About NumGenie
NumGenie is a simple idea: give people fast, accurate, and free tools that solve everyday problems. From QR code generation and a strong password generator to practical calculators for percentages, age by date of birth, days between dates, BMI, and loan repayments in the UK, the goal is the same: clear inputs, correct results, and no hassle.
What you can do here
- Free QR code generator (no sign up) for links, text, Wi-Fi, and contact details.
- Password generator with length, symbols, and copy-to-clipboard.
- Percentage calculators for increase, decrease, and % of a number.
- Age calculator by date of birth with years, months, and days.
- Date calculators for days between dates and add/subtract days.
- BMI calculator that supports metric and imperial.
- Unit conversions for length, weight, and temperature.
- Loan and repayment calculators (UK-friendly) including APR and monthly cost.
- Compound interest and investment growth estimates.
- Stamp Duty (UK) and VAT calculator.
- Random number, dice roller, stopwatch, and countdown.
- PDF tools and Office to PDF converter.
Our approach
We design each tool to be mobile-first, accessible, and fast. Inputs are plain. Results are easy to read and copy. No clutter. No confusing options you don’t need.
Accuracy and transparency
Results use standard formulas and well-known methods. For example, compounding and APR for loan tools, WHO guidance ranges for BMI, and ISO rules where relevant. Rounding is shown in the UI when it matters. If a calculation has limits or assumptions, we explain them on the page.
Why people choose NumGenie
- Quick answers with minimal typing.
- No paywalls. Core tools are free to use.
- Plain language. Labels and tips are short and clear.
- Works on any device. Optimised for phones, tablets, and desktops.
Who we are
NumGenie is built by a small developer-led team in the UK. We like practical tools, tidy code, and helpful UX. The project started to solve the same tasks we deal with every day and grew from there.
Responsible use
NumGenie is for general information and learning. It is not financial, medical, or legal advice. For important decisions, double-check figures or speak to a qualified professional.
Contact
Got a bug to report, a new tool idea, or a feature request? We’d love to hear from you. Email hello@numgenie.com.
Roadmap
- More UK-focused money tools: mortgage calculator UK, take-home pay estimator.
- Everyday math helpers: ratio calculator, average and median calculator.
- Quality-of-life updates: keyboard shortcuts, better sharing, and printable results.
FAQs
Is the QR code generator free?
Yes. You can make unlimited QR codes without an account.
How do you keep calculations accurate?
We implement standard formulas and test against sample cases. Notes are shown where assumptions apply.
Can I use the tools on my phone?
Yes. All pages are responsive and work well on mobile.
Do you store my inputs?
No. Inputs are processed to show your result and are not saved to identify you. See our Privacy Policy.
Topics we cover
free online calculators, percentage increase calculator, age calculator by date of birth, days between dates calculator, bmi calculator uk, loan repayment calculator uk, apr calculator, unit converter online, free qr code generator no sign up, strong password generator
Last updated August 2025.