SinkerCalc combines depth, tidal current, wind, rig type, and line type to recommend the exact oz — and updates it every hour as the tide shifts.
Live Calculation
Estimated weight for general guidance only. Actual conditions vary — always verify at the water.
The Algorithm
Features
See how your sinker weight changes over the next 24 hours as tide and current shift. Plan your session before you leave. (Pro)
Store depth, bottom type, and tide station for each fishing spot. Switch spots instantly and recalculate. (Pro)
Tide times, peak current speeds, best and worst windows for the week. Know which morning is worth waking up early for. (Pro)
Flounder drift? Grouper dead-stick? Species-specific presentation speed tweaks the final weight recommendation. (Pro)
Get notified when the tide turns so you know to re-check your sinker weight mid-session. (Pro)
API down? SinkerCalc uses your last cached tide data and shows a clear warning — it never crashes, never freezes.
How It Works
SinkerCalc finds the nearest NOAA tide station and pulls current speed automatically
Slide depth, pick your rig type, select line — takes 10 seconds
One number. The right sinker. Updated every hour as the tide changes.
Free to use. Pro features $4.99/month.
Download on the App Store