How to use the population change rate calculator
Compute net growth from births, deaths and migration. Enter population, births per year, deaths per year, net migration per year in the fields above; the net change per year, growth rate, population next year are computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- N — Population
- b — Births per year
- d — Deaths per year
- im — Net migration per year
Worked example
With population = 10000, births per year = 150, deaths per year = 90, net migration per year = 20, the calculator gives net change per year ≈ 80; growth rate ≈ 0.8 %; population next year ≈ 10,080.
Frequently asked questions
What is the formula for the population change rate calculation?
Net change per year = b-d+im. Growth rate (%) = 100 × [Net change per year] / N. Population next year = N+[Net change per year]. Here N is population, b is births per year, d is deaths per year, im is net migration per year.
What inputs do I need for the population change rate calculator?
You need population, births per year, deaths per year, net migration per year. 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 this 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 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.