Tsuria is an Android app that answers the number questions of fishing: what a #1.5 Japanese line is in lb, how many grams 3/8 oz is, and how tight to set your drag. Convert line sizes, pounds and diameter, sinker sizes, grams and ounces, and work out drag, reel retrieve, line capacity, leader balance, hiro to feet, squid jig sizes and lead strip weight. Fixed numbers and estimates are kept separate; numbers that vary by maker are shown as a range. Save up to 30 tackle setups, log up to 100 catches with photos, and watch your personal bests per species build automatically. Made and published by GRAMSHIFT.
What you can do with Tsuria
Japanese line sizes to lb and mm
Convert gou sizes, pounds and diameter (mm) for nylon, fluorocarbon, ester and PE braid. PE runs from #0.1 to #30, with denier and a strength guide in lb and kg.
Squid jig (egi) size, length and weight
Egi sizes are in Japanese sun, so length is almost exactly size × 3 cm. Weight varies by maker, so it is shown as a range.
Catch log and personal bests
Log each catch with a photo, date, species, length, weight, spot and notes (up to 100), and link the tackle you used. Personal bests per species build automatically, and any catch becomes a share card.
From question to catch
- Pick a tool. Open the line converter, sinker & lure weight, drag setting, reel retrieve, line capacity, egi converter or another tool.
- Enter your numbers. Type a line size, lb, grams, ounces or gear ratio and get the answer right away. Ounces work as fractions like 1/32 or 3/8.
- Save and share. Keep your favorite setups in My tackle and log each catch. Turn a catch into a card image and share it to social media or friends.
Free and Remove ads
- Free: every converter, your catch log, photos and saved tackle, with nothing to buy. A small banner ad sits at the top of the screen (no full-screen ads).
- Watch one video and the top ad, space and all, is gone for 60 minutes.
- Remove ads (one-time purchase): removes the top ad for good. Only the ads go away. No subscription.
- The numbers, catch log and photos you enter are saved on your device. No account.
Frequently asked questions
How do I convert Japanese PE line sizes to lb?
Open the line converter and enter the size. Tsuria converts between gou sizes, pounds and diameter (mm), and shows strength as a range across makers because strength is not standardized.
How many grams is a 3/8 oz sinker?
Enter 3/8 oz in the sinker & lure weight tool and Tsuria converts it to grams and Japanese sinker sizes. Fractions like 1/32 or 3/8 oz are understood.
How tight should I set my drag?
A widely used rule of thumb is 1/4 to 1/3 of your line's rated strength. Enter the rating in lb or kg and Tsuria calculates the drag in kg and g.
Can I calculate line retrieved per handle turn?
Yes. Enter the gear ratio and spool diameter to get cm per handle turn, plus how many turns it takes to bring in a given distance.
How much line will my spool hold in a different size?
Enter a rating like "#3 × 150 m" and the size you want to spool. Tsuria converts exactly by size ratio, or estimates by diameter across materials like PE and nylon.
What size is a #3.5 squid jig in cm?
Egi sizes are in Japanese sun, so length is almost exactly size × 3 cm, about 10.5 cm for #3.5. Weight varies by maker and is shown as a range.
Can I log my catches and share them?
Yes. Log up to 100 catches with a photo, date, species, length, weight, spot and notes, and turn any catch into a card image to share. Personal bests per species build automatically.
Do I need an account?
No. Open the app and start converting right away, with no sign-up.
Good to know
- Line strength figures are guides based on a range of makers. Always trust the product label.
- Drag values follow the common 1/4–1/3 rule of thumb. A spring scale check is recommended for big fish.
- Line capacity and retrieve are geometric approximations.
- Hiro and yabiki come from body proportions, so they are shown as a range.
If something does not work, or you have an idea or a request, feel free to write to us through the contact form or at contact