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.
Start here
Find the right calculator by topic
Five topic guides, each with the tools that answer it.
UK money
Take-home pay for 2026/27, VAT at 20%, 5% and 0%, mortgage and loan repayments in pounds, and hourly-to-salary pay. Rates come from GOV.UK and are dated on each page.
- UK Take-Home Pay Calculator – Salary after tax and NI (2026/27)
- VAT Calculator – Add or remove UK VAT
- Mortgage Calculator – Monthly payment, deposit, interest
- Loan Repayment Calculator – Payoff with extra payments
- Hourly to Salary Calculator – Convert hourly pay to annual salary
- Freelance Rate Calculator – Hourly rate for your income goal
US money
Loan, mortgage (with property tax and insurance), savings, hourly pay and tipping calculators that work in dollars. The tax calculator is UK-only for now; the US federal comparison in the take-home examples uses IRS 2026 figures.
- Mortgage Calculator – Monthly payment, deposit, interest
- Loan Repayment Calculator – Payoff with extra payments
- Hourly to Salary Calculator – Convert hourly pay to annual salary
- Compound Interest Calculator – Growth with monthly contributions
- Savings Goal Calculator – Reach a target with monthly deposits
- Tip and Bill Split Calculator – Tip and cost per person
Dates and age
Exact age on any date, days between two dates, working days with your own holidays, and shift hours with breaks. Leap years and month ends are handled for you.
- Age Calculator – Exact age on any date
- Date Difference Calculator – Days between two dates
- Business Days Calculator – Working days between two dates
- Time Duration Calculator – Work hours with breaks
Percentages and maths
Percentage change, working back to an original price, stacked discounts, price per unit and weighted grades, each with the formula and a worked example.
- Percentage Change Calculator – Percentage increase or decrease
- Reverse Percentage Calculator – Original price before a change
- Discount Calculator – Sale price with stacked discounts
- Unit Price Calculator – Compare packs of different sizes
- Weighted Grade Calculator – Score needed on your final
- Math & Science Quiz – 5 to 20 questions in 5 levels
Converters and creators
Compress, resize and convert images, make and read QR codes, and create invoices. Files are processed in your browser and are not uploaded.
- Image Compressor – Shrink JPG, PNG and WebP images in bulk
- Image Resizer – Resize images by pixels, percent or file size
- Image Converter – Convert between JPG, PNG, WebP and AVIF
- QR Code Generator – Links, text, Wi-Fi and contact QR codes
- QR Code Reader – Scan a QR code from an image or your camera
- Invoice Generator – Professional invoices with 10 templates and your own colours
Categories
Browse tools by category
Every calculator and converter, grouped by what you want to get done.
Guides
Latest guides with worked examples
Plain-English guides on tax, loans, dates and pricing, each with the numbers worked out and a calculator to try your own.
News & UpdatesNew
Bank Rate at 4%: What the 0.25-Point Rise Means for Your Loan Payments
The Bank of England lifted Bank Rate to 4% on 5 November 2026. See what +0.25% adds to a £15,000 loan: £1.77 a month. Free calculator included.
Ahad Noor7 min read
Money & CalculationsNew
How Much of a Pay Rise Do You Keep in the UK? 2026/27 Examples at £35,000 and £55,000
A 5% rise on £35,000 is £1,750.00 gross but £1,260.00 take-home (72p per £1). Above £50,270 you keep 58p. Worked 2026/27 examples, free calculator.
Ahad Noor5 min read
News & UpdatesNew
Mortgage Payments After the Bank Rate Rise: What 0.25% and 1% Cost per Month
Bank Rate hit 4% on 5 Nov 2026. On a £200,000, 25-year mortgage, +0.25% adds £29.32 a month and +1% adds £119.42. Tables and a free calculator.
Ahad Noor5 min read
Read all guides → · Early loan repayment calculator · UK take-home pay · VAT calculator · Freelance rate · Age calculator
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
- 32Free 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 8 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.