diff --git a/src/pages/tools/number/generic-calc/data/index.ts b/src/pages/tools/number/generic-calc/data/index.ts
index 1a700db..465a203 100644
--- a/src/pages/tools/number/generic-calc/data/index.ts
+++ b/src/pages/tools/number/generic-calc/data/index.ts
@@ -2,5 +2,11 @@ import ohmslaw from './ohmsLaw';
 import voltageDropInWire from './voltageDropInWire';
 import sphereArea from './sphereArea';
 import sphereVolume from './sphereVolume';
-
-export default [ohmslaw, voltageDropInWire, sphereArea, sphereVolume];
+import slackline from './slackline';
+export default [
+  ohmslaw,
+  voltageDropInWire,
+  sphereArea,
+  sphereVolume,
+  slackline
+];
diff --git a/src/pages/tools/number/generic-calc/data/slackline.ts b/src/pages/tools/number/generic-calc/data/slackline.ts
new file mode 100644
index 0000000..843a110
--- /dev/null
+++ b/src/pages/tools/number/generic-calc/data/slackline.ts
@@ -0,0 +1,49 @@
+import type { GenericCalcType } from './types';
+
+const slackline: GenericCalcType = {
+  icon: 'mdi:bridge',
+  keywords: [
+    'mechanical',
+    'rope',
+    'webbing',
+    'cord',
+    'string',
+    'tension',
+    'clothesline'
+  ],
+  shortDescription:
+    'Calculate the approximate tension of a slackline or clothesline. Do not rely on this for safety.',
+  name: 'Slackline Tension',
+  path: 'slackline-tension',
+  description: 'Calculates tension in a slackline',
+  longDescription: 'This calculator assumes a load in the center of the rope',
+  formula: 'T = (W * sqrt((S**2) + ((L/2)**2)) )/ (2S)',
+  presets: [],
+  variables: [
+    {
+      name: 'L',
+      title: 'Length',
+      unit: 'meter',
+      default: 2
+    },
+    {
+      name: 'W',
+      title: 'Weight',
+      unit: 'pound',
+      default: 1
+    },
+    {
+      name: 'S',
+      title: 'Sag/Deflection',
+      unit: 'meter',
+      default: 0.05
+    },
+    {
+      name: 'T',
+      title: 'Tension',
+      unit: 'pound-force'
+    }
+  ]
+};
+
+export default slackline;