Calculation Guides
Each guide explains a calculation step by step, works through real examples, and includes a free calculator so you can run your own numbers.
Finance & Business
How to Calculate Compound Interest on Savings
The compound interest formula explained step by step, with worked examples for annual, monthly and daily compounding, regular deposits, and AER.
Animals & Pets
How Much to Feed a Dog by Weight
Daily calories and grams of food for dogs from 2 kg to 60 kg, by activity level, using the veterinary RER formula, with a feeding chart and calculator.
Agriculture & Farming
How to Calculate Fertiliser per Acre
Work out fertiliser rates per acre or hectare for urea 46-0-0, DAP 18-46-0, MOP 0-0-60 and compound NPK blends, with worked examples and unit conversions.
Medical & Pharmaceutical
How to Calculate Medication Dosage by Body Weight
The mg/kg dose formula, converting doses to millilitres of liquid medicine, pounds to kilograms, maximum-dose caps and worked examples, with a calculator.