Japanese carpentry cut-list planner
Plan stock purchases and cuts using shaku, sun, bu, ken, or metric lengths, with quantities and saw kerf. Drag the graph handles to change inputs and explore the result.
Your inputs
The editable example is illustrative. Enter your own dimensions, operating data, prices, and fees. Results update as you edit.
Calculations run in your browser. Inputs are not saved or sent to analytics.
How it works
- Total finished length = Σ ( × )
- Material cost = Stock pieces required ×
- Material yield = Total finished length ÷ (Stock pieces required × ) × 100
- Worked example: Cut two 1,000 mm pieces from 2,400 mm stock with a 3 mm kerf per piece. One stock piece is sufficient; its price is the material cost.
- Offcuts = 2,400 − 2 × (1,000 + 3) = 394 mm; Material yield = 2,000 ÷ 2,400 × 100 ≈ 83.33%.
Input and formula key
Your result
Complete the inputs to see your result.
Assumptions and limitations
One shaku is 10/33 metre; one sun is 1/10 shaku and one bu is 1/100 shaku. Set shaku per ken explicitly because building modules vary. All entered lengths use the chosen unit; kerf is always millimetres. The output is a one-dimensional stock-cutting estimate, not a structural design or a legal trade measurement.
Sources
- National Diet Library — historical shaku definition Sources reviewed: 2026-10-05
- METI — measurement administration and traditional units Sources reviewed: 2026-10-05
