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Free Online Calculators for Finance, Health, and Everyday Use

Solmint provides a comprehensive suite of free calculators and tools for math, finance, health, and daily tasks. From scientific calculations to loan planning and fitness tracking, find the perfect tool for your needs.

How to Use Solmint Calculators

Solmint calculators share a consistent set of controls so you can move between tools without relearning the interface. Here is what each control does and how to get the most out of it.

All Tools

Browse every calculator by category. Pin a preferred tool so it opens on the homepage each time you visit, and mark tools as favorites for quick access from the favorites list. Your pins and favorites are saved on your device.

Settings

Change site-wide preferences: light or dark mode, numeral system, preferred currency, and page zoom. These apply across all calculators. The Scientific Calculator is the only exception: its two panels each keep their own numeral system so you can use different numeral systems side by side.

Help

Turn help mode on to see explanations and guidance for the calculator you are currently using. The tips are tailored to each tool, so you always get relevant information for the controls in front of you.

History

Toggle the history panel on or off to show or hide your past calculations. Click any entry to reload its values, add notes, or clear the list. History is saved on your device and is optional.

Calculator Options

These are controls specific to the calculator you have open. Depending on the tool, you may see calculation modes, angle units, function categories, display formats, or other tool-specific settings. The available options change from one calculator to another, so explore them when you switch tools.

Why Choose Solmint?

Solmint is built on a simple principle: powerful calculators should be free, private, and accessible to everyone. There are no accounts to create, no subscriptions to buy, and no apps to download. Every tool runs entirely in your browser on any device — phone, tablet, or desktop — with no installation required. You can use every calculator anonymously, and your data never leaves your device.

Privacy is at the core of everything we build. All calculations happen locally in your browser. Your calculation history, saved scenarios, and personal preferences are stored in your browser's local storage and are never uploaded to any server or shared with third parties. There are no tracking cookies, no analytics scripts watching what you do, and no advertising networks profiling your activity. What you calculate stays on your device.

Beyond privacy, Solmint stands out for its inclusivity. The scientific calculator supports approximately 28 native numeral systems — including Hindi (Devanagari), Arabic, Bengali, Tamil, Telugu, Persian, Thai, Burmese, Khmer, and many more — so users around the world can work with numbers in the numeral script they are most comfortable with. In dual mode, you can even enter a value in one numeral system and see it instantly converted to another, making Solmint a practical tool for cross-script numeral conversion as well as everyday calculation.

What You Can Do on Solmint

Solmint brings together over 25 free calculators and practical tools in one place, organized into four categories so you can find what you need quickly. Here is a summary of what each category covers:

Scientific & Math Calculators

The scientific calculator is the centerpiece of this category, offering five modes: Basic for arithmetic, Advanced for trigonometry and logarithms, Calculus for derivatives and integrals, Complex for imaginary numbers, and Statistics for regression and distribution analysis. Alongside it, you will find dedicated calculators for percentages, fractions, geometry (2D and 3D shapes), graphing (plot up to 6 functions simultaneously), matrix operations (up to 10x10), and an equation solver that handles linear, quadratic, cubic, and polynomial equations with step-by-step solutions.

Financial Calculators

Plan your finances with confidence using six specialized tools. The Loan Calculator computes monthly payments, total interest, and amortization schedules with support for extra payments and different frequencies. The Mortgage Calculator adds property taxes, insurance, and HOA fees for a realistic monthly payment. The Currency Converter handles 49 world currencies with live exchange rates and a built-in markup calculator. The Price Comparison tool finds the best unit price across different package sizes. The GST Calculator handles CGST, SGST, and IGST with multi-item support. The Split Bill Calculator divides expenses fairly with equal, percentage, or itemized splits and a settlement tracker.

Fitness & Health Calculators

Understand your body and plan your wellness journey with three science-based tools. The BMI Calculator classifies your weight category using standard health organization ranges. The Calorie Calculator uses the Mifflin-St Jeor equation to estimate your BMR and TDEE, then provides personalized macro recommendations for your activity level. The Weight Goal Calculator creates realistic timelines for weight loss or gain based on your target weight and daily calorie deficit or surplus.

Practical Everyday Tools

Handle everyday calculations with seven practical tools. The Date Calculator counts days between dates, adds or subtracts days, and tracks business days with customizable weekends. The Age Calculator shows exact age in years, months, days, hours, minutes, and seconds with a live counter. The Stopwatch and Timer offers millisecond precision with lap tracking. The World Time Zones tool compares times across 400+ IANA zones with a meeting planner. The Unit Converter handles length, weight, volume, temperature, area, speed, and more. The Distance Calculator measures distances on an interactive map with multi-stop routing. The Leave Calculator plans time off by counting working days with holiday presets for multiple countries.

Frequently Asked Questions

Is Solmint free to use?

Yes. Every calculator and tool on Solmint is completely free with no account, sign-in, subscription, or app download. All tools run directly in your browser on any device.

What types of calculators does Solmint offer?

Solmint offers a scientific calculator with calculus, complex numbers, and statistics modes, plus specialized calculators for loans, mortgages, currency conversion, GST, split bills, percentages, fractions, geometry, matrices, graphing, equation solving, and more. There are also practical tools like a date calculator, age calculator, stopwatch, world time zone planner, unit converter, and distance measurer.

Can I run two calculators side by side?

Yes. The scientific calculator supports dual mode, which opens two independent calculator panels on screen at the same time. Each panel has its own expression, history, angle mode, and numeral system. In linked mode, entering a number in one calculator using a selected numeral system automatically displays the corresponding value in the other calculator using a different numeral system — useful for converting between numeral scripts in real time. In unlinked mode, each calculator operates fully independently, so you can work on two different problems or compare two approaches simultaneously.

What numeral systems does Solmint support?

The scientific calculator supports approximately 28 native numeral systems including Hindi (Devanagari), Arabic, Bengali, Tamil, Telugu, Persian, Thai, Burmese, Khmer, and more. You can switch numeral systems from the settings, and all input and output is displayed in the selected script. Calculations remain in standard floating-point arithmetic regardless of the display script, so accuracy is never affected. In dual mode with linked calculators, you can enter a value in one numeral system and see it instantly in another.

Can I download or share my calculation history?

Yes. Every calculation is automatically saved to the history panel with a timestamp. Each calculator in dual mode maintains its own history in the numeral system it was using. You can download the full history as a PDF document and share it with others — useful for homework, lab work, or keeping a record of your calculations.

Do I need an account to use Solmint?

No. Solmint has no accounts, no sign-in, and no registration. All calculations happen locally in your browser. Your history, saved scenarios, and personal data are stored in your browser's local storage and never uploaded to any server or shared with third parties. You can use every tool anonymously.