Ounces to Grams: Quick Framework
1. Core Formula
g = oz × 28.349523125 (exact avoirdupois). Reverse: oz = g ÷ 28.349523125.
2. Flow
- Read numeric input (default 0 if blank).
- Multiply / divide by constant.
- Format: choose precision (4–7 dec) depending on use.
3. Sanity Checks
- Disallow negative weights unless explicitly for net change.
- Large values (>1e6 g) show in kg for readability (optional enhancement).
4. Shortcuts / Mental Math
- Approx: 1 oz ≈ 28 g (error ~1.25%).
- Quarter oz ≈ 7 g; Half ≈ 14 g; 4 oz ≈ 113 g.
- Divide grams by 30 for very rough oz estimate.
5. Pitfalls
- Troy ounce (31.1034768 g) NOT supported here.
- Fluid ounce is volume, ignore for weight.
- Excessive rounding early causes drift in chained sums.
6. Micro Examples
2 oz → 56.699 g
113 g → 3.985 oz
0.75 oz → 21.262 g
7. Mini FAQ
- Exact constant? 28.349523125 g.
- Troy metals? Use troy constant 31.1034768.
- Why many decimals? Prevent cumulative error; round only on output.
8. Action Tip
Keep one internal double (grams). When user swaps, recompute ounces from stored grams to avoid precision loss.