Every calculation, made simple.
From percentages and conversions to mortgages and everyday planning, get a clear answer without the clutter.
167 calculators and growing
Money, maths, health, home, conversions and everyday tools.
Popular right now
Tip: Bookmark this page — new tools will appear here as they’re released.
Start with a popular calculator
Fast access to the everyday calculations people return to most.
Made for everyday decisions
Start with a useful collection or read the latest plain-English guide.
Money & business
Plan the numbers clearly
Loans, margins, markups, savings and business tools.
Home & everyday
Measure before you start
Paint, tiles, recipes, dates, energy and journey planning.
Latest guide
Percentages without guesswork
Four simple methods for discounts, changes and working backwards.
UK calculators
Start with these four. Each one is built to load quickly, work on mobile, and give a clear result without the fluff.
Why Super Simple Calculator?
Most calculator sites are slow, messy and filled with distractions. This site is built the opposite way — lightweight pages, clear inputs, and results that actually help you decide.
Clear totals, sensible breakdowns, and outputs you can trust for planning.
You won’t be fighting popups and nonsense. Just the calculator and the info.
The goal is an all-in-one finance calculator library — UK first, then worldwide.
FAQs
Are these calculators accurate?
They’re built for planning and comparison using standard calculation methods. Real lenders, tax rules and fees can vary, so always confirm important decisions with official sources or a professional.
Will you add calculators for other countries?
Yes — the long-term plan is calculators for multiple countries. The UK section is being built first, then expansion from there.
Can I embed these calculators on my own website?
Some calculators include an embed option. More embed-ready calculators will be added as the site grows.