Fishing Calculator Starter: Line Capacity and Battery Runtime

Fishing Calculator Starter

Two self-contained HTML tools for a fishing shop, club or content site: reel line capacity with backing estimates, and fish-finder battery runtime with a reserve estimate. Open index.html locally, or upload both HTML files to any static host. JavaScript must be enabled.

Included

• Line capacity: diameter-squared volume estimate, backing length, full-spool mode and invalid-input handling.
• Battery runtime: voltage, amp-hours, device/accessory draw, usable capacity and target trip duration. Reports nominal runtime, runtime after a 20% reserve, and required amp-hours before that reserve.
• Responsive styles and labeled inputs. No build step, package manager, third-party library, network request, analytics or backend.
• Source record identifying the existing TinyOps calculator pages used for this package.

Customization

Edit the inline CSS for colors and typography, the HTML for labels and navigation, and the inline JavaScript for calculation behavior. Keep the two HTML files together. The package can run inside an iframe; embedding and styling in a particular storefront platform are the buyer's responsibility.

Limits

These are planning estimates, not measured performance or equipment guarantees. Line packing and actual diameter affect reel capacity. Battery condition, discharge limits, temperature and varying loads affect runtime. Verify manufacturer specifications and actual equipment. The tools do not control equipment or recommend a battery installation.

No Troutmate domain, brand rights, accounts, audience, revenue, photos, articles, PDFs, sponsorship obligations or third-party assets are included. The public Troutmate demos contain additional imagery and commercial links which are absent from this package. No customer adoption or revenue is claimed for this starter.

License and support

Copyright 2026 TinyOps Studio LLC. This package is offered as a nonexclusive source license under the applicable Zero to Hundred marketplace purchase terms. It is not a transfer of the Troutmate business. Includes 30 days of written help opening and configuring the included files through the marketplace. Custom integrations and new features are not included.

Verification

Reference calculations and invalid-input cases were checked locally, and both pages were reviewed at desktop and 390px mobile widths. The marketplace marked dependency and build checks as not applicable because this package has no dependencies or build step. Generic marketplace install badges do not represent an installation test.