Calculator tools
Interest and loan repayment calculations with visible formulas, and recipe nutrition estimates with stated sources and uncertainty.
3 tools2 run in your browser1 goes online
- Recipe Nutrition CalculatorEstimate nutrition for a recipeSends text online
- Simple Interest CalculatorInterest on a principal over timeIn your browser
- EMI CalculatorMonthly instalment and amortisationIn your browser
Work out a figure and see the formula that produced it
A calculator that only shows an answer is hard to trust. These state the formula, show the working where there is working to show, and say plainly what they exclude — so you can tell whether the number applies to your situation.
The finance calculators run entirely in your browser and are textbook calculations rather than financial advice: they exclude fees, insurance, early repayment charges and lender-specific day-count rules. The nutrition calculator looks ingredients up in a public food composition database, because an invented calorie figure would be worse than none.
Which Calculator tool do you need?
Interest that does not compound
Simple Interest Calculator applies the textbook formula with the duration in years or months.
A loan with monthly repayments
EMI Calculator gives the instalment, the total interest and a full amortisation schedule you can download as CSV.
What is actually in a recipe
Recipe Nutrition Calculator totals your ingredients from a food composition database and reports per-serving figures.
Comparing loan offers
Use the EMI schedule rather than the monthly figure alone; a longer term lowers the instalment and raises the total.
Seeing where the money goes
The amortisation schedule splits every instalment into interest and principal, which shows why overpaying early helps most.
Questions about Calculator tools
Is this financial advice?
No. The finance calculators are textbook calculations. They exclude arrangement fees, insurance, early repayment charges and any particular lender's day-count or rounding rules, and a lender's own quote is the figure that binds.
Why does the last loan instalment differ?
Each instalment is rounded to two decimal places, and the final payment absorbs the accumulated difference so the balance closes at exactly zero. The schedule shows this explicitly rather than hiding it.
Where do the nutrition figures come from?
A public food composition database, looked up by ingredient name. They are not generated by a language model, because a plausible invented figure is worse than no figure at all.
Does the currency setting change the maths?
No, it changes formatting only. The arithmetic is identical whichever of pounds, dollars, euros or rupees you choose.
Should I enter a monthly or an annual interest rate?
Annual, in both finance calculators. Entering a monthly rate as if it were annual understates the interest twelvefold, and it is the most common way one of these results goes wrong.