Weight Calculator
Adjust the inputs below. Results update as you type.
How it works
1 kg = 2.20462 lb. 1 lb = 16 oz = 0.453592 kg. 1 stone = 14 lb (UK body weight measure). 1 short ton = 2,000 lb. 1 metric tonne = 1,000 kg = 2,204.6 lb. 1 troy pound = 12 troy oz (precious metals). Weight and mass are often used interchangeably in everyday language, but technically weight is force (mass × gravity) while mass is the amount of matter.
Input guidance
- Confirm date/time/unit settings before comparing outputs.
- If a task has optional fields, run both with and without them to understand impact.
- Save scenario variants when making practical decisions.
The formula
Weight = mass × gravitational acceleration (W = m·g). On Earth g ≈ 9.81 m/s², so a 1 kg mass weighs about 9.81 newtons.
Worked example
A 70 kg person weighs 70 × 9.81 ≈ 687 newtons on Earth, but only about 114 newtons on the Moon.
More examples to test
- Quick-pass example: run default assumptions for a first estimate.
- Refined example: update one assumption at a time to isolate impact.
How to interpret results
Use outputs as operational estimates and pair them with local constraints, business rules, or provider requirements.
When this can be inaccurate
Utilities can miss local policy details, special-case rules, and environment-specific constraints.
Change history
- July 2026: Quality-reviewed for publication with formula checks and explanatory copy updates.
Site-wide corrections also appear on the corrections log.
Find productivity tools for everyday workflows
General recommendation, not professional advice.
Frequently asked questions
Is weight the same everywhere?+
No. Weight depends on gravity, so the same mass weighs less on the Moon or Mars than on Earth, even though its mass is unchanged.
Why do scales show kilograms?+
Everyday scales display mass in kilograms by assuming Earth's gravity, converting the measured force into the equivalent mass.
What is the unit of weight?+
As a force, weight is measured in newtons (SI) or pounds-force, distinct from mass units like kilograms.
Why are outputs slightly different from another tool?+
Different tools can use different rounding rules, default assumptions, and treatment of edge cases.
How can I improve estimate reliability?+
Use verified inputs from real records and re-run calculations after major assumption changes.