Practical day-to-day calculators. — 20 free tools.
Calculate your weighted GPA from up to five courses.
★Convert marks into a percentage and letter grade.
★Estimate the fuel needed and cost for a trip from distance, mileage and price.
★Estimate your electricity bill from units consumed, rate and fixed charges.
★Split a bill and tip between people.
★Calculate the final price after a discount.
★Apply two stacked discounts to a price.
★Add sales tax to a price.
★Compare value by price per unit.
★Find the cost per use of a purchase.
★Split a monthly grocery budget per week and per person.
★Calculate what percentage of income you save.
★Estimate how long it takes money to double.
★Estimate the running cost of an appliance.
★Estimate monthly water usage cost.
★Estimate roast cooking time by weight.
★Scale a recipe ingredient to a new serving size.
★Compare pizza value by area per rupee.
★Calculate coffee grounds for a brew ratio.
★Find the age difference between two people.
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Author: CalculatorFC Editorial Team
Reviewed by: CalculatorFC Accuracy Review Desk
Last updated: June 23, 2026
Editorial policy: We explain formulas, assumptions, limitations and examples in plain language and update pages when methods, rates or standards change.
Fact-checking policy: Calculator formulas are reviewed against standard mathematical, financial, scientific or public reference methods where applicable.
Sources: Standard formulas, official government references where relevant, public methodology references and calculator-specific documentation.
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