NumLuma calculators
Everyday
Quick calculations for percentages, dates, prices and everyday decisions.
Start hereHigh-utility calculators for the most common everyday questions.
ED Everyday ↗
Discount Calculator
Calculate sale price and savings.
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Percentage Calculator
Find X% of any number.
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Fuel Cost Calculator
Estimate trip fuel cost from MPG.
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Tip Calculator
Split a bill with tip.
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Date Difference Calculator
Count days between two dates.
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Percentage Change Calculator
Measure percentage increase or decrease.
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More everyday calculators5 more tools
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Age Calculator
Find age between two dates.
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Days Until Calculator
Count days to a target date.
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Split Bill Calculator
Split a total bill evenly with optional tip.
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Time Duration Calculator
Calculate elapsed hours between two times.
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Unit Price Calculator
Find price per item, weight or unit.
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Curated toolkitPercentage & Price CalculatorsBest for shopping, price comparisons and everyday percentage questions.
↗Curated toolkitDate & Time CalculatorsBest for countdowns, age checks, elapsed-time questions, schedules and work-hour calculations.
↗Learn the numbers
Questions and formulas for everyday.
Move between the calculation, the worked question and the underlying formula without starting over.
Using these tools
Quick answers for daily decisions.
Everyday tools handle percentages, dates, prices, tips, fuel and other routine calculations. They are designed for speed without hiding the underlying arithmetic.
- Confirm units before calculating
- Check date and time direction
- Round only after the main calculation