Missionary Support Goal & Funding Gap Calculator
Turn a ministry budget into a monthly support target, remaining recurring gap, additional supporters needed and one-time launch-funding pace.
Direct answer
Monthly support and one-time launch needs are different funding problems. This calculator keeps them separate, then shows the recurring gap and the pace needed to close one-time needs before departure.
Calculate the support goal
Privacy: This calculation runs in your browser. The figures you enter are not submitted to our server.
Why this matters
Mission organizations such as SIM USA describe support budgets as individualized around cost of living, family size, ministry expenses and other recurring and one-time needs. A useful calculator therefore should not invent a standard missionary salary or universal fundraising goal.
Formula and assumptions
Additional supporters needed = recurring gap ÷ average monthly gift, rounded up to a whole supporter. One-time needs are calculated separately. When months until departure are entered, the calculator also shows the average monthly pace needed to close the one-time gap before the target date.
Important limits
- The calculator does not replace an approved budget from a sending organization.
- Taxes, insurance, retirement, agency fees, visas, travel, education and cost-of-living treatment vary by missionary, country and organization.
- The payment/currency-loss allowance is user-entered; the tool does not assume a universal FX or transfer-loss rate.
- “Supporters needed” is a planning count based on the average gift entered, not a prediction of fundraising success.
Authoritative references
- SIM USA: How Much Money Do I Need to Raise to be a Missionary?
- SIM USA: Do I Need to Raise My Own Support Funds to Become a Missionary?
Sources last verified: September 8, 2026.
What to do next
- Reconcile the result to the sending agency’s approved recurring and one-time budget.
- Separate committed recurring partners from verbal interest or one-time gifts.
- Track the monthly support gap and one-time launch gap independently so one does not hide the other.
Frequently asked questions
How is the missionary support goal calculated?
The calculator totals the recurring monthly needs entered, then grosses that amount up for any entered payment or currency-loss allowance. It does not decide what a mission agency should require.
How many supporters do I need?
The calculator divides the remaining monthly recurring gap by the average monthly supporter amount entered and rounds up to the next whole supporter.
Does the calculator include one-time expenses?
Yes. One-time launch needs and one-time funds already raised are tracked separately from recurring monthly support.
Why keep monthly support and one-time launch needs separate?
They solve different cash problems. A recurring monthly gap continues after departure, while a one-time need may be fully funded once.
Does this account for every country or mission agency?
No. Cost of living, family size, ministry costs, agency policies, taxes, insurance and currency conditions vary. Use the calculator to organize a planning target, then reconcile it to the sending organization’s approved budget.