Retirement planning
Retirement contribution target
Calculate a monthly contribution needed for your chosen retirement target, using a stated nominal or today-money target and assumed growth.
Your inputs
Complete the fields for your selected method. Zero means intentionally zero, not unknown. Currency selection labels amounts; it does not convert exchange rates.
How this calculation works
monthly contribution = (future target - future value of existing savings) / contribution accumulation factor
A constant-rate arithmetic scenario, not a forecast or promised return. Supply your own return assumptions; example rates are not recommended investments. Monthly contributions are fixed nominal amounts, not automatically increased for inflation. No taxes, contribution limits, account eligibility, trading costs or benefits are inferred. Negative returns are supported; actual return sequences can differ materially. The target is supplied, not recommended. Selecting today-money target inflates it once to retirement; do not also inflate it before entering. No statutory contribution limits, account selection or tax advice is supplied.
What information do I need?
Use records for the same job, equipment or accounting period. Only the fields for your selected entry method are required. An unknown amount is not zero.
Input definitions and where to find them
- Current age (years): Your current whole age; no date of birth is collected.
- Chosen retirement age (years): Your chosen whole retirement age. This is a planning horizon, not an eligibility or retirement recommendation.
- Current retirement savings balance (selected currency): The balance already available at the start, not future contributions.
- Retirement savings target on selected basis (selected currency): The amount you want at the end, on the stated nominal or today-money basis.
- How is the target stated?: Use matching records or a clearly stated assumption for the indicated period. Prefilled figures are illustrative. An unknown value is not zero.
- Assumed effective annual return after investment fees (%): Supply an assumed annual rate on the selected basis. Use effective annual growth or APY unless you specifically have a nominal rate and compounding frequency. The example is not a current quote or forecast.
- Assumed annual inflation (%): Your assumed constant annual inflation rate. It changes purchasing-power comparisons only; this is not a live CPI lookup or prediction.
- When is each monthly contribution added?: Use matching records or a clearly stated assumption for the indicated period. Prefilled figures are illustrative. An unknown value is not zero.
Use the Where to find this value controls beside the inputs for available work-it-out helpers. Estimates remain your assumptions; a helper does not verify the source figures.
Worked example
Example amounts use US dollars (USD).
Example answer: Required monthly contribution under supplied assumptions is $1,021.23 for the illustrative inputs below.
Example inputs
- Current age: 35 years
- Chosen retirement age: 65 years
- Current retirement savings balance: $50,000.00
- Retirement savings target on selected basis: $500,000.00
- How is the target stated?: Today’s purchasing power
- Assumed effective annual return after investment fees: 5.00 %
- Assumed annual inflation: 2.50 %
- When is each monthly contribution added?: End of month
- Required monthly contribution under supplied assumptions
- $1,021.23
- Target amount at chosen retirement age
- $1,048,783.79
- Modeled final balance with that contribution
- $1,048,783.79
- Starting savings plus modeled contributions
- $417,642.95
- Target in today’s purchasing power
- $500,000.00
- Required contribution is solved without intermediate rounding; displayed cents can leave a small difference from the target. A zero requirement means the existing balance alone reaches the modeled future target.
These illustrative values are not recommended rates or industry averages. Replace every example input with your own figures.
Use the result well
Calculate a monthly contribution needed for your chosen retirement target, using a stated nominal or today-money target and assumed growth.
Keep inputs on the same scope and time basis. Calculations retain precision internally; displayed values generally round to two decimal places, with extra precision for very small values and whole-unit rounding where required. Economic comparisons describe your supplied assumptions and do not guarantee future results.
This tool provides business arithmetic. It does not approve engineering designs, establish legal or tax treatment, select equipment or certify safe operating conditions.