Milligrams ➝ Kilograms: Fast, Exact, Reliable
1. Core Formula
kg = mg ÷ 1,000,000 (exact). Reverse: mg = kg × 1,000,000. Also: g = mg ÷ 1000.
2. Flow
- Input milligrams.
- Divide by 1,000,000 → kilograms.
- Round for display only.
- Cross-check: 1,000,000 mg = 1 kg.
3. Sanity Checks
- 1 mg = 0.000001 kg
- 100,000 mg = 0.1 kg
- 500,000 mg = 0.5 kg
- 1,000,000 mg = 1 kg
4. Shortcuts
- Shift decimal six places left for mg → kg.
- Keep integers in mg for exactness; convert at the edge.
- Use locale formatting for readability.
5. Pitfalls
- Avoid early rounding in chained conversions.
- Don’t mix up mg/g/kg labels.
- Beware scientific notation display in UIs.
6. Micro Examples
100,000 mg
= 0.1 kg
250,000 mg
= 0.25 kg
500,000 mg
= 0.5 kg
1,000,000 mg
= 1 kg
7. Mini FAQ
- Exact factor? 1 kg = 1,000,000 mg.
- Decimals? Show 3–6 dp for kg; fewer for summaries.
- Storage? Prefer integers in mg to avoid float drift.
8. Action Tip
When dealing with very large mg values, convert to kg only when displaying; keep calculations in integers (mg) for accuracy and speed.