diff --git a/src/datatables/data/american_wire_gauge.ts b/src/datatables/data/american_wire_gauge.ts
new file mode 100644
index 0000000..218ab9d
--- /dev/null
+++ b/src/datatables/data/american_wire_gauge.ts
@@ -0,0 +1,62 @@
+export default {
+  title: 'American Wire Gauge',
+  columns: [
+    {
+      diameter: {
+        title: 'Diameter',
+        type: 'number',
+        unit: 'mm'
+      }
+    }
+  ],
+  data: {
+    '0000': { diameter: 11.684 },
+    '000': { diameter: 10.405 },
+    '00': { diameter: 9.266 },
+    '0': { diameter: 8.251 },
+    '(4/0)': { diameter: 11.684 },
+    '(3/0)': { diameter: 10.405 },
+    '(2/0)': { diameter: 9.266 },
+    '(1/0)': { diameter: 8.251 },
+    '1': { diameter: 7.348 },
+    '2': { diameter: 6.544 },
+    '3': { diameter: 5.827 },
+    '4': { diameter: 5.189 },
+    '5': { diameter: 4.621 },
+    '6': { diameter: 4.115 },
+    '7': { diameter: 3.665 },
+    '8': { diameter: 3.264 },
+    '9': { diameter: 2.906 },
+    '10': { diameter: 2.588 },
+    '11': { diameter: 2.305 },
+    '12': { diameter: 2.053 },
+    '13': { diameter: 1.828 },
+    '14': { diameter: 1.628 },
+    '15': { diameter: 1.45 },
+    '16': { diameter: 1.291 },
+    '17': { diameter: 1.15 },
+    '18': { diameter: 1.024 },
+    '19': { diameter: 0.912 },
+    '20': { diameter: 0.812 },
+    '21': { diameter: 0.723 },
+    '22': { diameter: 0.644 },
+    '23': { diameter: 0.573 },
+    '24': { diameter: 0.511 },
+    '25': { diameter: 0.455 },
+    '26': { diameter: 0.405 },
+    '27': { diameter: 0.361 },
+    '28': { diameter: 0.321 },
+    '29': { diameter: 0.286 },
+    '30': { diameter: 0.255 },
+    '31': { diameter: 0.227 },
+    '32': { diameter: 0.202 },
+    '33': { diameter: 0.18 },
+    '34': { diameter: 0.16 },
+    '35': { diameter: 0.143 },
+    '36': { diameter: 0.127 },
+    '37': { diameter: 0.113 },
+    '38': { diameter: 0.101 },
+    '39': { diameter: 0.0897 },
+    '40': { diameter: 0.0799 }
+  }
+};
diff --git a/src/datatables/data/index.ts b/src/datatables/data/index.ts
new file mode 100644
index 0000000..d9efaca
--- /dev/null
+++ b/src/datatables/data/index.ts
@@ -0,0 +1,3 @@
+export const allDataTables: { [key: string]: { [key: string]: any } } = {
+  'american-wire-gauge': {}
+};
diff --git a/src/datatables/data/material_electrical_properties.ts b/src/datatables/data/material_electrical_properties.ts
new file mode 100644
index 0000000..8b78de9
--- /dev/null
+++ b/src/datatables/data/material_electrical_properties.ts
@@ -0,0 +1,20 @@
+export default {
+  title: 'Material Electrical Properties',
+  columns: [
+    {
+      resistivity_20c: {
+        title: 'Resistivity at 20°C',
+        type: 'number',
+        unit: 'Ω/m'
+      }
+    }
+  ],
+  data: {
+    copper: {
+      resistivity: 1.68e-8
+    },
+    aluminum: {
+      resistivity: 2.82e-8
+    }
+  }
+};
diff --git a/src/datatables/index.ts b/src/datatables/index.ts
new file mode 100644
index 0000000..5c3ff98
--- /dev/null
+++ b/src/datatables/index.ts
@@ -0,0 +1,17 @@
+import type { DataTable } from './types.ts';
+import { allDataTables } from './data/index';
+
+export async function getDataTable(name: string): Promise<DataTable> {
+  const x = await import(`./${name}`);
+  return x.default;
+}
+
+export async function listDataTables(): Promise<{ name: string }[]> {
+  const x: { name: string }[] = [];
+  for (const key in allDataTables) {
+    x.push({ name: key });
+  }
+  return x;
+}
+
+export { DataTable };
diff --git a/src/datatables/types.ts b/src/datatables/types.ts
new file mode 100644
index 0000000..37f4f48
--- /dev/null
+++ b/src/datatables/types.ts
@@ -0,0 +1,19 @@
+/* 
+Represents a set of rows indexed by a key.
+Used for calculator presets
+
+*/
+export interface DataTable {
+  [key: string]: {
+    title: string;
+    /* A JSON schema properties  */
+    columns: {
+      [key: string]: any;
+    };
+    data: {
+      [key: string]: {
+        [key: string]: any;
+      };
+    };
+  };
+}
diff --git a/src/pages/tools/number/generic-calc/data/index.ts b/src/pages/tools/number/generic-calc/data/index.ts
new file mode 100644
index 0000000..727349c
--- /dev/null
+++ b/src/pages/tools/number/generic-calc/data/index.ts
@@ -0,0 +1,3 @@
+import ohmslaw from './ohms_law';
+
+export default [ohmslaw];
diff --git a/src/pages/tools/number/generic-calc/data/ohms_law.ts b/src/pages/tools/number/generic-calc/data/ohms_law.ts
new file mode 100644
index 0000000..25bbc66
--- /dev/null
+++ b/src/pages/tools/number/generic-calc/data/ohms_law.ts
@@ -0,0 +1,29 @@
+import type { GenericCalcType } from './types';
+
+const ohmsLawCalc: GenericCalcType = {
+  title: "Ohm's Law",
+  name: 'ohms-law',
+  formula: 'V = I * R',
+  selections: [],
+  variables: [
+    {
+      name: 'V',
+      title: 'Voltage',
+      unit: 'V',
+      default: 5
+    },
+    {
+      name: 'I',
+      title: 'Current',
+      unit: 'A',
+      default: 1
+    },
+    {
+      name: 'R',
+      title: 'Resistance',
+      unit: 'Ω'
+    }
+  ]
+};
+
+export default ohmsLawCalc;
diff --git a/src/pages/tools/number/generic-calc/data/types.ts b/src/pages/tools/number/generic-calc/data/types.ts
new file mode 100644
index 0000000..084413b
--- /dev/null
+++ b/src/pages/tools/number/generic-calc/data/types.ts
@@ -0,0 +1,21 @@
+export interface GenericCalcType {
+  title: string;
+  name: string;
+  formula: string;
+  selections?: {
+    title: string;
+    source: string;
+    default: string;
+    bind: {
+      [key: string]: string;
+    };
+  }[];
+  variables: {
+    name: string;
+    title: string;
+    unit: string;
+
+    // If absence, assume it's the default target var
+    default?: number;
+  }[];
+}
diff --git a/src/pages/tools/number/generic-calc/data/wire_voltage_drop.ts b/src/pages/tools/number/generic-calc/data/wire_voltage_drop.ts
new file mode 100644
index 0000000..e69de29
diff --git a/src/pages/tools/number/generic-calc/index.tsx b/src/pages/tools/number/generic-calc/index.tsx
index 4cabf41..2b8b69e 100644
--- a/src/pages/tools/number/generic-calc/index.tsx
+++ b/src/pages/tools/number/generic-calc/index.tsx
@@ -1,6 +1,7 @@
 import {
   Box,
-  InputLabel,
+  Autocomplete,
+  TextField,
   Radio,
   Table,
   TableBody,
@@ -13,54 +14,41 @@ import ToolContent from '@components/ToolContent';
 import { ToolComponentProps } from '@tools/defineTool';
 import ToolTextResult from '@components/result/ToolTextResult';
 import TextFieldWithDesc from '@components/options/TextFieldWithDesc';
-import { GetGroupsType, UpdateField } from '@components/options/ToolOptions';
+import { UpdateField } from '@components/options/ToolOptions';
 import { InitialValuesType } from './types';
+import type { GenericCalcType } from './data/types';
+import type { DataTable } from 'datatables';
+import { getDataTable } from 'datatables';
 
 import nerdamer from 'nerdamer';
 import 'nerdamer/Algebra';
 import 'nerdamer/Solve';
 import 'nerdamer/Calculus';
 
-const ohmsLawCalc: {
-  name: string;
-  formula: string;
-  variables: {
-    name: string;
-    title: string;
-    unit: string;
-  }[];
-} = {
-  name: "Ohm's Law Calculator",
-  formula: 'V = I * R',
-  variables: [
-    {
-      name: 'V',
-      title: 'Voltage',
-      unit: 'V'
-    },
-    {
-      name: 'I',
-      title: 'Current',
-      unit: 'A'
-    },
-    {
-      name: 'R',
-      title: 'Resistance',
-      unit: 'Ω'
-    }
-  ]
-};
-
-export default function makeTool(): React.JSXElementConstructor<ToolComponentProps> {
+export default async function makeTool(
+  calcData: GenericCalcType
+): Promise<React.JSXElementConstructor<ToolComponentProps>> {
   const initialValues: InitialValuesType = {
     outputVariable: '',
-    vars: {}
+    vars: {},
+    presets: {}
   };
 
+  const dataTables: { [key: string]: DataTable } = {};
+
+  for (const selection of calcData.selections || []) {
+    dataTables[selection.source] = await getDataTable(selection.source);
+  }
+
   return function GenericCalc({ title }: ToolComponentProps) {
     const [result, setResult] = useState<string>('');
     const [shortResult, setShortResult] = useState<string>('');
 
+    // For UX purposes we need to track what vars are
+    const [valsBoundToPreset, setValsBoundToPreset] = useState<{
+      [key: string]: string;
+    }>({});
+
     const updateVarField = (
       name: string,
       value: number,
@@ -83,12 +71,89 @@ export default function makeTool(): React.JSXElementConstructor<ToolComponentPro
       updateFieldFunc('outputVariable', varName);
     };
 
+    const handleSelectedPresetChange = (
+      selection: string,
+      preset: string,
+      currentValues: InitialValuesType,
+      updateFieldFunc: UpdateField<InitialValuesType>
+    ) => {
+      const newValsBoundToPreset = { ...valsBoundToPreset };
+
+      const newPresets = { ...currentValues.presets };
+      newPresets[selection] = preset;
+      updateFieldFunc('presets', newPresets);
+
+      // Clear old selection
+      for (const key in valsBoundToPreset) {
+        if (valsBoundToPreset[key] === selection) {
+          delete newValsBoundToPreset[key];
+        }
+      }
+
+      const selectionData = calcData.selections?.find(
+        (sel) => sel.title === selection
+      );
+
+      if (preset != '<custom>') {
+        if (selectionData) {
+          for (const key in selectionData.bind) {
+            newValsBoundToPreset[key] = selection;
+            updateVarField(
+              key,
+              dataTables[selectionData.source].data[preset][
+                selectionData.bind[key]
+              ],
+              currentValues,
+              updateFieldFunc
+            );
+          }
+        } else {
+          setValsBoundToPreset(newValsBoundToPreset);
+          throw new Error(
+            `Preset "${preset}" is not valid for selection "${selection}"`
+          );
+        }
+      }
+
+      setValsBoundToPreset(newValsBoundToPreset);
+    };
+
+    calcData.variables.forEach((variable) => {
+      if (variable.default === undefined) {
+        initialValues.vars[variable.name] = {
+          value: NaN,
+          unit: variable.unit
+        };
+        initialValues.outputVariable = variable.name;
+      } else {
+        initialValues.vars[variable.name] = {
+          value: variable.default || 0,
+          unit: variable.unit
+        };
+      }
+    });
+
+    calcData.selections?.forEach((selection) => {
+      initialValues.presets[selection.title] = selection.default;
+      if (selection.default == '<custom>') return;
+      for (const key in selection.bind) {
+        initialValues.vars[key] = {
+          value:
+            dataTables[selection.source].data[selection.default][
+              selection.bind[key]
+            ],
+          unit: dataTables[selection.source].cols[selection.bind[key]].unit
+        };
+        valsBoundToPreset[key] = selection.default;
+      }
+    });
+
     return (
       <ToolContent
         title={title}
         inputComponent={null}
         resultComponent={
-          <ToolTextResult title={ohmsLawCalc.name} value={result} />
+          <ToolTextResult title={calcData.title} value={result} />
         }
         initialValues={initialValues}
         toolInfo={{
@@ -97,6 +162,50 @@ export default function makeTool(): React.JSXElementConstructor<ToolComponentPro
             'Common mathematical equations that can be used in calculations.'
         }}
         getGroups={({ values, updateField }) => [
+          {
+            title: 'Presets',
+            component: (
+              <Box>
+                <Table>
+                  <TableHead>
+                    <TableRow>
+                      <TableCell>Option</TableCell>
+                      <TableCell>Value</TableCell>
+                    </TableRow>
+                  </TableHead>
+                  <TableBody>
+                    {calcData.selections?.map((preset) => (
+                      <TableRow key={preset.title}>
+                        <TableCell>{preset.title}</TableCell>
+                        <TableCell>
+                          <Autocomplete
+                            disablePortal
+                            id="combo-box-demo"
+                            value={values.presets[preset.title]}
+                            options={Object.keys(
+                              dataTables[preset.source].data
+                            ).sort()}
+                            sx={{ width: 300 }}
+                            onChange={(event, newValue) => {
+                              handleSelectedPresetChange(
+                                preset.title,
+                                newValue || '',
+                                values,
+                                updateField
+                              );
+                            }}
+                            renderInput={(params) => (
+                              <TextField {...params} label="Preset" />
+                            )}
+                          ></Autocomplete>
+                        </TableCell>
+                      </TableRow>
+                    ))}
+                  </TableBody>
+                </Table>
+              </Box>
+            )
+          },
           {
             title: 'Input Variables',
             component: (
@@ -110,20 +219,23 @@ export default function makeTool(): React.JSXElementConstructor<ToolComponentPro
                   </TableRow>
                 </TableHead>
                 <TableBody>
-                  {ohmsLawCalc.variables.map((variable) => (
+                  {calcData.variables.map((variable) => (
                     <TableRow key={variable.name}>
                       <TableCell>{variable.name}</TableCell>
                       <TableCell>
                         <TextFieldWithDesc
                           title={variable.title}
                           sx={{ width: '25ch' }}
-                          description=""
+                          description={valsBoundToPreset[variable.name] || ''}
                           value={
                             values.outputVariable === variable.name
                               ? shortResult
                               : values.vars[variable.name]?.value || NaN
                           }
-                          disabled={values.outputVariable === variable.name}
+                          disabled={
+                            values.outputVariable === variable.name ||
+                            valsBoundToPreset[variable.name] !== undefined
+                          }
                           onOwnChange={(val) =>
                             updateVarField(
                               variable.name,
@@ -161,7 +273,7 @@ export default function makeTool(): React.JSXElementConstructor<ToolComponentPro
             setResult('Please select a solve for variable');
             return;
           }
-          let expr = nerdamer(ohmsLawCalc.formula);
+          let expr = nerdamer(calcData.formula);
 
           Object.keys(values.vars).forEach((key) => {
             if (key === values.outputVariable) return;
diff --git a/src/pages/tools/number/generic-calc/meta.ts b/src/pages/tools/number/generic-calc/meta.ts
index aff3a72..f095164 100644
--- a/src/pages/tools/number/generic-calc/meta.ts
+++ b/src/pages/tools/number/generic-calc/meta.ts
@@ -1,17 +1,32 @@
-import { defineTool } from '@tools/defineTool';
+import { DefinedTool, defineTool } from '@tools/defineTool';
 import { lazy } from 'react';
+import type { GenericCalcType } from './data/types';
+import allGenericCalcs from './data/index';
 
-async function importComponent() {
+async function importComponent(data: GenericCalcType) {
   const x = await import('./index');
-  return { default: x.default() };
+  return { default: await x.default(data) };
 }
-export const tool = defineTool('number', {
-  name: 'Generic calc',
-  path: 'generic-calc',
-  icon: '',
-  description: '',
-  shortDescription: '',
-  keywords: ['generic', 'calc'],
-  longDescription: '',
-  component: lazy(importComponent)
+
+const tools: DefinedTool[] = [];
+
+allGenericCalcs.forEach((x) => {
+  async function importComponent2() {
+    return await importComponent(x);
+  }
+
+  tools.push(
+    defineTool('number', {
+      name: x.title,
+      path: 'generic-calc/x.name',
+      icon: '',
+      description: '',
+      shortDescription: '',
+      keywords: ['generic', 'calc'],
+      longDescription: '',
+      component: lazy(importComponent2)
+    })
+  );
 });
+
+export { tools };
diff --git a/src/pages/tools/number/generic-calc/types.ts b/src/pages/tools/number/generic-calc/types.ts
index 8953230..28f6076 100644
--- a/src/pages/tools/number/generic-calc/types.ts
+++ b/src/pages/tools/number/generic-calc/types.ts
@@ -6,5 +6,9 @@ export type InitialValuesType = {
     };
   };
 
+  // Track preset selections
+  presets: {
+    [key: string]: string;
+  };
   outputVariable: string;
 };
diff --git a/src/pages/tools/number/index.ts b/src/pages/tools/number/index.ts
index c03df53..f26f6fe 100644
--- a/src/pages/tools/number/index.ts
+++ b/src/pages/tools/number/index.ts
@@ -1,10 +1,10 @@
 import { tool as numberSum } from './sum/meta';
 import { tool as numberGenerate } from './generate/meta';
 import { tool as numberArithmeticSequence } from './arithmetic-sequence/meta';
-import { tool as genericCalc } from './generic-calc/meta';
+import { tools as genericCalcTools } from './generic-calc/meta';
 export const numberTools = [
   numberSum,
   numberGenerate,
   numberArithmeticSequence,
-  genericCalc
+  ...genericCalcTools
 ];