Keep units, date rules and rounding visible when a result is shared.
Start with the source definition
A useful conversion begins with what the value represents. An elapsed calendar-day difference is not a count of working days. A UTC offset is not a complete time-zone rule. A percentage has a base, while a ratio may be expressed as a multiplier or as two reduced integers.
Check one small example
Two hours and 30 minutes correspond to 2.5 decimal hours because 30 minutes is half an hour. Writing 2.30 treats the minutes as hundredths and changes the duration. Keep the original hours and minutes in the record before converting them for billing or reporting.
Record precision and boundaries
Rounding to a useful display precision may hide a small difference. Whole-item ordering and staffing can require upward rounding even when a geometric or financial result allows fractions. For approximate decimal-to-fraction conversion, record the bounded denominator; the displayed fraction may be an approximation rather than an exact representation.
Preserve the receiving convention
Before copying a result, confirm whether the receiving sheet or application expects percentages, fractions, decimal hours or a specific date format. A successful local conversion cannot select that convention on the receiver’s behalf. Save the source, method, output and intended destination together to make later discrepancies traceable.
Review record
| Source | Convention | Result | Next check |
|---|---|---|---|
| Record the measured or supplied values. | State units, period and inclusions. | Retain the original calculation. | Name the person and evidence needed before use. |
Continue the decision
How to Build a Simple Marketing Measurement System · A Cost Record for a 3D Print Job.
Keep the displayed formula, input units and model scope with the result. Corrections or questions can be sent through the request section on this page.
Content updated: October 11, 2026