Free Online Calculator - Percentages, Bills, Budgets and More
A calculator that does more than basic arithmetic. Work out a 15% tip on a $67 bill, check whether a “20% off” sale price is actually cheaper than a competitor, or split a $340 dinner four ways with one person owing extra for drinks. Type it in, get the answer, no sign-up.
Use the Calculator
Tap the buttons or use your keyboard — number keys, +, -, *, / and Enter all work. Use “Rad/Deg” to switch modes before running trig functions. Your last result is stored in “Ans” so you can chain calculations without retyping numbers.
What you can calculate:
- Addition, subtraction, multiplication and division
- Percentages, including discounts, tips and GST
- Decimal calculations
- Scientific functions, sin, cos, tan, log, exponents and more
Read our guides on how to use each calculation type in everyday life: see the blog
Bills & Expenses
Split a dinner bill, calculate your monthly rent as a percentage of income, or check whether a direct debit matches what you agreed to. Our calculator gives you the number in seconds. No guessing, no rounding errors.
Shopping
Work out the real price after a discount, compare unit prices between pack sizes, or calculate how much GST is included in a total. Know exactly what you are paying before you reach the counter.
Students
Check homework answers, calculate a test score as a percentage, or verify a formula result step by step. Works on any phone without an app. Useful from primary school through to university.
Office Work
Calculate profit margins, check invoice totals, work out percentage changes between figures, or split costs across departments. Fast enough to use mid-meeting without switching to a different tab.
Why All Calculator
Built for speed
The calculator loads in under 1 second and works on the slowest mobile connection. No waiting, no buffering. Results appear the moment you press equals.
No clutter
No pop-ups asking you to sign up. No banners interrupting your calculation. Just the tool you came for, working exactly as expected, every time.
Backed by real guides
Every calculation type has a plain-English guide in our blog so you understand the maths behind the answer, not just the number. Whether you are calculating a discount or working out a monthly budget, the guide is right there.
From the Blog
How to Calculate Percentage
Learn the formula behind test scores, discounts and everyday maths. With worked examples.
Read more →How to Split a Bill With Friends
The fast way to divide a restaurant bill, calculate tip, and handle uneven orders.
Read more →5 Everyday Situations Where a Calculator Saves You Money
From discounts to payslips - where accurate maths makes a real financial difference.
Read more →Frequently Asked Questions
Q1. What types of calculators are available on this website?
We offer a full-featured calculator on this page covering everyday arithmetic, percentages, brackets, exponents, and trigonometric functions — all in one tool so you don't need to hunt for a separate calculator for each task.
Q2. Are these calculators free to use?
Yes, completely free. No subscription, no trial period, no hidden fees. Every feature is available to every visitor from the first use, with no account required.
Q3. Do I need to download any app to use these calculators?
No download or installation of any kind is needed. Open the website in any browser - Chrome, Safari, Firefox, Edge, and the calculator is ready immediately. It works as a web app directly in your browser.
Q4. Can I use these calculators on my mobile phone?
Yes, the calculator is fully responsive and tested on iOS and Android. Buttons are sized for touchscreens and the layout adjusts automatically to any screen size. It works just as well on a phone as on a desktop.
Q5. How accurate are the calculations?
The calculator uses standard mathematical order of operations and is accurate to the precision your browser supports, typically 15 significant figures. Results are displayed clearly and can be carried forward into your next calculation using the Ans button.
Q6. Can I use these calculators for school or homework?
Yes, students from primary school through university use All Calculator for homework, checking answers, and exploring mathematical concepts. The scientific functions including sin, cos, log, and exponents support more advanced coursework as well.
Q7. Do I need an internet connection to use the calculators?
Yes, an internet connection is required to load the page. Once loaded, the calculator runs entirely in your browser, no further data is sent to our servers during your calculations.