Calculate anything, instantly.
A small set of calculators that update as you type — no page reloads, no digging through a wall of links to find the one you need.
A calculator for everything you need to work out
Numbers show up everywhere — in your monthly budget, your report card, your gym routine, even game night. Mathify.net brings every calculator you're likely to need onto one fast page, so you never have to hunt through five different sites just to work out a simple sum. Whether you're after a quick calculator to settle an argument or a more specialized tool for a financial decision, this calculator hub is built to answer instantly, without a "Calculate" button, a page reload, or a pop-up in sight.
Finance calculators that do the heavy lifting
House-hunting? Our Mortgage Calculator breaks down your estimated monthly payment, total interest, and total cost over the life of the loan, so you can compare offers with confidence. Financing a car or a personal purchase instead? The Loan Calculator handles any fixed-rate loan the same way, showing your monthly payment and the total interest you'll pay over time.
Saving instead of borrowing? The Compound Interest Calculator shows how a lump sum — plus optional monthly contributions — grows over the years, while the Simple Interest Calculator is there for flat, non-compounding interest on a straightforward principal. And if you deal with pricing across borders or need to separate tax from a total, the VAT Calculator adds or removes VAT from any price, showing the net price, the VAT amount, and the gross total side by side.
Health calculators for everyday tracking
Staying on top of your health shouldn't require a spreadsheet. The BMI Calculator gives you your body mass index and where it falls on the healthy-range scale, in both metric and imperial units. Pair it with the Calorie Calculator, which estimates your daily energy needs — basal rate, maintenance level, and a target for losing, maintaining, or gaining weight — based on your age, height, weight, and activity level.
School and math calculators built for students
Students get a full toolkit here too. The Grade Calculator works out a weighted average across every assignment you add, complete with a live letter grade. The GPA Calculator does the same on a standard 4.0 scale, weighting each course by its credit hours. For everyday math, the Percentage Calculator covers all three common percentage questions — finding a percent of a number, working out what percent one number is of another, and calculating percent change — while the Fraction Calculator adds, subtracts, multiplies, or divides two fractions and simplifies the result automatically. Need something with more horsepower? The Scientific Calculator adds trigonometric functions, logarithms, square roots, and exponents to the same live-typing keypad as our standard calculator.
Date, time, and a bit of fun
Planning around a schedule? Our date and time calculator tools cover both halves of the job: the Date Calculator finds the number of days between two dates or adds and subtracts days from a date, while the Time Calculator adds or subtracts durations and finds the elapsed time between two clock times. The Age Calculator turns a birth date into an exact age in years, months, and days, plus a countdown to the next birthday. And when the math is done and it's time to unwind, the Dice Roller rolls any number of dice in any size and keeps a running log of your last few throws.
Why use an online calculator instead of doing it by hand
A good calculator website should feel faster than opening a spreadsheet or digging out a physical calculator — and that's the whole idea behind Mathify.net. Every tool updates its result the moment you type, so you spend less time calculating and more time using the answer. No sign-up, no downloads — just a calculator for whatever you need to work out, right when you need it.
Frequently asked questions
Common questions about how Mathify.net's calculators work.
Yes. Every calculator on this site is completely free, with no sign-up, no account, and no paywall. Just enter your numbers and get an instant result.
No. Every tool on Mathify.net updates its result live as you type or adjust a field, so there's nothing to submit and no page reload to wait for.
No. All calculations run directly in your browser. Nothing you type — financial figures, health details, grades, or dates — is sent to a server or saved anywhere.
Each calculator uses standard, well-established formulas — for example, amortization formulas for mortgage and loan payments, the Mifflin-St Jeor equation for calorie needs, and standard 4.0-scale weighting for GPA. Results are reliable estimates, though tools like the calorie or mortgage calculator are meant as planning guides rather than a substitute for advice from a doctor, lender, or financial advisor.
Yes. Every calculator is fully responsive and works on phones, tablets, and desktop browsers alike — there's nothing to install.
Mathify.net covers finance (mortgage, loan, compound interest, simple interest, VAT), health (BMI, calories), school (grade, GPA), everyday math (percentage, fraction, scientific), and utilities (age, date, time, and a dice roller) — all on one page, searchable from the tool grid at the top.
Yes. Use the toggle in the top-right corner of the page to switch between light and dark themes at any time.
Grade calculator
Add each graded item with its score and weight — your running grade updates on every keystroke.
Assignments
GPA calculator
Add your courses with credit hours and letter grade for a credit-weighted GPA.
Courses
Calorie calculator
Estimate your daily energy needs based on your stats and activity level.
Your details
Dice roller
Roll any number of dice, in any size, and keep a running log of your last few throws.
Setup
BMI calculator
Enter your height and weight to see your body mass index and where it falls.
Your measurements
Mortgage calculator
Estimate your monthly mortgage payment and total interest over the life of the loan.
Loan details
Loan calculator
Work out the monthly payment for any fixed-rate loan — auto, personal, or otherwise.
Loan details
Compound interest calculator
See how a principal grows with compounding, plus optional regular contributions.
Investment details
Simple interest calculator
Interest calculated only on the original principal — no compounding.
Details
VAT calculator
Add VAT to a net price, or pull it back out of a price that already includes it.
Details
Percentage calculator
Find a percentage of a number, what percent one number is of another, or the percent change between two values.
Mode
Age calculator
Enter a birth date to get an exact age and a countdown to the next birthday.
Birth date
Date calculator
Find the number of days between two dates, or add/subtract days from a date.
Mode
Time calculator
Add or subtract two durations, or find the elapsed time between two clock times.
Mode
Duration A
Duration B
Fraction calculator
Add, subtract, multiply or divide two fractions and get a simplified answer.
Fractions
Scientific calculator
Trig, logs, powers and roots, with the same live keypad feel as the standard calculator.
About Mathify.net
A free hub of instant calculators for finance, health, school, and everyday math.
What we built
Mathify.net brings sixteen calculators together on a single, fast site — covering finance (mortgage, loan, compound interest, simple interest, VAT), health (BMI, calories), school (grade, GPA), everyday math (percentage, fraction, scientific), and a handful of everyday utilities (age, date, time, and a dice roller). Every tool updates its result the moment you type, with no page reloads and no forms to submit.
Why we built it
Most calculator sites bury a simple tool under ads, pop-ups, and unrelated content. We wanted the opposite: open the page, find the calculator you need, and get your answer in seconds. That focus on speed and clarity shapes every part of the site, from the live-updating results to the clean, distraction-free layout.
How the calculators work
Each tool runs entirely in your browser using standard, well-established formulas — for example, amortization formulas for mortgage and loan payments, the Mifflin-St Jeor equation for calorie needs, and standard weighting for grades and GPA. Nothing you type is sent to a server, which means your numbers stay private and your results appear instantly.
Our approach
- Free, always. Every calculator is free to use, with no account and no paywall.
- No sign-up. Open a tool and start typing — nothing to register.
- Private by design. Calculations happen in your browser, not on our servers.
- Built for speed. Live results, no reloads, no unnecessary steps.
Have a suggestion for a calculator we should add, or feedback on an existing tool? We'd love to hear from you on our Contact page.
Privacy Policy
What information Mathify.net collects, how it's used, and the choices you have.
Last updated: July 2026
Calculator inputs stay in your browser
Every calculator on Mathify.net — including the mortgage, loan, BMI, calorie, grade, GPA, and other tools — runs entirely client-side, in your browser. The numbers, dates, and other details you enter are used only to compute the result shown on your screen. They are not transmitted to our servers, stored in a database, or shared with any third party.
Information we may collect
Like most websites, our hosting and analytics providers may automatically log basic technical information, such as your approximate location, browser type, device type, and the pages you visit, in aggregate form. This is used only to understand overall site traffic and improve performance — it is never combined with the specific figures you type into a calculator.
Cookies
We may use minimal, privacy-friendly cookies or local storage to remember simple preferences, such as your light or dark theme choice. These do not identify you personally on their own.
Advertising
Mathify.net displays advertising served by Google AdSense. Google and its advertising partners may use cookies — including the DoubleClick cookie — to serve ads based on your prior visits to this and other websites. This may include personalized advertising based on your browsing activity.
You can opt out of personalized advertising by visiting Google's Ads Settings, or opt out of third-party vendor use of cookies for personalized ads by visiting aboutads.info. For more on how Google uses information from sites that use its services, see Google's Partner Sites policy.
Third-party links
Some pages may link to external resources for further reading. We aren't responsible for the privacy practices of those third-party sites, and we encourage you to review their own policies before sharing information with them.
Children's privacy
Mathify.net is a general-audience tool and does not knowingly collect personal information from children. Since the site does not require sign-up or personal details to function, no such information is requested from any user.
Changes to this policy
We may update this policy from time to time to reflect changes to the site or applicable law. Any changes will be posted on this page with an updated revision date.
Contact us
If you have questions about this privacy policy, please reach out via our Contact page.
Terms & Conditions
Please read these terms carefully before using Mathify.net.
Last updated: January 2026
Acceptance of terms
By accessing or using Mathify.net, you agree to be bound by these Terms & Conditions. If you do not agree with any part of these terms, please do not use the site.
Use of the site
Mathify.net provides free, general-purpose calculators for informational and educational purposes. You may use the site for personal or professional reference. You agree not to misuse the site, attempt to disrupt its operation, or use it in any way that violates applicable law.
Not professional advice
The calculators on this site — including but not limited to the mortgage, loan, compound interest, simple interest, VAT, BMI, and calorie calculators — are provided for general informational purposes only. They do not constitute financial, medical, tax, legal, or academic advice. Always consult a qualified professional, such as a lender, doctor, accountant, or academic advisor, before making decisions based on any result shown here.
Accuracy of results
We aim for every calculator to use accurate, standard formulas, but results are estimates and may not reflect your exact real-world figures, fees, or circumstances. Mathify.net makes no warranty, express or implied, as to the accuracy, completeness, or reliability of any result.
Intellectual property
The design, layout, code, and content of Mathify.net are the property of Mathify.net unless otherwise noted. You may not copy, reproduce, or redistribute substantial portions of the site without permission.
Limitation of liability
To the fullest extent permitted by law, Mathify.net and its operators shall not be liable for any direct, indirect, incidental, or consequential damages arising from your use of, or inability to use, this site or reliance on any calculator result.
Changes to these terms
We may revise these terms at any time. Continued use of the site after changes are posted constitutes acceptance of the updated terms.
Contact us
Questions about these terms can be sent to us via our Contact page.
Contact Us
Have a question, spotted an issue, or want to suggest a new calculator? We'd love to hear from you.
What to include
To help us respond quickly, please let us know:
- Which calculator you're writing about, if any
- A short description of the question, issue, or suggestion
- The device or browser you were using, if you're reporting a bug
Response time
We read every message and aim to respond within a few business days. Mathify.net is a small, independently run project, so thank you for your patience.
Looking for something else?
For questions about how we handle information, see our Privacy Policy. For questions about using the site, see our Terms & Conditions.