Calvo — Free Online Scientific Calculator, Unit Converter & AI Math Solver

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About Calvo
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Calvo
Scientific Calculator & Formulas

Calvo is a full-featured scientific calculator built for students from 9th class through MS level. It brings together a real calculator engine, a searchable formula library across seven subjects, a unit converter, and a percentage / GPA-CGPA calculator — all in one place.

Built with care to make studying and quick calculations faster, our goal is to be the one tool you keep open in a browser tab all semester.

Who made Calvo

Calvo is built and maintained by Hafiz Muhammad Usman, a software developer. It started as a simple idea: students shouldn't have to juggle a physical calculator, a separate unit converter app, and a printed formula booklet just to get through their homework.

As a developer, I wanted to put together one tool that actually covers what students from 9th class through university need — a real scientific calculator, a searchable formula library, an AI solver for step-by-step help, and the everyday tools that come up constantly during exam season.

Calvo is actively maintained and updated based on feedback from students who use it. If something's missing or broken, reach out directly at usmaniftikhar2803@gmail.com — every message is read.

Questions or suggestions? Reach us at usmaniftikhar2803@gmail.com

How to Use — Button Guide

Privacy Policy

Terms & Conditions

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Calvo
Scientific Calculator
SC-991
Dual Power
DEG SHIFT ALPHA HYP M
READY
 
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Calvo Scientific • • • SC-991

Formula Library

9th Class to MS Level — All Subjects

Calculation History

Every equal-sign result, saved automatically

Unit Converter

Length, weight, temperature & more

 

Percentage & GPA / CGPA

Quick percent math, and a full CGPA calculator

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Saved Results

AI Math Solver

Type a question or upload a photo — powered by Google Gemini (free)

Saved Questions

Formula Quiz
Test yourself on formulas from any subject
Function Grapher
Plot functions or explore the unit circle
to
Equation Solver
Step-by-step linear & quadratic solutions — works fully offline
Matrix Calculator
Addition, multiplication, determinant, inverse & more (2×2 to 4×4)
Programmer Mode
Base conversions & bitwise operations
BIN
OCT
HEX

Bit Width

Bitwise Operations

Bit Manipulation

More Tools

Statistics
Mean, median, mode, variance, quartiles & more from your data
Subject Tools
Chemistry, Physics, Biology & Commerce calculators built for your syllabus
Study Timer
Exam countdown or Pomodoro focus sessions — with break reminders
25:00
Focus
Crop / Rotate Photo
Choose Theme
Text Size

Changes reading text in Formulas, Quiz, AI Solver & more (not the calculator keys).

Frequently Asked Questions

Is Calvo free to use?

Yes, Calvo is completely free. There's no sign-up, no subscription, and no hidden charges — you can use the scientific calculator, formula library, unit converter and every other tool right away.

Does Calvo work offline?

Yes. Calvo is a Progressive Web App (PWA), so once you've visited it once, most features keep working even without an internet connection.

Is Calvo available as an Android app?

Yes, Calvo is available on the Google Play Store as an Android app, alongside this website which you can also add to your home screen directly from your browser.

What subjects and tools does Calvo support?

Calvo covers a scientific calculator, graphing, programmer and statistics modes, a formula library with 2950+ formulas across math, physics, chemistry, biology, statistics, commerce and computer science, a GPA/CGPA calculator, unit converter, AI math solver, and subject-specific tools for Chemistry, Physics, Biology and Commerce.

Do I need to create an account to use Calvo?

No sign-up is required. Just open the website or app and start calculating right away.

Does Calvo store or share my calculations?

Your calculations stay on your own device. Calvo doesn't require an account and doesn't collect your calculation history on its servers. See our Privacy Policy for full details.