Required Savings Rate Calculator
Calculate the monthly saving and income share needed for your goal, with your own nominal annual rate scenarios.
Required Savings Rate Calculator
Month-end contributions; n = 12 × years; i = annual % / 1200; F = (1 + i)^n; H = goal − saved × F; monthly = max(0,H) / ((F − 1) / i). At i = 0, divide max(0,goal − saved) by n. Growth = ending − saved − new paid. No inflation, taxes, fees or variable returns are modeled. Your rate is an assumption, not a forecast or recommendation.
Years must produce 1–120,000 whole months without rounding; annual rate must exceed −1200%. Enter 1–20 scenario rates. Income zero gives an undefined income share, even when contribution is zero.
All amounts use the entered currency. Display values are rounded; the report preserves unrounded values. Inputs stay in this browser.
- Monthly contribution
- —
- Annual income share (%)
- —
- New contributions paid
- —
- Projected ending balance
- —
- Growth or loss
- —
- Projected starting balance at horizon
- —
- Ending surplus above goal
- —
- Months
- —
- Monthly rate
- —
- Accumulation factor
- —
- Remaining goal after starting balance
- —
- Annuity factor
- —
| Yearly nominal rate (%) | Monthly contribution | Annual income share (%) | New contributions paid | Projected ending balance | Growth or loss | Projected starting balance at horizon | Ending surplus above goal |
|---|
A QUICK WALKTHROUGH
How to use this tool
- Years must produce 1–120,000 whole months without rounding; annual rate must exceed −1200%. Enter 1–20 scenario rates. Income zero gives an undefined income share, even when contribution is zero.
- All amounts use the entered currency. Display values are rounded; the report preserves unrounded values. Inputs stay in this browser.
- Month-end contributions; n = 12 × years; i = annual % / 1200; F = (1 + i)^n; H = goal − saved × F; monthly = max(0,H) / ((F − 1) / i). At i = 0, divide max(0,goal − saved) by n. Growth = ending − saved − new paid. No inflation, taxes, fees or variable returns are modeled. Your rate is an assumption, not a forecast or recommendation.
Required Savings Rate Calculator
Month-end contributions; n = 12 × years; i = annual % / 1200; F = (1 + i)^n; H = goal − saved × F; monthly = max(0,H) / ((F − 1) / i). At i = 0, divide max(0,goal − saved) by n. Growth = ending − saved − new paid. No inflation, taxes, fees or variable returns are modeled. Your rate is an assumption, not a forecast or recommendation.
Report (raw inputs and unrounded calculation)
All amounts use the entered currency. Display values are rounded; the report preserves unrounded values. Inputs stay in this browser.
GOOD TO KNOW
Common questions
How are existing savings treated?
The starting balance compounds at your chosen rate. Contributions are zero only when its horizon value covers the goal; a negative rate can create a future shortfall even when the goal is covered today.
Is the income share always available?
It is 100 × 12 × monthly contribution / annual income. With zero income the ratio is undefined. Use a consistent income basis; affordability is not assessed.
How should the rate be interpreted?
It is a user-entered nominal annual rate divided by 12, not an effective annual rate. Compare only your own assumptions; outcomes are not guaranteed.