Use full-size pattern measurements to estimate a panel bounding area before planning purchases. Pattern layout, grain direction, breakage, sheet dimensions and offcuts may change the actual amount of glass you need.
Glass project planning worksheet
This calculator estimates panel area and a clearly labeled planning-only allowance. It does not tell you how much glass must be cut, and does not replace a full-scale pattern or measured template.
A pattern with many small shapes may create far more offcuts; compare your actual pattern, glass sheets, grain direction and cuts before ordering.
This is only an approximate planning range; do not assume it predicts individual sheet requirements.