Fly Tying Calculators
Free fly tying calculators for hook sizing, material weight, thread coverage, and pattern scaling.
Essential tools for fly fishers and tiers.
Fly-Tying Cost Per Fly Calculator
Estimate the materials cost of a single tied fly. Add hook cost plus prorated material costs (thread, hackle, dubbing) to see your true per-fly investment.
Fly-Tying Hackle Size by Hook
Get the recommended hackle feather length for any standard dry fly hook size. Includes both barb length range and gape multiplier rule of thumb.
Fly Tying Bead Head Size Guide
Match tungsten or brass bead head size to your hook size. Get recommended bead diameter, bead weight, and approximate sink rate improvement.
Fly Tying Thread Wraps Per Inch Calculator
Calculate how many thread wraps cover one inch of fly hook shank by thread denier. Enter thread size and hook length to estimate total wraps needed.
Fly-Tying Proportions Calculator
Calculate standard fly-tying proportions from shank length and gap width. Get tail, body, wing, and hackle dimensions for dry flies, nymphs, and more.
Tippet X-Rating to Pound Test Calculator
Convert tippet X-rating (0X to 8X) to pound test, diameter in mm and inches, and matching fly hook size. Standard fly fishing reference.
Fly Tying Hook Size Calculator
Find the right hook size for any fly pattern from target species and fly type. Covers dry, wet, nymph, streamer, and saltwater hooks with gap guidance.
Fly Tying Material Weight Calculator
Calculate material weights in milligrams and grains for fly tying to hit target sink rate. Returns balanced weights for nymph, streamer, and dry fly patterns.