Fishing Calculators
Free fishing calculators.
Estimate fish weight, line strength, lure depth, and more.
Fish Weight from Length Calculator
Estimate fish weight from length and girth measurements. Useful for catch-and-release fishing without a scale. Works for bass, trout, pike, and more.
Fishing Line Strength and Knot Calculator
Calculate effective fishing line strength after knot loss. Most fishing knots reduce line strength by 15-30%. Find the right line test for your target fish.
Fly Fishing Tippet Size Calculator
Match tippet X-size to fly hook size and breaking strength. The rule of 3 and rule of 4 explained. Essential for fly fishing leader selection.
Lure Trolling Depth Calculator
Estimate how deep a lure runs when trolling based on line diameter, trolling speed, and amount of line out. Plan your trolling presentation.
Moon Phase Fishing Activity Calculator
Calculate fishing activity score based on moon phase and solunar theory. Find the best fishing times using major and minor solunar periods.