Tabaix / Calculators
Check arithmetic and conversions with explicit inputs, units and rounding. Record assumptions with your result.
Read: Percentage changes and unit conversions: a practical checking guide
Percentage calculatorFind a specified percentage of a number with a transparent multiplication.Age calculatorCount completed years between a birth date and an explicitly selected review date.Aspect ratio calculatorReduce two positive dimensions to their simplest width-to-height ratio.Loan payment estimateEstimate monthly payments using a fixed rate and term, with a zero-interest calculation when applicable.Manual-rate currency calculatorMultiply an amount by the exchange rate you enter instead of relying on stale live-rate claims.Length unit converterConvert a length between supported metric and imperial units.UTC to time zoneShow an explicitly offset timestamp in a selected IANA time zone.Date differenceCount elapsed calendar days between two dates using UTC date boundaries.Random integersGenerate a bounded list of cryptographically random integers in an inclusive range.Scientific expression calculatorEvaluate a supported arithmetic expression without executing JavaScript code.
When these tools are useful
- Checking a percentage change before quoting or publishing a number.
- Converting units for a specification, recipe or product listing.
- Estimating a total, a share or a difference without spreadsheet errors.
- Teaching or verifying a calculation step by step.
Write down what each number represents before calculating: a percentage of what, in which unit, rounded how. Most wrong answers are right calculations of the wrong question — especially with percentages, where the base value decides everything. If the result will be published or sent to a customer, repeat the calculation with the inputs swapped or estimated by hand to catch typing errors.
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