Swift A little clarity goes a long wayWork out the numbers.
Work out the numbers.
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From the paint for your spare room to your next semester’s GPA. Simple calculators, with the reasoning right beside them.
◎ Browser-based calculations↔ US & metric paint inputs≡ Formulas and worked examples
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Home improvement
Paint calculator
Estimate wall paint, allow for extra coats, and round up to whole US gallons.
Open calculator Grades & schoolGPA calculator
Calculate semester and cumulative GPA using course credits on a 4.0 scale.
Open calculator Money & housingMortgage payment calculator
See principal, interest, taxes, insurance, and an annual balance schedule.
Open calculatorBeyond the answerA number is more useful
A number is more useful
when you know what it means.
Read the assumptions, follow an example, and see what your estimate includes before you make a decision.
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