Calculate growth velocity and periodic performance metrics.
Days
Weeks
Months
Years
1 Decimal
2 Decimals
3 Decimals
Results
Total Increase:
0.00
Understanding Rate of Gain
The Rate of Gain (ROG) is a metric used to measure the speed at which a specific variable increases over a set period. While commonly used in agriculture (Average Daily Gain for livestock), it is equally applicable to weightlifting progress, business production output, and general biological growth tracking.
The Rate of Gain Formula
To determine the rate of gain, you subtract the starting value from the ending value and divide that result by the total time elapsed:
Rate of Gain = (Final Value – Initial Value) / Time
Why Track Rate of Gain?
Livestock Management: Monitoring "Average Daily Gain" (ADG) to ensure animals are meeting growth targets.
Fitness & Bodybuilding: Tracking weekly muscle mass increases or strength gains.
Business Operations: Measuring the increase in production units per hour or day.
Botany: Calculating the growth rate of plants or crops per week.
Practical Examples
Scenario
Calculation
Result
Livestock (Lbs)
(800 – 500) / 100 Days
3.0 lbs/day
Plant Growth (cm)
(15 – 5) / 2 Weeks
5.0 cm/week
Inventory Units
(1000 – 200) / 8 Hours
100 units/hour
How to use this calculator
1. Initial Value: Enter the number you started with at the beginning of the period.
2. Final Value: Enter the current number or the number at the end of the period.
3. Time Elapsed: Enter the total duration between the two measurements.
4. Time Unit: Select whether that duration represents days, weeks, months, or years.
5. Measurement Unit: Type the label for what you are measuring (e.g., kg, lbs, cm, units).
function calculateRateOfGain() {
var initial = parseFloat(document.getElementById('initialValue').value);
var final = parseFloat(document.getElementById('finalValue').value);
var time = parseFloat(document.getElementById('timeDuration').value);
var unit = document.getElementById('measurementUnit').value || "units";
var timeLabel = document.getElementById('timeUnit').value;
var decimals = parseInt(document.getElementById('decimalPlaces').value);
var resultBox = document.getElementById('rogResult');
var rateDisplay = document.getElementById('rateDisplay');
var totalLabel = document.getElementById('totalChangeLabel');
var interpretation = document.getElementById('interpretationText');
if (isNaN(initial) || isNaN(final) || isNaN(time) || time Day)
var singularTime = timeLabel.slice(0, -1);
if (timeLabel === "Months") singularTime = "Month";
rateDisplay.innerHTML = rate.toFixed(decimals) + " " + unit + " / " + singularTime;
totalLabel.innerHTML = "Total Change: " + totalChange.toFixed(decimals) + " " + unit + "";
var trend = totalChange >= 0 ? "gain" : "loss";
interpretation.innerHTML = "This indicates an average " + trend + " of " + Math.abs(rate).toFixed(decimals) + " " + unit + " for every " + singularTime.toLowerCase() + " elapsed.";
resultBox.style.display = "block";
resultBox.scrollIntoView({ behavior: 'smooth', block: 'nearest' });
}