usefulweb.site How Long Will It Last?

Everyday problem-solving

How Long Will It Last?

Estimate remaining life of appliances and home components and plan the replacement.

years

Try an example: 7-year-old refrigerator, normal use · 10-year-old water heater, heavy use, occasional maintenance · 4-year-old washing machine, light use

How it works

Pick an appliance or home component, enter its age, how hard it is used and how well it is maintained. The tool uses the life-expectancy ranges published in InterNACHI's Standard Estimated Life Expectancy Chart for Homes to estimate remaining years, the share of life used, and a replacement planning window.

  • Base range: the YEARS value for the item from InterNACHI's Standard Estimated Life Expectancy Chart for Homes (e.g. '9 to 13'). Single values use the same min and max; 'N+' values are open-ended (only a minimum).
  • Adjusted range = base range × usage multiplier (light 1.15, normal 1.0, heavy 0.8) × maintenance multiplier (regular 1.0, occasional 0.9, neglected 0.75). These multipliers are this tool's own assumptions, not published figures; InterNACHI's values already assume regular recommended maintenance and normal wear and tear.
  • Remaining years = max(0, adjusted min − age) to max(0, adjusted max − age).
  • Life used = age ÷ midpoint of the adjusted range × 100 (open-ended: ÷ adjusted minimum).
  • Status: < 50% early life, 50–80% mid-life, ≥ 80% but below adjusted minimum approaching end, between adjusted min and max within end-of-life range, beyond adjusted max beyond expected life.
  • Replacement window = current year + remaining min … current year + remaining max (rounded to whole years).

Life expectancies are guidelines only, not guarantees or warranties (InterNACHI).

Sources

For scripts and AI agents

  • JSON API: POST https://howlongwillitlast.usefulweb.site/api/v1/calculate (same calculation as this page)
  • Interface description: OpenAPI 3.1 · AI guide: llms.txt
  • MCP server (Streamable HTTP): https://howlongwillitlast.usefulweb.site/mcp · tool name how_long_will_it_last
Example request
curl -s -X POST https://howlongwillitlast.usefulweb.site/api/v1/calculate \
  -H 'content-type: application/json' \
  -d '{"item":"refrigerator","ageYears":7,"usage":"normal","maintenance":"good"}'
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