Understanding retirement planning calculator
An expense-based retirement plan asks how much the portfolio must fund after work stops. Inflation raises the future expense budget, while retirement returns discount later spending back to the retirement date. Planning for more years raises the funding need even if your first-year spending stays the same.
Formula and calculation method
Inflate current expenses to retirement. Discount each future annual expense back to the retirement date, assuming the first annual expense is paid immediately. Required monthly savings = remaining retirement corpus need / end-of-month contribution accumulation factor.
All rates are illustrative, editable assumptions, not live quotations or guaranteed returns. Fees and taxes are excluded unless entered. Compare scenarios using the same contribution timing and return convention. This expense-based plan is distinct from the existing retirement growth calculator. It does not include pension income, tax, healthcare shocks, inheritance or uncertain lifespans.
How to use retirement planning calculator
- Set Current age. The example below uses 30.
- Set Retirement age. The example below uses 60.
- Set Age to plan through. The example below uses 85.
- Set Current monthly retirement expense budget. The example below uses 30000.
- Set Assumed annual expense inflation (%). The example below uses 5.
- Set Annual return during retirement (%). The example below uses 6.
- Set Existing retirement savings. The example below uses 100000.
- Set Annual savings return before retirement (%). The example below uses 8.
- Select Calculate to update the result. Reset restores the illustrated inputs. Copy, print or download your own result if you need a record.
Worked example
Example inputs
- Current age
- 30
- Retirement age
- 60
- Age to plan through
- 85
- Current monthly retirement expense budget
- 30000
- Assumed annual expense inflation (%)
- 5
- Annual return during retirement (%)
- 6
- Existing retirement savings
- 100000
- Annual savings return before retirement (%)
- 8
- Required retirement corpus
- 34,796,593.43926499
- Monthly expense at retirement
- 129,658.27125452
- Projected existing savings
- 1,006,265.68890735
- Monthly savings required
- 23,989.43144751
Factors affecting your result
All rates are illustrative, editable assumptions, not live quotations or guaranteed returns. Fees and taxes are excluded unless entered. Compare scenarios using the same contribution timing and return convention. This expense-based plan is distinct from the existing retirement growth calculator. It does not include pension income, tax, healthcare shocks, inheritance or uncertain lifespans.
Changing current age changes the scenario being evaluated. Adjust one input at a time when comparing results, keep a copy of the assumptions, and compare values using the same unit and period. A precise arithmetic result does not make an uncertain assumption precise.
Frequently asked questions
How does the retirement planning calculator work?
Inflate current expenses to retirement. Discount each future annual expense back to the retirement date, assuming the first annual expense is paid immediately. Required monthly savings = remaining retirement corpus need / end-of-month contribution accumulation factor.
What inputs does Retirement Planning Calculator need?
Enter current age, retirement age, age to plan through, current monthly retirement expense budget, assumed annual expense inflation (%), annual return during retirement (%), existing retirement savings, annual savings return before retirement (%). Read the unit labels; percentages are entered as ordinary percentages, not decimal fractions.
How should I interpret the retirement planning calculator result?
All rates are illustrative, editable assumptions, not live quotations or guaranteed returns. Fees and taxes are excluded unless entered. Compare scenarios using the same contribution timing and return convention. This expense-based plan is distinct from the existing retirement growth calculator. It does not include pension income, tax, healthcare shocks, inheritance or uncertain lifespans.
Are my retirement planning calculator inputs uploaded?
No. The calculation runs in this browser. Favorites, recent tool names, theme and formatting preferences may be saved locally, but calculation inputs are not sent to a calculation server or stored by this website. Shared links do not include entered values.
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