Pounds to Kilograms Converter

1. Core Formula

kg = lb × 0.45359237 (exact IEEE). Reverse: lb = kg ÷ 0.45359237.

2. Flow

1. Parse pounds (NaN→0).
2. Multiply by constant (keep 8+ decimals internally).
3. Render kg with chosen precision (2–5 dec).

3. Sanity Checks

• No negative unless representing loss/change.
• Huge values: consider scientific notation.

4. Shortcuts

• Approx: divide by 2.2.
• 10 lb ≈ 4.54 kg; 50 lb ≈ 22.68 kg.
• 2 lb ≈ 0.91 kg (almost 1 kg).

5. Pitfalls

• Rounding before swap → drift.
• Confusing mass vs body‑weight (force) contexts.

6. Micro Examples

1 lb → 0.45359237 kg

25 lb → 11.3398 kg

150 lb → 68.0389 kg

7. Mini FAQ

• Exact constant? 0.45359237.
• Fast estimate? lb ÷ 2.2.
• Precision needed? Use full constant then round once.

8. Action Tip

Store canonical pounds; regenerate kg and table rows on each input for consistency.