How the knife sharpening due date is worked out
A knife usually announces that sharpening is overdue only once the edge has gone. This tool takes the last sharpened date and the uses per week for each knife, together with the number of uses you want between sharpenings, then returns the uses so far, the uses left and the next due date, ordered with the fewest uses left first.
How the math runs
Uses so far divides the days from the last sharpening to the reference date by 7 to get weeks, multiplies by the uses per week, and rounds down. The next due date divides the interval by the uses per week, converts the weeks to days, rounds up, and adds that to the last sharpened date. Dates are built from year, month and day components separately, so month ends and leap years hold. Figures are current as of October 2026.
Limits and disclaimer
No officially recommended sharpening interval or edge angle is offered here. Figures in this area are widely quoted but are common practice rather than a published standard, and none has been confirmed in authoritative sources. The uses-so-far figure is a straight extension of the frequency you entered rather than a log of real use, so it is not a prediction. The tool does not assess the edge, and for stones and sharpeners you should follow the product sheet and the manufacturer's guidance first.
Frequently asked questions
No officially recommended interval is offered here. It swings widely with the steel, the cutting board and what is being cut, so set it yourself.
Angles are left out. No authoritative standard for edge angle has been confirmed. This tool counts uses and dates only.
The days from the last sharpening to the reference date are divided by 7 to get weeks, multiplied by the uses per week, then rounded down. It is a straight extension of the frequency you entered, not a record of actual use.