Free Scientific Calculator Online
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Free Calc Solver & Scientific Calculator Online

shtools is a free calc solver with trig, logarithms, algebra, fractions, and more. No download needed, just open and start solving.

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About shtools

shtools is a free browser-based scientific calculator built for everyday math. It handles basic arithmetic all the way up to algebra, trig, and logarithms. No download, no account. Just open the page and start calculating.

Math Topics

Algebra Formulas Algebraic Expressions Polynomials Explained Fractions to Decimals Factoring Polynomials Equivalent Fractions

How to Use the Calculator

Click numbers and operators to build your expression. Hit = to get the answer. AC clears everything. ⌫ deletes the last character. For trig and log functions, type the number first then click the function - so type 45 then hit sin to get sin(45°) = 0.7071. That's all there is to it.

What It Actually Does

I wanted a calculator that didn't require an app download or a login. Just open it and go. shtools handles the things you actually need - basic arithmetic, trig, logs, square roots, powers, percentages, and parentheses for controlling order of operations. The constants π and e are one click away. It works the same on a phone, a Chromebook, or a desktop.

I've used it to double-check sin values during a physics problem at 11pm when I didn't have my TI-84 nearby. It worked fine. That's the whole point - reliability when you need it, zero friction to get there.

The Six Themes

There are six calculator skins: Classic dark, iOS style, Android minimal, light minimal, pastel candy, and teal flat. I added them because different people genuinely have preferences and staring at a calculator for an hour during homework matters. The pastel one is personally my favourite. Switch them using the buttons above the calculator - it's instant, no reload.

Who Uses This

Mostly students - high school and university. A lot of people use it on Chromebooks at school because they can't install apps. Teachers use it to demonstrate live in class without pulling out a physical calculator. I've also seen it used for quick percentage checks while shopping, salary calculations, and tipping at restaurants. Basically anyone who needs a calculator right now and doesn't want to dig through their phone's app drawer.

The math tools section below handles the more specialised stuff - fraction arithmetic, unit conversions, equation solving, graphing. If you came here for any of those, scroll down or click directly from the tools grid.

Math Tools

More than 10 math tools
Fraction Calculator Add, subtract, multiply & divide fractions visually Percentage Calculator Find percentages with an animated ring Unit Converter Convert length, weight, temperature & more Geometry Calculator Area & perimeter for any shape with live SVG Graphing Calculator Plot linear equations on a coordinate grid Prime Number Checker Check if a number is prime, see all factors GCF & LCM Calculator Find GCF and LCM with a Venn diagram Ratio Calculator Solve proportions with a balance scale Statistics Calculator Mean, median, mode with a live bar chart Exponent Calculator Visualize powers with an animated grid Roman Numeral Converter Convert numbers to Roman numerals Times Table Color-coded multiplication grid up to 15×15 Equation Solver Solve linear equations step by step Triangle Calculator Solve any triangle with live SVG Number Base Converter Convert between binary, octal, decimal & hex

Why I Made This

Honest reason - I was frustrated. Every time I needed a quick scientific calculator online, I either landed on a site that looked like it hadn't been updated since 2009, or something that demanded I install an extension, create an account, or sit through an ad that took over the whole screen. I just wanted to punch in sin(45) and move on with my life.

So I built shtools. The goal was simple: load fast, work on any device, no friction. I specifically wanted it to feel decent on a school Chromebook because that's where a lot of students are stuck. No app stores, no admin permissions. Just a URL and a browser.

The six themes came later, after I noticed I was using the calculator for long stretches during homework sessions. Looking at a harsh black-on-white or glaring-white-on-black layout for an hour gets tiring. The pastel theme was the first one I actually liked using for extended periods - it's soft enough that it doesn't strain your eyes but still clearly readable. I left all six in because people genuinely have preferences.

The math tools section grew out of the same idea. Fraction arithmetic, GCF/LCM, triangle solving - these are things students look up constantly and usually end up on a mediocre tool surrounded by clutter. I tried to make each one actually explain what it's doing, not just spit out a number.

Browse by Topic

Basic Algebra
Fractions & Proportions

Frequently Asked Questions

What is a calc solver?
A calc solver is an online calculator that handles the kind of math problems you'd normally need a scientific calculator for - things like trig, logarithms, square roots, fractions, and algebra. The reason I called this one a "calc solver" rather than just "calculator" is that it actually works through the expression for you, not just the final number. You can see the full expression as you build it, which helps catch mistakes before you hit equals.
Is shtools free to use?
Completely free. No account, no download, no subscription, nothing hidden behind a paywall. I've kept it that way on purpose. The ads on the page cover costs, which is honestly fine - a small banner beats a $4.99/month subscription to use a calculator.
Can I use shtools at school?
Yes, and this was one of the main things I designed for. School Chromebooks don't let you install apps, and a lot of school WiFi filters block stuff randomly. shtools is just a web page - no installs, no plugins, no nonsense. I've had teachers tell me they use it to demonstrate calculations live in class because it's faster to pull up than digging out a physical calculator. That makes me genuinely happy to hear.
What math functions does shtools support?
The main calculator does trig (sin, cos, tan in degrees), log and ln, square roots, x² and x³, powers, percentages, π and e as constants, and full bracket/parentheses support for controlling order of operations. The math tools section handles the heavier stuff - fraction arithmetic, GCF and LCM, statistics, equation solving, triangle solving, unit conversions, graphing, and more. Most of what you'd need for high school or first-year university math is covered.
Do I need to create an account to use shtools?
No. I deliberately didn't build accounts into this. You open the page, you start calculating. There's nothing to sign up for, nothing to verify. If you close the tab, your last theme preference is saved in your browser. That's the extent of any "persistence." Your calculation history isn't stored anywhere - not on your device, not on any server.
How is this different from a TI-84?
The TI-84 is still the gold standard for exams where you need a physical calculator - shtools isn't trying to replace that. What it does better: it's always open in a browser tab, free, has a larger display so you can actually see what you typed, and the math tools section covers things the TI-84 doesn't visualise (like the Venn diagram for GCF/LCM, or the live SVG for triangle solving). I still own a TI-84 - I just don't always have it with me.
Does shtools work on mobile?
Yes. The layout adjusts for smaller screens and the buttons are sized to be tapable without accidentally hitting the wrong one. I use it on my phone regularly. The one thing I'd say is that the graphing calculator and statistics calculator are more comfortable on a bigger screen - they have charts that need a bit of space to be readable. Everything else works fine at phone size.
What is the difference between log and ln?
log (or log10) is base-10 logarithm. log(100) = 2 because 10² = 100. ln is the natural logarithm, base e (approximately 2.718). ln(e) = 1. In most school math and engineering, "log" means base 10. In higher mathematics and calculus, "log" often means natural log. shtools has both - the log button is base 10, the ln button is natural log. When in doubt about which one your textbook means, check whether they specify the base.
Can shtools solve equations step by step?
The main calculator evaluates expressions but doesn't show algebraic steps. For step-by-step equation solving, use the Equation Solver tool in the math tools section. It handles linear equations and shows each step. I built it specifically because I found that just getting an answer without understanding the steps doesn't really help you learn. It covers what most high school students need.
Is the calculator accurate for trig functions?
Yes. It uses JavaScript's built-in Math functions which are accurate to about 15 significant digits - more than enough for school and most professional use. One thing worth knowing: the calculator takes inputs in degrees, not radians. So sin(90) = 1, not sin(90 radians). If you're working in radians, convert first by multiplying degrees by π/180.
Does shtools save my calculations?
Not in any persistent way. The calculator shows your current expression on screen while you're using it, but it doesn't log your history anywhere. If you close the tab, that's gone. I made this intentional - I didn't want to store anyone's calculations on a server. Your theme preference is saved locally in your browser. That's it.
Why are there games on a calculator website?
Fair question. The game vault is a feature I added for students who use the site during free periods or breaks. It's toggled by the Code Mode switch at the top of the calculator. The idea is that instead of jumping to a different site, you can play something here and come back to your math without losing your work. It's completely optional - if you don't want it, you never have to turn it on.