Numeric to Adjectival Grade Converter

Convert a supported numeric grade and independently established business/proof family to a wear-state label. Proof is a manufacture designation, not automatically Mint State or perfect; unsupported numbers rejected.

Description

Business-strike and proof describe manufacture, while a numeric grade describes condition within a grading convention.

Business-strike and proof describe manufacture, while a numeric grade describes condition within a grading convention.^[1]

This converter combines a supported grade point with a declared strike family.

When to use Numeric to Adjectival Grade Converter

Use this tool to calculate or review the supplied observations under the stated rules. Establish the coin issue, source edition, measurement basis and reference date where applicable.

How to use Numeric to Adjectival Grade Converter and understand its results

Establish the coin issue, source edition, measurement basis and reference date where applicable.
Enter numericGrade, callerVerifiedStrikeFamily, using the field meanings and rules below, then run the tool.
Read result. Inspect nested result fields where present, and review unknown records separately from known matches.
Correct any reported input issue and run again. Before using a successful result, check the stated units, signs, reference scope and observation coverage.

Input field	Meaning	Value type	Requirement
numericGrade	Numeric grade	number	Required
callerVerifiedStrikeFamily	Caller verified strike family	string	Required

Use a supported integer numeric grade from the fixed table and exact business or proof family. Grades below 60 return the standard band. Proof grades 60..70 return Proof, uncirculated-wear-state numeric range; business grades use Mint State. The input family is independently established.

Supported numeric grade	Adjectival band
1	Poor
2	Fair
3	About Good
4	Good
6	Good
8	Very Good
10	Very Good
12	Fine
15	Fine
20	Very Fine
25	Very Fine
30	Very Fine
35	Very Fine
40	Extremely Fine
45	Extremely Fine
50	About Uncirculated
53	About Uncirculated
55	About Uncirculated
58	About Uncirculated
60	Mint State
61	Mint State
62	Mint State
63	Mint State
64	Mint State
65	Mint State
66	Mint State
67	Mint State
68	Mint State
69	Mint State
70	Mint State

label=(grade≥60 and family=proof)?proofWearState:gradeTable[grade]

Use the matching field units and the exact boundary, ordering and reference rules above.

Output field	Meaning	Value type
result	Calculated observation or qualified reference	object
result.adjectivalBand	adjectival Band	string
result.strikeFamily	strike Family	string

json

{
  "input": {
    "numericGrade": 12,
    "callerVerifiedStrikeFamily": "business"
  },
  "output": {
    "result": {
      "adjectivalBand": "Fine",
      "strikeFamily": "business"
    }
  }
}

Limitations and assumptions

Coin identification, reference applicability and measurement uncertainty require separate evidence. A returned explanation or arithmetic agreement does not establish authenticity, a certified grade or a current market value.

Missing required fields, unknown fields, wrong types and violated rules return input issues. Numeric values and outputs must be finite. Extremely large composite outputs are rejected.

Alternative or Complementary methods

For a related step, use Sheldon Numeric Grade Lookup: Numeric coin grades map to conventional wear-state bands at specific supported grade points. For a complementary comparison, use Adjectival to Numeric Grade Converter: A broad adjectival grade band can contain several supported numeric grades.

References

Numeric to Adjectival Grade Converter — tool.io

Similar or alternative tools

Sheldon Numeric Grade Lookup
Numeric coin grades map to conventional wear-state bands at specific supported grade points.
Adjectival to Numeric Grade Converter
A broad adjectival grade band can contain several supported numeric grades.