be useful for checking age for school forms, competitions, applications and personal reference.
📐 Unit Converter
What is unit conversion?
Unit conversion changes a measurement from one unit to another without changing the quantity itself.
Examples
1 metre equals 100 centimetres, while 1 kilogram equals 1000 grams. Temperature conversion uses a different mathematical relationship.
°F = (°C × 9/5) + 32
°C = (°F − 32) × 5/9
Common uses
Unit conversion is especially useful in mathematics, physics, chemistry, geography and everyday measurements.
⏱️ Study Timer
Why use a study timer?
A timer can help divide study time into manageable sessions and make it easier to begin a task without worrying about the entire workload at once.
How Gakuno's timer works
The built-in timer starts with a 25-minute session. You can start, pause or reset the session at any time.
Study tip
Try choosing one specific task before starting the timer. When the session ends, take a short break before deciding whether to continue.
🧮 Basic Calculator
What can it calculate?
The Basic Calculator handles simple arithmetic expressions using numbers, addition, subtraction, multiplication, division, parentheses and percentages.
Examples
(25 × 4) + 10 ÷ 2 = 105
50% of 200 = 100
Study use
It can be useful for checking arithmetic while working through homework, provided students still understand the mathematical method behind the answer.
🎯 Target Marks Calculator
What does it calculate?
The Target Marks Calculator tells you how many marks correspond to a chosen target percentage out of a given total.
Formula
Required Marks = Total Marks × Target Percentage ÷ 100
Example
For a 90% target in a test worth 500 marks: 500 × 90 ÷ 100 = 450 marks.
Planning use
Students can use this result as a simple target while planning revision. It is a goal-setting aid, not a prediction of final results.
Frequently Asked Questions
Quick answers about Gakuno.
Are the tools free?
Yes. The calculators and study tools currently available on Gakuno are designed to be free to use.
Do I need to create an account?
No. The current tools work without registration or an account.
Is my calculator data uploaded?
The calculations in this version are performed in your browser. Gakuno does not need calculator inputs to provide the results. You should still avoid entering sensitive personal information into any future feature unless its privacy information explains how that data is handled.
Can I use these tools for school?
Yes, as quick calculation and study helpers. For official grades, admissions, examinations or school-specific formulas, always follow the rules and calculations provided by your school, institution or examination board.
Is the GPA calculator suitable for every school?
Not necessarily. Gakuno's GPA tool calculates a simple average of the grade points entered. Some institutions use weighted credits or different grading scales, so official calculations should always follow the relevant institution's system.
Does Gakuno currently send contact form messages by email?
No. The contact form is currently a demonstration form and is not connected to an email or backend service.
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Contact Gakuno
Have an idea, suggestion or feedback?
Let's hear from you.
If you have an idea for a useful student tool, found something that could be improved or simply want to share feedback, you can use the form.
The current form is only a front-end demonstration. It does not send or store email messages yet.
Please do not include passwords, financial information or other sensitive personal information in this demo form.
Privacy Policy
How information is handled on Gakuno.
1. Information Collected
Gakuno is designed to work without requiring an account. The current calculator tools do not require registration or submission of personal information.
If you voluntarily use a future feature that requests information, the type of information collected and its purpose should be explained at the point where it is requested.
2. Information Entered into Calculators
The current calculators process their inputs in your web browser. The values entered into the percentage, marks, GPA, age, unit, timer, basic calculator and target marks tools are used to perform the requested calculation.
These tools do not require calculator values to be sent to a Gakuno server to produce their results.
3. How Information Is Used
Information entered into the current client-side tools is used to provide the requested calculation or interaction. Gakuno does not need an account or calculator database for these basic features.
4. Contact Form
The contact form currently included on the website is a demo and is not connected to an email server or backend. Submitting it does not send a message to the creator.
5. Cookies
The current static version of Gakuno does not intentionally require cookies for its calculators to function. If cookies are introduced in the future, this policy should be updated to explain their purpose and the relevant choices available to visitors.
6. Advertising and Google AdSense
Advertising may be introduced on Gakuno in the future. If advertising is enabled, Gakuno may use Google AdSense or another advertising service. At present, the advertisement areas on this page are placeholders and do not contain a Google AdSense publisher ID or ad unit code.
If Google AdSense is enabled, Google and its partners may use cookies or similar technologies in accordance with their own policies. The site's privacy information should be updated when advertising is actually activated.
7. Third-Party Services
The current tools do not depend on a third-party account service for their calculations. If third-party services are added later, such as advertising, analytics, embedded content or external APIs, their involvement should be disclosed appropriately.
8. Analytics
Gakuno does not claim to use an analytics service simply because analytics may be useful for a website. If an analytics platform is actually connected in the future, this policy should be updated to describe what information it collects and why.
9. Student and Children's Privacy
Gakuno is intended to provide general educational tools and does not require students to create accounts. Visitors should avoid submitting sensitive personal information through forms or future features.
If Gakuno introduces features that collect personal information from children or students, those features should be designed and operated in accordance with applicable privacy and child-safety requirements.
10. Data Security
The current client-side calculators reduce the need to transmit calculator inputs to a server. No website can guarantee absolute security, however, and users should avoid entering confidential information into tools that do not need it.
11. Changes to This Privacy Policy
This Privacy Policy may be updated when Gakuno adds new features, services or data practices. The latest version published on this page will apply to future use of the website.
12. Contact Information
For privacy-related questions or concerns about Gakuno, use the Contact section on this website. The current contact form is a demonstration and is not connected to email yet.
Last reviewed: September 2026.
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Terms of Use
Guidelines for using Gakuno.
1. Acceptance of Terms
By using Gakuno, you agree to use the website responsibly and in accordance with these Terms of Use. If you do not agree with these terms, please do not use the website.
2. Proper Use of Gakuno
Gakuno is intended for personal, educational and general informational use. Students may use the tools to check calculations, practise concepts and plan study activities.
3. Calculator and Tool Accuracy Disclaimer
Gakuno's tools are provided as convenient calculation aids. While reasonable care is taken when creating and maintaining them, results should not be treated as official academic, financial, legal, medical or institutional calculations.
Always verify important results against your school's rules, examination board requirements, official documents or another trusted source.
4. Intellectual Property
The Gakuno name, original website design, written content and original code are part of the project created for Gakuno unless otherwise stated. You may use the website and its tools for their intended purposes, but you should not misrepresent the site or its content as your own.
5. Prohibited Misuse
Users should not attempt to damage, disrupt, overload or interfere with the website or use it for unlawful purposes. Automated abuse, malicious code injection and attempts to gain unauthorized access are prohibited.
6. Third-Party Links and Services
Future versions of Gakuno may contain links to third-party websites or services. Gakuno does not control those external services and is not responsible for their content, availability, privacy practices or terms.
7. Limitation of Liability
Gakuno is provided on an as-is and as-available basis. To the extent permitted by applicable law, Gakuno and its creator are not responsible for losses or damages resulting from reliance on calculator results, website availability or information provided through the site.
8. Changes to These Terms
These Terms of Use may be updated as Gakuno develops. Continued use of the website after changes are published indicates acceptance of the updated terms to the extent permitted by applicable law.
9. Contact Information
Questions about these Terms of Use can be directed through the Contact section of Gakuno. The current contact form is a demo and is not connected to email yet.
Last reviewed: September 2026.
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