Interactive ToolHigh Precision

Average Weight Calculator (Mean, Median & Sample Mass)

Calculate the mean average, median, and total sum for any list of weights in kg, lbs or grams. Free statistical mass calculator with step-by-step math.

Interactive Math Tool
Formula: Average (Mean) = (W1 + W2 + ... + Wn) ÷ n
Separate measurements by commas or spaces (e.g. 72.5, 74, 80).
Calculated Result:74.80 kg (Mean)
Sample count: 5 weights • Total mass: 374.00 kg • Median: 75.00 kg

Formula & Mathematical Method

Average (Mean) = (W1 + W2 + ... + Wn) ÷ n

Sums all entered weight entries and divides by the total number of items to find the central tendency.

Worked Real-World Example

Weights of 70 kg, 75 kg, and 80 kg produce an average of (70 + 75 + 80) / 3 = 75 kg.

Step-by-Step Worked Examples

Example 1: Weekly Weigh-in Rolling Average

Problem: Daily morning weigh-ins: 74.2, 74.8, 74.0, 74.5, 73.9, 74.1, 74.3 kg. Find the weekly average.

(74.2 + 74.8 + 74.0 + 74.5 + 73.9 + 74.1 + 74.3) ÷ 7

Solution: Total mass = 519.80 kg. Weekly rolling mean average is 74.26 kg (median is 74.20 kg).

Example 2: Shipping Parcel Average Weight

Problem: 5 boxes weigh 12, 18, 15, 22, and 16 lbs. What is the average box weight?

(12 + 18 + 15 + 22 + 16) ÷ 5 = 83 ÷ 5

Solution: Average package weight is 16.60 lbs. Total shipment cargo weight is 83.00 lbs.

Example 3: Sporting Team Average Mass

Problem: Rowing team crew weights: 82, 85, 79, 86 kg.

(82 + 85 + 79 + 86) ÷ 4 = 332 ÷ 4

Solution: Mean crew weight is 83.00 kg (182.98 lbs).

Conversion factors follow the 1959 International Yard and Pound Agreement and NIST SP 811. Learn more in our methodology or view authoritative records at BIPM SI Brochure, NIST SP 811, and NPL Metrology.

Measurement Standards & Accuracy

Standard Multipliers

Factors based on the 1959 International Yard and Pound Agreement and NIST SP 811.

Sources
  • IEEE 754 Floating-Point Standard
  • NIST SP 811 Metrology
  • International Calculation Method
Accuracy & Policy
Standard Exact Multipliers (e.g., 1 lb = 0.45359237 kg)
Reviewed: October 2026 • About our methodology →

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Unit Encyclopedia

Kilogram (kg) StandardThe kilogram is the primary unit of mass in the International System of Units (SI).
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Gram (g) StandardThe gram is a fundamental metric unit of mass equal to one one-thousandth of a kilogram (10⁻³ kg).
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Milligram (mg) StandardA milligram is equal to 1/1,000 of a gram and 1/1,000,000 of a kilogram.
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Average Weight — FAQs

Add all individual weight values together and divide by the total number of items: Mean = (W1 + W2 + ... + Wn) / n.

The mean is the mathematical average (sum divided by count). The median is the middle value when all weights are sorted in order, which helps filter out extreme outliers.

Daily body weight fluctuates by 1 to 2 kg due to hydration, sodium intake, and digestive waste. A 7-day rolling average provides accurate visibility of real fat or muscle changes.