About SmartCalc Converter
SmartCalc Converter is a free website that puts everyday calculations and unit conversions in one simple, fast place.
Why we built it
Most people need a calculator or a converter several times a week, for a sale price, a bill split, a recipe or a trip abroad. Searching for the right tool each time wastes minutes and often means pages full of clutter. We built SmartCalc Converter to be quick to open, easy to read and pleasant to use on a phone.
What you can do
Calculator
Everyday sums with a clean keypad.
Percentage and discount
Sale prices, tax and tips.
Profit and loss
Know if a sale made money.
Converter
Length, weight, temperature, currency.
Our approach
- Simple: clear controls and readable results, with no sign-up.
- Private: calculations run in your browser. See our Privacy Policy.
- Honest: currency rates are for guidance only, and we say so.
- Free: the tools are free to use.
Who SmartCalc Converter is for
Shoppers checking a sale price, small shop owners checking profit, students practising percentages, travellers converting currency and anyone who needs a quick unit conversion. If you have a number and a question about it, there is probably a tool here for it.
How to get the best results
- Percentage and discount: choose the mode first (percentage of a number, discounted price or added percentage), then enter the numbers. Read our guide on percentage and discount if you are unsure which mode fits.
- Profit and loss: enter the full cost, including shipping, packaging and fees, so the profit is realistic. The margin versus markup guide explains why percentages differ.
- Converter: pick the category, then the two units. For currency, check the rate note under the tool, because rates are for guidance only. See common unit conversions for quick reference.
- Calculator: estimate the answer in your head first, then compare it with the result to catch typing slips.
How accurate are the results?
The tools use standard formulas, and calculations happen in your browser. Currency rates come from public reference sources when available and can differ from the rate your bank gives you. Treat results as guidance, and check important figures with your own records or a qualified professional. Our FAQ answers 60 common questions in more detail.
Need help or have an idea?
Found a mistake, want a new tool or have a topic for an article? Use the contact page. Tell us the tool, the values you entered and what you expected, and we can look into it much faster.
Learn more
Our articles explain the maths behind each tool in plain language. If you spot a mistake or want a new tool, please contact us.