Instant
No page reloads, no spinners, no waiting. Results appear as you type — usually in under 100 milliseconds.
Free · No signup · Runs in your browser
Every Calculator
You'll Ever Need
Fast, private, and free. Percentage, age, BMI, tips, discounts, dates, units and more — every tool is one page, one purpose, and instant.
8 calculators
0 signups
<100ms load
Pick a Calculator
Each calculator does one thing and does it well. Open it, enter your numbers, get the answer — with the formula and a worked example.
Live
Case Converter
UPPERCASE, Title Case, camelCase, snake_case, kebab-case and more — all 13 styles shown at once.
Live
Private
Live
Password Generator
Strong random passwords and memorable passphrases. Uses cryptographic randomness. Never leaves your browser.
Secure
Private
Live
QR Code Generator
QR codes for URLs, text, Wi-Fi, contacts, email and SMS. Download PNG or SVG. Custom colours and sizes.
PNG & SVG
Private
Live
Percentage Calculator
Find X% of Y, what percent X is of Y, and percentage increase or decrease.
Instant
Private
Live
Age Calculator
Exact age in years, months, days, weeks, hours and minutes. Zodiac sign and birth day of week included.
Instant
Private
Live
Date Difference
Days, weeks, months, years and business days between any two dates. Leap years handled.
Instant
Private
Live
Word Counter
Count words, characters, sentences and paragraphs live. Reading time and top keywords included.
Live
Private
Live
Tip Calculator
Tip amount, total, and split the bill between any number of people. Presets for common tips.
Instant
Private
Live
Discount Calculator
Sale price, savings and reverse lookup for the original price. Presets for 5–50% off.
Instant
Private
Live
Unit Converter
Length, weight, temperature, volume, speed — with a full conversion table showing every unit at once.
Instant
Private
Live
BMI Calculator
Body mass index in metric or imperial, with healthy weight range and prime weight for your height.
Instant
Private
Live
Loan Calculator
Monthly payment, total interest, and full yearly amortization schedule for any loan or mortgage.
Instant
Private
Built for Speed, Not Ad Clicks
Most calculator sites are bloated with popups, tracking scripts and six ad slots per page. This one isn't.
Private
Every calculation runs in your browser. Nothing is uploaded, stored or tracked. Your numbers stay yours.
Clear
Every calculator shows the formula, a worked example and common uses — so you understand the answer, not just see it.
Ad-light
A maximum of two non-intrusive ads per page. Never above the calculator, never between your input and the result.
Three Steps. No Friction.
No accounts, no download, no tutorial needed. Open a page and calculate.
1. Pick a Calculator
Choose from the eight above — or search. Each one does exactly one thing, so you always know where to go.
2. Enter Your Numbers
Type into the fields. The result updates instantly, and the URL updates too — so you can bookmark or share a specific calculation.
3. Get the Answer — and the Reasoning
Below every result you'll find the formula, a worked example, common uses and FAQs. Free to copy, free to reuse.
Frequently Asked Questions
Are these calculators free?
Yes. Every calculator on this site is completely free. No signup, no account, no payment, no hidden premium features.
Do I need to create an account?
No. Everything runs in your browser. Just open a calculator, enter your numbers, and get the result instantly.
Are my inputs stored or sent anywhere?
No. Calculations happen entirely in your browser using JavaScript. Nothing is uploaded, logged, or shared with any server. You can even run the calculators offline once the page has loaded.
How accurate are the results?
Formulas are standard and verified manually. Results are rounded for readability. For critical decisions — especially health or financial ones — always double-check with a qualified professional.
Can I use these calculators on my phone?
Yes. Every calculator is designed mobile-first and works on any device with a modern browser. They also support keyboard navigation and screen readers.
Do you show ads?
A small number of non-intrusive ads keep the site free. They never appear above the calculator or interrupt your input. If you find an ad intrusive, tell us via the contact page and we'll review it.
Can I suggest a calculator?
Yes. Use the contact page to send suggestions. Popular requests get built — usually within a week.
Who builds these?
A small independent team. No investors, no corporate owners — just people who use calculators and want them to be fast, clear and free.