Hiking footwear replacement log calculator

Calculate total logged distance by footwear and logged distance since supplied last inspection with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use total logged distance by footwear and logged distance since supplied last inspection to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Footwear: ID, opening logged km, last inspected at total km, supplied inspection interval km
A,100,80,50 B,200,190,60
New log records: ID, footwear, date, km; or none
L1,A,2026-10-18,10 L2,A,2026-10-19,20 L3,B,2026-10-20,20
Audit date
2026-10-20
Total logged distance by footwear (km)
A: 130; B: 220
Logged distance since supplied last inspection (km)
A: 50; B: 30
Supplied next inspection distance counter (km)
A: 130; B: 250
Distance to that inspection counter, signed (km)
A: 0; B: 30
Footwear at/past supplied inspection counter
A

Try another scenario

Footwear: ID, opening logged km, last inspected at total km, supplied inspection interval km
A,110,80,50 B,200,190,60
New log records: ID, footwear, date, km; or none
L1,A,2026-10-18,10 L2,A,2026-10-19,20 L3,B,2026-10-20,20
Audit date
2026-10-20
Total logged distance by footwear (km)
A: 140; B: 220
Logged distance since supplied last inspection (km)
A: 60; B: 30
Supplied next inspection distance counter (km)
A: 130; B: 250
Distance to that inspection counter, signed (km)
A: -10; B: 30
Footwear at/past supplied inspection counter
A
Calculation method

Calculation method

Total logged distance by footwear (km)

Opening distance+new log distances dated on/before audit.

Logged distance since supplied last inspection (km)

Total logged−last-inspected counter.

Supplied next inspection distance counter (km)

Last inspected counter+supplied interval, without automatically recording a new inspection.

Distance to that inspection counter, signed (km)

Next counter−total logged distance.

Footwear at/past supplied inspection counter

List records where total logged≥next counter; this is an inspection reminder only.

Symbols and units
a
Footwear: ID, opening logged km, last inspected at total km, supplied inspection interval km
b
New log records: ID, footwear, date, km; or none
c
Audit date

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • A supplied distance-counter reminder ledger, not a footwear lifespan prediction, inspection result or replacement recommendation. Opening distance must already exclude all new log rows.
Are these inputs private?

These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.

Further reading

OpenStax: ratios and rates; all itinerary rates, limits and scenario rules are supplied inputs ↗

Background reading; this does not imply endorsement or independent review of SumFizz.

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