Guides
Practical explanations of the math behind everyday money decisions, with real numbers and charts.
- How to calculate VAT: add it, remove it and check itLearn how to add VAT to a price, remove VAT from a gross amount and avoid the most common VAT mistake, with worked examples, charts and a free calculator.
- Compound interest explained: what 200 a month can becomeSee how compound interest turns 200 a month into a six-figure balance, why starting early matters more than the rate, and how to estimate your own growth.
- 15-year vs 30-year mortgage: what the difference really costsCompare 15, 20, 25 and 30-year mortgages side by side: monthly payments, total interest and how fast the balance falls, with charts and a free calculator.
All calculators
- VAT calculatorAdd or remove VAT, with withholding and equivalence surcharge.
- Percentage calculatorPercent of a number, percentage change, increases and decreases.
- Salary calculatorTurn gross pay into net take-home pay per month, week and hour.
- Margin calculatorProfit margin, markup and the selling price for a target margin.
- Break-even calculatorHow many sales you need to cover your costs and reach a profit goal.
- Word counterCount words, characters, sentences and reading time.
- Calorie calculatorDaily calories, BMR, BMI and a balanced macro split.
- Tip calculatorWork out the tip and split the bill between friends.
- Compound interest calculatorSee how savings grow with regular deposits over time.
- Mortgage calculatorMonthly payment, total interest and a yearly repayment schedule.
- Rent affordability calculatorHow much rent you can afford on your income.
- Sales tax calculatorAdd sales tax to a price or find the price before tax.
- Discount calculatorFind the sale price, what you save and stacked discounts.
- Hourly to salary calculatorConvert an hourly wage to annual salary, and back again.
- Overtime calculatorTime-and-a-half, double time and your weekly gross pay.
- Time card calculatorAdd up weekly hours with unpaid breaks and overtime.
- Date difference calculatorDays, weeks, months and business days between two dates.
- Age calculatorExact age in years, months, days and your next birthday.
- Pet cost calculatorMonthly, first-year and lifetime cost of a dog or cat.