Riichi Mahjong Score Calculator
Enter your hand details to calculate final points for ron or tsumo under standard riichi rules.
Note: House rules vary. This tool uses common JPML/Tenhou-style rounded scoring with limit hands (mangan and above).
Why a Riichi Mahjong Calculator Helps
Riichi mahjong scoring is elegant, but it can feel overwhelming at the table. Between han, fu, dealer adjustments, ron vs tsumo, honba counters, and riichi sticks, even experienced players sometimes pause to verify numbers. A fast calculator helps you check outcomes instantly, learn patterns, and improve confidence under time pressure.
More importantly, it helps with decision-making. If you know how much each hand is worth before you push, fold, or call, your strategy gets sharper. You stop playing by vague feeling and start playing by expected value.
How to Use This Calculator
- Han: Total han for the winning hand, including yaku and dora where relevant.
- Fu: Total fu before final rounding rules (except 25 fu special case).
- Win Type: Choose ron if you won off a discard, tsumo if self-drawn.
- Winner Seat: Dealer payouts differ from non-dealer payouts.
- Honba: Adds bonus points each continuation hand.
- Riichi Sticks: 1,000 points per stick awarded to the winner.
- Kiriage Mangan: Optional rule treating 3 han 60 fu and 4 han 30 fu as mangan.
Riichi Scoring Fundamentals (Quick Reference)
1) Base points
For non-limit hands, base points are calculated as:
Then payouts are derived from base points and rounded up to the nearest 100 points.
2) Limit hands
When hands reach higher han values, scoring jumps to fixed tiers:
- Mangan: base 2000
- Haneman: base 3000
- Baiman: base 4000
- Sanbaiman: base 6000
- Kazoe Yakuman: base 8000
3) Payout pattern by winner and win type
- Ron, non-dealer wins: discarder pays 4 × base (rounded).
- Ron, dealer wins: discarder pays 6 × base (rounded).
- Tsumo, non-dealer wins: dealer pays 2 × base, each non-dealer pays 1 × base (rounded separately).
- Tsumo, dealer wins: each opponent pays 2 × base (rounded).
Honba adds +300 on ron (paid by discarder), or +100 per paying player on tsumo.
Common Scoring Mistakes
- Forgetting to round payments up to the nearest 100.
- Confusing dealer and non-dealer win values.
- Missing honba additions, especially on tsumo splits.
- Using unrounded fu in final lookup intuition.
- Forgetting riichi stick payouts at hand end.
Practical Strategy Tip
Use quick score estimation to make better late-round choices:
- If your hand upgrades from 2 han to 3 han and crosses key thresholds, pushing can become justified.
- If your expected value gain is tiny but deal-in risk is high, folding is often correct.
- Understanding point pressure in South 4 can completely change your push/fold lines.
In short: scoring fluency is not just bookkeeping. It is strategy.
FAQ
Does this calculator support every house rule?
No calculator can cover all rule sets perfectly by default. This one targets mainstream riichi tournament/lobby scoring conventions, with optional kiriage mangan support.
What about multiple yakuman?
This calculator treats 13+ han as kazoe yakuman for practical use. Dedicated yakuman-multiplier logic can vary heavily by room and local rules.
Should I memorize all points anyway?
Yes. Use this as a training and verification tool. Over time, you should internalize the most common hands (30 fu 1–4 han, 40 fu 2–4 han, mangan lines, and dealer equivalents).