Free Calculator Tools — Loan Calculator, GPA, Percentage and More

Enter the loan amount, the annual interest rate, and the loan term in months or years. The calculator uses the standard amortisation formula to compute the fixed monthly payment and the total amount paid over the life of the loan, including total interest. This is useful for comparing mortgage options, car finance quotes, and personal loan offers before you sign anything.

BMI (Body Mass Index) is a simple ratio of weight to height squared and gives a rough population-level screening number. It does not account for muscle mass, bone density, age, sex, or body composition. A heavily muscled person may have a high BMI without excess body fat. A person with low muscle mass may have a normal BMI despite unhealthy fat levels. Use the BMI Calculator as a starting data point, not a clinical diagnosis — a doctor or dietitian can give a more complete assessment.

Open the Percentage Calculator and enter the values you need. The tool handles three common percentage questions: what is X% of Y, X is what percentage of Y, and percentage increase or decrease between two numbers. For example, to find 15% of 340, enter 15 in the first field and 340 in the second — the answer is 51.

Compound interest is interest calculated on both the original principal and the accumulated interest from previous periods. It grows faster than simple interest because each period you earn interest on a larger base. The formula is A = P(1 + r/n)^(nt), where P is the principal, r is the annual interest rate as a decimal, n is the number of times interest compounds per year, and t is the time in years. The Compound Interest Calculator handles this automatically — enter the principal, rate, compounding frequency, and term to see the final balance and total interest earned.

Open the Date Difference Calculator, enter the start and end dates, and it shows the number of days, weeks, months, and years between them. This is useful for calculating deadlines, figuring out how long a subscription or warranty runs, computing age in days, and planning project timelines.

Enter the bill amount and the tip percentage into the Tip Calculator. The tool shows the tip amount, the total per bill, and optionally splits the total between multiple people. Common tip percentages are 10% for basic service, 15–18% for standard restaurant service, and 20% or more for excellent service. The calculator saves the mental arithmetic in the moment.

A discount calculator starts from the original price and a discount percentage and tells you the sale price and the amount saved. A profit margin calculator starts from the cost and the selling price and tells you the gross profit and the profit margin as a percentage. Use the Discount Calculator as a buyer to evaluate deals; use the Profit Margin Calculator as a seller to set prices that cover costs and hit a target margin.

The VAT Calculator lets you add or remove VAT from a figure. Enter the amount and the VAT rate (for example, 20% in the UK or 7.5% in Nigeria) and choose whether the amount already includes VAT or not. If VAT is not included, the tool adds it and shows the VAT-inclusive price. If VAT is already included, the tool extracts the VAT portion and shows the pre-VAT price.