If you’ve ever found yourself jumping between different websites just to work out a tax estimate, remove VAT, or compare mortgage costs, you’ll know how frustrating it can be. Some tools are slow, cluttered, or give you a half-answer that leaves you needing another calculator straight after.
SuperSimpleCalculator.com is one of our projects, built to fix that.
The idea is simple: calculators should be fast and easy to use — but the results should still feel advanced. “Super simple” doesn’t mean basic; it means you can get what you need quickly, with an output that covers everything properly so nothing important is missing.
They also work the way you’d expect modern tools to work:
Below are some of the most useful calculators currently available.
A currency converter is one of those tools you end up using constantly — whether you’re travelling, comparing costs online, or working out what something costs in pounds vs euros.
UK income tax can feel confusing because the amount you take home isn’t always obvious from your salary. This calculator is designed to make the result easy to understand, while still giving you a detailed output that’s genuinely useful.
Use the UK Income Tax Calculator (2025–2026)
Whether you’re comparing rates, testing different terms, or just trying to get a quick monthly repayment figure, a mortgage calculator should be quick and reliable. This one keeps the input simple but delivers the detail you need in the output.
Use the UK Mortgage Calculator
VAT calculations are easy to get wrong when you’re rushing — especially when you need to add VAT to a net figure or remove VAT from a gross total. This calculator makes it instant, so you can move on quickly and stay accurate.
If you’re comparing property costs across the UK and Spain, it’s easy to get stuck bouncing between currency conversions and mortgage estimates. This calculator is designed to keep that process simple, while still giving a complete output that actually helps with decision-making.
Use the UK to Spain Mortgage Calculator
This project is actively being expanded, and new, genuinely useful calculators are being added over time. The goal stays the same: keep everything fast and easy to use, while making sure the output is detailed enough that you don’t feel like you need to use three other tools afterwards.
If you want to browse what’s available, start here:
