Practical calculation guides
Straightforward explanations to understand the method before you use a calculator.
Practical guide
How to Calculate Percentages and Percentage Change
A practical guide to finding a percentage, a percentage increase, decrease and reverse percentage.
Read guide →Practical guideSimple Interest vs Compound Interest: The Practical Difference
Understand the difference between simple and compound interest before using a savings or loan calculator.
Read guide →Practical guideHow Fixed Loan and Mortgage Payments Work
Learn what a fixed payment estimate includes and what it leaves out.
Read guide →Practical guideHow to Calculate Dates, Days and Time Durations
A clear method for days between dates, adding days and measuring time periods.
Read guide →Practical guideA Practical Guide to Unit Conversions
Learn how to choose units, use conversion factors and avoid common temperature errors.
Read guide →Practical guideHow to Work Out Discounts, Sale Prices and Savings
Use discounts correctly and understand why taxes and stacked offers can change the final price.
Read guide →Practical guideHow to Split a Bill Fairly
A simple method for splitting a shared bill with tax, tip and unequal shares.
Read guide →