Everyday calculators

Quick tools for shopping, eating out, travel, dates and the kitchen. Each one shows the formula it uses.

1. Percentage

   X% of Y, what percent X is of Y, and reverse percentages.

2. Percentage calculator

   The change from one number to another, up or down.

3. Discount

   The sale price, stacked discounts and the saving.

4. Tip calculator

   A tip and the total, split between people.

5. Split the bill calculator

   Split a bill evenly or by what each person had.

6. Currency converter

   Convert between currencies at reference rates.

7. Age calculator

   Exact age in years, months and days.

8. Days between dates calculator

   The days between two dates, with or without the end date.

9. BMI calculator

   Body mass index and the healthy weight range.

10. Air fryer calculator

    Oven times and temperatures converted for an air fryer.

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