How to use the relative growth rate calculator
Find the relative growth rate of a plant or organism from two mass measurements. Enter initial dry mass, final dry mass, time interval in the fields above; the relative growth rate is computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “relative growth rate”, “RGR”, “growth rate per day”, “calculate relative growth rate”, “find relative growth rate”.
Formula
Variables
- W1 — Initial dry mass (g)
- W2 — Final dry mass (g)
- dt — Time interval (days)
Worked example
With initial dry mass = 0.5 g, final dry mass = 2 g, time interval = 10 days, the calculator gives relative growth rate ≈ 0.1386294 per day.
Frequently asked questions
What is the relative growth rate calculator used for?
Find the relative growth rate of a plant or organism from two mass measurements. It helps with questions such as “relative growth rate”, “RGR”, “growth rate per day”.
What is the formula for the relative growth rate calculation?
Relative growth rate (per day) = (ln(W2)-ln(W1)) / dt. Here W1 is initial dry mass (g), W2 is final dry mass (g), dt is time interval (days).
What inputs do I need for the relative growth rate calculator?
You need initial dry mass in g, final dry mass in g, time interval in days. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the relative growth rate calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the relative growth rate result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.