Present Population given Forecasted Population Calculator

✖Forecasted Population is the population forested usually after n decade or after n years.ⓘ Forecasted Population [P_n]			+10% -10%
✖Average Birth Rate Per Year is the arithmetic average of total births within a year.ⓘ Average Birth Rate Per Year [B.R.]			+10% -10%
✖Average Death Rate Per Year is the arithmetic mean of number of deaths within a year.ⓘ Average Death Rate Per Year [D.R.]			+10% -10%
✖Average Migration Rate per Year means moving within a state, country, or continent in a year. It can be positive or negative.ⓘ Average Migration Rate per Year [M.R.]			+10% -10%
✖Number of Years is the year for which the population is forecasted from the last known population.ⓘ Number of Years [N]			+10% -10%

✖Last Known Population is the population of any area of the previous year or decade.ⓘ Present Population given Forecasted Population [P_o]

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Formula

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Present Population given Forecasted Population

Formula

`"P"_{"o"} = "P"_{"n"}-("B.R."-"D.R."+"M.R.")*"N"`

Example

`"275000"="350000"-("10000/Year"-"5000/Year"+"2500/Year")*"10Year"`

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Present Population given Forecasted Population Solution

STEP 0: Pre-Calculation Summary

Formula Used

Last Known Population = Forecasted Population-(Average Birth Rate Per Year-Average Death Rate Per Year+Average Migration Rate per Year)*Number of Years
P_o = P_n-(B.R.-D.R.+M.R.)*N
This formula uses 6 Variables

Variables Used

Last Known Population - Last Known Population is the population of any area of the previous year or decade.
Forecasted Population - Forecasted Population is the population forested usually after n decade or after n years.
Average Birth Rate Per Year - (Measured in 1 Per Year) - Average Birth Rate Per Year is the arithmetic average of total births within a year.
Average Death Rate Per Year - (Measured in 1 Per Year) - Average Death Rate Per Year is the arithmetic mean of number of deaths within a year.
Average Migration Rate per Year - (Measured in 1 Per Year) - Average Migration Rate per Year means moving within a state, country, or continent in a year. It can be positive or negative.
Number of Years - (Measured in Year) - Number of Years is the year for which the population is forecasted from the last known population.

STEP 1: Convert Input(s) to Base Unit

Forecasted Population: 350000 --> No Conversion Required
Average Birth Rate Per Year: 10000 1 Per Year --> 10000 1 Per Year No Conversion Required
Average Death Rate Per Year: 5000 1 Per Year --> 5000 1 Per Year No Conversion Required
Average Migration Rate per Year: 2500 1 Per Year --> 2500 1 Per Year No Conversion Required
Number of Years: 10 Year --> 10 Year No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

P_o = P_n-(B.R.-D.R.+M.R.)*N --> 350000-(10000-5000+2500)*10

Evaluating ... ...

P_o = 275000

STEP 3: Convert Result to Output's Unit

275000 --> No Conversion Required

FINAL ANSWER

275000 <-- Last Known Population

(Calculation completed in 00.004 seconds)

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Created by Suraj Kumar

Birsa Institute of Technology (BIT), Sindri

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Verified by Ishita Goyal

Meerut Institute of Engineering and Technology (MIET), Meerut

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< 6 Growth Composition Analysis Method Calculators

Average Birth Rate Per Year given Future Population

Go Average Birth Rate Per Year = (Forecasted Population-Last Known Population)/Number of Years+Average Death Rate Per Year-Average Migration Rate per Year

Average Death Rate Per Year given Future Population

Go Average Death Rate Per Year = Average Birth Rate Per Year+Average Migration Rate per Year-(Forecasted Population-Last Known Population)/Number of Years

Future Population at End of n Year given Migration

Go Forecasted Population = Last Known Population+(Average Birth Rate Per Year-Average Death Rate Per Year+Average Migration Rate per Year)*Number of Years

Migration given Future Population at End of n Year

Go Average Migration Rate per Year = (Forecasted Population-Last Known Population)/Number of Years-Average Birth Rate Per Year+Average Death Rate Per Year

Present Population given Forecasted Population

Go Last Known Population = Forecasted Population-(Average Birth Rate Per Year-Average Death Rate Per Year+Average Migration Rate per Year)*Number of Years

Natural Increase given Design Period

Go Natural Increase = (Forecasted Population-Last Known Population)/Number of Years-Average Migration Rate per Year

Present Population given Forecasted Population Formula

Last Known Population = Forecasted Population-(Average Birth Rate Per Year-Average Death Rate Per Year+Average Migration Rate per Year)*Number of Years
P_o = P_n-(B.R.-D.R.+M.R.)*N

What is Population Forecasting and Methods Involved?

Population forecasting is defined as the method of determining the expected population for a particular design period of a water supply system with the help of the study and analysis of future events and available records.
Methods are
1. Arithmetic Increase Method
2. Geometric Increase Method
3. Incremental Increase Method
4. Decrease Growth Rate Method
5. Logistic Curve Method
6. Demographic Method
7. Simple Graphical Method
8. Comparative Graphical Method
9. Master Plan Method
10. Ratio Method

How to Calculate Present Population given Forecasted Population?

Present Population given Forecasted Population calculator uses Last Known Population = Forecasted Population-(Average Birth Rate Per Year-Average Death Rate Per Year+Average Migration Rate per Year)*Number of Years to calculate the Last Known Population, The Present Population given Forecasted Population formula is defined as the value of the present population when we have prior information on other parameters used. Last Known Population is denoted by P_o symbol.

How to calculate Present Population given Forecasted Population using this online calculator? To use this online calculator for Present Population given Forecasted Population, enter Forecasted Population (P_n), Average Birth Rate Per Year (B.R.), Average Death Rate Per Year (D.R.), Average Migration Rate per Year (M.R.) & Number of Years (N) and hit the calculate button. Here is how the Present Population given Forecasted Population calculation can be explained with given input values -> 275000 = 350000-(0.000316887385068114-0.000158443692534057+7.92218462670286E-05)*315569520.

FAQ

What is Present Population given Forecasted Population?

The Present Population given Forecasted Population formula is defined as the value of the present population when we have prior information on other parameters used and is represented as P_o = P_n-(B.R.-D.R.+M.R.)*N or Last Known Population = Forecasted Population-(Average Birth Rate Per Year-Average Death Rate Per Year+Average Migration Rate per Year)*Number of Years. Forecasted Population is the population forested usually after n decade or after n years, Average Birth Rate Per Year is the arithmetic average of total births within a year, Average Death Rate Per Year is the arithmetic mean of number of deaths within a year, Average Migration Rate per Year means moving within a state, country, or continent in a year. It can be positive or negative & Number of Years is the year for which the population is forecasted from the last known population.

How to calculate Present Population given Forecasted Population?

The Present Population given Forecasted Population formula is defined as the value of the present population when we have prior information on other parameters used is calculated using Last Known Population = Forecasted Population-(Average Birth Rate Per Year-Average Death Rate Per Year+Average Migration Rate per Year)*Number of Years. To calculate Present Population given Forecasted Population, you need Forecasted Population (P_n), Average Birth Rate Per Year (B.R.), Average Death Rate Per Year (D.R.), Average Migration Rate per Year (M.R.) & Number of Years (N). With our tool, you need to enter the respective value for Forecasted Population, Average Birth Rate Per Year, Average Death Rate Per Year, Average Migration Rate per Year & Number of Years and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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