Free · No sign-up · Instant results
Free online tools for dates, money, study and astrology
Momentix gives you free online tools: 24 accurate calculators plus image, QR code, invoice and font tools – UK take-home pay, mortgage, VAT, age, percentages, savings, loans, BMI, grades and your Big Three – each with the formula, a worked example and clear steps.
- Dates & Time
- Percentages & Pricing
- Business & Freelance
- Savings & Loans
- Tax & VAT
- Everyday & Health
- Learn & Play
- Study
- Astrology
24 free calculators · Works in your browser · Formulas and examples included
New
Create a professional invoice in minutes
Our free invoice generator lets you pick a template, add your logo and items, recolour everything and download a clean PDF – no signup, and nothing is uploaded.
- 10 professional templates
- Colour pickers for every colour
- Paid, unpaid and partial payment status
- Logo, tax, discounts and signature
- Download PDF or PNG – nothing is uploaded
Popular tools
Popular free online tools and calculators
Start with a favourite, or browse the full collection.
Categories
Browse tools by category
Every calculator and converter, grouped by what you want to get done.
Free online calculators
Accurate answers, with the working shown
From UK take-home pay to loan payoff dates, our online calculators give you a clear result and explain how they got there.
- 24 calculators – tax, mortgage, VAT, dates, percentages and more
- Every result shows its formula and a worked example
- Tested formulas, including awkward edge cases
- Runs in your browser – your numbers stay with you
Free image tools
Make images lighter without leaving the browser
Compress, resize and convert in seconds, generate QR codes, or preview fonts – all free, private and built for phones too.
- Compress, resize and convert JPG, PNG and WebP in bulk
- Download files separately or all together as a ZIP
- QR code generator and reader, plus a Google Fonts previewer
- Files never leave your device
Turn long text into a notes image
Paste your text and get a notebook, sticky note or blackboard page – download it as PNG or PDF.
Momentix at a glance
- 37Free toolsNew ones added regularly
- 10CategoriesFrom tax to astrology
- 0Sign-ups neededJust open and use
- 100%Processed on your deviceSee the one exception in the FAQ
Why Momentix
Free online tools you can trust and understand
Correct answers are only useful if you can see how they were reached.
Tested for accuracy
Every formula is covered by automated tests, including awkward edge cases like leap days, midnight shifts and 100% discounts.
Shows its working
Each result comes with the formula, the steps using your numbers and a worked example, so you can check and learn.
Private by design
Calculations run in your browser. No account, no sign-up and the numbers you enter are not stored on our servers.
Great on phones
Big tap targets, sensible keyboards and results that fit a small screen – built for quick use on the go.
Instant and free
No waiting, no paywall and no limits. Open a tool, enter your numbers and get an answer in seconds.
Charts and comparisons
Break-even lines, savings projections, loan balance curves and side-by-side schedules make numbers easy to understand.
Free online tools for everyday tasks
Momentix is a collection of free online calculators and converters that run in your browser. Work out UK take-home pay, a mortgage payment or the days between two dates, then compress, resize and convert images, create QR codes and invoices, or turn long text into notes – all without registration.
Every tool opens fast, works on phones and does its job without signup, so you can get on with your day.
Questions
Frequently Asked Questions (FAQs)
Yes. Every calculator and browser-based tool is free to use with no account, no registration and no usage limits.
Each calculation uses a standard published formula and is covered by automated tests, including edge cases. Results are estimates for planning and learning – check important figures with an official source or a professional.
No. The numbers, dates and names you enter are processed in your browser and are not sent to our servers. The only exception is the city search in the Sun, Moon & Rising calculator, which sends the city name you type to a geocoding service.
Yes. Every page is designed for phones first, with a simple menu, large inputs and results that fit a small screen.
You can use 24 calculators across dates and time, percentages and pricing, business and freelance, savings and loans, tax and property, everyday and health, study, and astrology. Browse them all on the All Tools page.
There are 13 free browser tools in the Converters menu: an image compressor and resizer, converters between JPG, PNG, WebP and AVIF, a QR code generator and reader, a Google Fonts preview tool and an invoice generator. Files are processed on your device and never uploaded.