Field Calculator VB Script Logic

Advanced Field Logic Calculator

Choose a logic mode, enter test values, and generate reusable field calculation code.

Example Data Table

Formula Used

Numeric: Result = Round((Field Value × Multiplier) + Adjustment, Precision).

Percent: Percent Change = ((New Value − Old Value) ÷ Old Value) × 100.

Text: Clean Text = Prefix + Case Rule(Trim(Field Value)) + Suffix.

Conditional: If Field Value is greater than or equal to the threshold, return the true label. Otherwise, return the false label.

Date: New Date = DateAdd("d", Days To Add, Field Date).

Null Guard: If the value is null or blank, return the default value. Otherwise, keep the original value.

How to Use This Calculator

1. Select the logic mode that matches your field update task.
2. Enter a target field name without spaces or special characters.
3. Add numeric, text, date, threshold, or default values as needed.
4. Press the calculate button to preview the output.
5. Copy the generated expression and pre-logic block.
6. Export the results when you need a report or audit record.

Field Calculator Logic Guide

Why Use This Field Logic Tool

Field updates can change thousands of records at once. A small logic mistake may spread through a full table. This calculator gives you a safe workspace before you apply a field rule. You can test numbers, text, dates, null checks, and conditional decisions. The preview result shows what the rule returns for your sample value. The generated logic block also helps you document the rule for review.

Common Use Cases

VB style field logic is often used when attribute values need cleanup. A planner may classify parcels. A GIS editor may convert codes into readable labels. A data manager may trim names, add prefixes, or guard against missing values. The same idea applies to many record systems. A tested rule is easier to trust.

Simple Workflow

This page uses a simple workflow. First, choose the rule type. Then enter a field name and sample values. Add a multiplier, default value, threshold, or text pattern. Submit the form to calculate a sample output. The result appears above the form. This placement lets users compare the returned value with the inputs quickly.

Review Before Updating

The calculator does not replace careful review inside your mapping or database software. It helps you plan logic, reduce typos, and explain the expression before running a batch update. Always test on a copy of your data when the table is important. Also confirm field types. Text fields, numeric fields, and date fields handle values differently.

Supported Rule Types

The formula section explains each supported mode. Numeric mode applies a multiplier and an adjustment. Percent mode compares old and new numbers. Text mode cleans and formats strings. Conditional mode returns one value when a threshold is met and another value when it is not. Date mode adds days to a base date. Null guard mode protects empty records with a fallback.

Exports and Team Notes

Use the export buttons after each run. The CSV file is useful for spreadsheets. The PDF file is useful for reports, tickets, and approval notes. The example table shows common rules and expected results. Keep those examples near your team guide. Clear examples make future edits faster and safer.

Good notes help new editors understand why each field value changed during maintenance and later audits for quality.

FAQs