1282 free tools
Free Online Calculators
Money, math, health, science and everyday life. Instant answers, formulas explained in plain words, no sign-up.
Calculator of the day
All categories
Popular tools
Mortgage spreads a loan into equal monthly payments using the standard amortization formula.
Loan EMI spreads a loan into equal monthly payments using the standard amortization formula.
Compound Interest applies the time value of money: a dollar today can grow, so future amounts are worth less in today's terms.
Why people trust CalcBeam
Free, forever
No accounts, no paywalls, no limits. Every tool is free for personal and professional use.
Private by design
Math runs on your device in JavaScript. Your inputs are never uploaded, stored or sold.
Transparent math
Each page shows the exact formula, a worked example and its assumptions, so you can check the answer.
Reviewed and tested
The formula library is unit-tested automatically and every page carries a last-reviewed date.
About CalcBeam calculators
CalcBeam is a free library of 1282 online calculators across 20 categories: finance, health, math, science, business, construction, conversion, education and more. Every calculator runs entirely in your browser: no sign-up, no paywall, and no data leaves your device.
What makes these calculators different is transparency. Each tool shows the exact formula it uses and a step-by-step breakdown of how your inputs become the result, so you can verify the math instead of trusting a black box. Result interpretation, common mistakes, assumptions and limitations are documented on every calculator page, alongside worked examples and an FAQ. Health and finance tools cite the standard formulas they follow and state plainly where a calculator's answer should be confirmed with a professional.
The guides library goes deeper on the calculations people search for most: percentage and discount math, loan EMI and amortization, income-tax brackets, calorie and macro planning, concrete volumes and more. The glossary defines the terminology in plain language. Popular starting points: MortgageLoan EMIPercentageBMICompound Interest, or browse a category above to find the tool you need.
Not sure which tool fits?
Comparison hubs line up similar calculators side by side so you pick the right one in seconds.
Latest from the blog
All postsLearn exactly how your loan EMI really works: the amortization formula, why early payments are mostly interest, and how extra paym
The rule of 72 turns any interest rate into years-until-doubling. Learn the math, see worked investing examples, and use it agains
Think 20% + 10% off equals 30% off? It is really 28%. Learn why stacked discounts multiply instead of adding, with real store exam
BMI is a useful screening tool with real blind spots. Learn what body mass index gets right, where it misleads, and the two simple
A $60,000 salary is not really $28.85 an hour. Convert salary to hourly the honest way: PTO, holidays, taxes, benefits, hidden per
APR is what borrowing costs; APY is what savings earn. Learn the compounding math behind both, with credit card and mortgage examp
Frequently asked questions
Are all CalcBeam calculators free?
Yes. Every calculator is free with no sign-up, no paywall and no usage limits. The site is supported by simple display ads only.
Do I need to create an account or install anything?
No. Every calculator runs instantly in your browser. Your history and favorites are stored only on your own device, never on our servers.
How accurate are the results?
Each page shows the exact formula it uses, a worked example and its assumptions, so you can verify the math yourself instead of trusting a black box.
Can I use these calculators offline?
Yes. CalcBeam is installable as an app: after your first visit the core calculators keep working without an internet connection.
How do I find the right calculator?
Use the search box at the top for live suggestions, browse the 20 category cards below, or open a comparison hub that lines up similar tools side by side.
What is the Calculator of the Day?
Every day we highlight one useful calculator on the homepage. It rotates automatically, so check back to discover tools you did not know existed.
Can I save my favorite calculators?
Yes. Tap the Favorite button on any calculator page and find it later under Favorites in the menu. Everything is stored locally in your browser.
Does CalcBeam keep a history of my calculations?
Yes, on your device only. The History page lists your recent calculations so you can revisit them. Clear it anytime from Settings.
Can I compare two results side by side?
Yes. Use Save to compare on any calculator page, then open the Compare page to line up to three saved results with their inputs.
What is the function grapher?
The Graph page plots any y = f(x) expression instantly on an interactive chart you can zoom and pan. Great for checking homework or exploring curves.
What is the Geometry Lab?
An interactive playground where you drag points and watch side lengths, angles, area and perimeter update live. Try it with the triangle and circle modes.
Can I embed a CalcBeam calculator on my own website?
Yes. The Embed page builds a copy-paste iframe snippet for any calculator, with size and theme options. Free for personal and educational sites.
How can I share a calculation with someone?
Use Copy share link on any calculator page. It creates a URL with your exact inputs prefilled, so the other person sees the same result.
Does CalcBeam have a dark mode?
Yes, plus a high-contrast accessibility mode. Toggle them from the header; your choice is remembered on your device.
Are the finance tools financial advice?
No. They are educational calculators. Read the finance disclaimer and talk to a licensed professional before big money decisions.
How do I report a wrong result?
Use the contact page and include the page URL, your inputs and what you expected. Calculation corrections are our top priority.