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Love & Relationships

Wedding Shared Budget Calculator

Project the shared fund month by month and compare it with the contingency-protected wedding target.

Target wedding budgetBudget contingency (%)Already savedPartner A monthly contributionPartner B monthly contributionConfirmed other contributionAnnual savings yield (%)Months until wedding

Budget including contingency-

Partners' combined monthly contribution-

Saved balance plus recurring partner contributions-

Partner fund plus confirmed other contribution-

Projected shortfall-

Projected surplus-

Combined monthly amount required-

Required minus planned partner contributions-

Partner A share of planned monthly funding-

Decision view

Cumulative wedding-fund curve and target band

Cumulative wedding-fund curve and target bandMonthly partner funding approaches the protected budget before confirmed outside funding is added once at the event horizon.

Exact scenario comparisonMonths until wedding changes while all other entered assumptions remain constant.

Months until wedding	Budget including contingency	Partners' combined monthly contribution	Saved balance plus recurring partner contributions	Partner fund plus confirmed other contribution	Projected shortfall	Projected surplus	Combined monthly amount required	Required minus planned partner contributions	Partner A share of planned monthly funding

Period-by-period detail

Monthly shared wedding-fund schedule

Each month compounds the prior partner fund, adds both partner contributions, and compares total confirmed funding with the protected budget.

How to use Wedding Shared Budget Calculator

Enter the wedding target, contingency, and current savings.
Enter both monthly contributions, confirmed other funding, yield, and months.
Inspect the cumulative curve and ending gap.

Calculator guide

Understanding Wedding Shared Budget Calculator

A shared wedding fund should keep protected budget, partner deposits, investment growth, and confirmed outside funding distinct.

Protect the budget Contingency raises the funding target once.

Combine partner deposits Both recurring contributions enter the same monthly projection.

Convert the yield The annual percentage is converted before compounding.

Project the partner fund Opening savings and recurring deposits grow separately.

Calculation method

How the calculation works

Protect the wedding budget with an explicit contingency, compound existing savings and partner deposits, and add confirmed outside funding only once. Protect the target with contingency, compound current savings and recurring deposits, add confirmed outside funding once, and measure the gap.

Detailed calculation process

Project the shared wedding fund to the event month

The default protects a $28,000 target by 10%, starts with $6,500, adds $650 and $500 monthly, includes $3,000 confirmed outside funding, and projects 16 months at 3.5% annually.

General formula: Protected = Budget(1+c/100)Monthly = A+Br = y/1200Fund_n = Saved(1+r)^n+Monthly((1+r)^n-1)/rTotalFunding = Fund_n+OtherGap = max(Protected-TotalFunding,0)Surplus = max(TotalFunding-Protected,0) Current savings and partner deposits compound in the fund. Confirmed outside funding is added once at the end and contingency protects the spending target.

What each symbol means

Budget, Protected Base and contingency-protected wedding budgets ($).

A, B Partner monthly contributions ($/month).

y, r Annual yield (%) and monthly decimal rate.

n Months until the wedding (months).

Other Confirmed outside contribution ($).

Gap, Surplus Projected shortfall or excess ($).

Worked substitution with the default inputs

1. Protect the budget Protected = 28,000(1+10/100) = $30,800 Contingency raises the funding target once.

2. Combine partner deposits Monthly = 650+500 = $1,150/month Both recurring contributions enter the same monthly projection.

3. Convert the yield r = 3.5/1200 = 0.002916667 per monthn = 16 The annual percentage is converted before compounding.

4. Project the partner fund Fund_16 = 6,500(1+r)^16+1,150((1+r)^16-1)/r = $25,618.09 Opening savings and recurring deposits grow separately.

5. Reconcile confirmed funding TotalFunding = 25,618.09+3,000 = $28,618.09Gap = 30,800-28,618.09 = $2,181.91 Confirmed outside funding is counted once.

The default reaches $28,618.09 against a $30,800 protected budget, leaving a $2,181.91 projected gap.

Purpose-built visual

Cumulative wedding-fund curve with target band

The monthly curve shows partner funding, the one-time outside contribution, and the protected target threshold.

Live The visual is regenerated from the current inputs.

Units Counts, money, force, concentration, mass, and percentages retain their stated units.

Check The plotted values reconcile to the displayed calculation.

Worked situations

Practical examples

The default protects a $28,000 target by 10%, starts with $6,500, adds $650 and $500 monthly, includes $3,000 confirmed outside funding, and projects 16 months at 3.5% annually.
The default reaches $28,618.09 against a $30,800 protected budget, leaving a $2,181.91 projected gap.

Better inputs

Useful tips

Change one input at a time and confirm that both the results and visual update.
Keep every input in the unit printed beside it.
Retain intermediate precision and round only the reported result.

Before relying on the result

Limitations and common mistakes

Unconfirmed gifts must not be treated as guaranteed.
Vendor changes, taxes, tips, refunds, and emergencies can change the target.
Investment yield is a projection and may be negative.

Reference

Key terms

Protected budget: Target budget including contingency.
Confirmed funding: Funds treated as available under the entered assumptions.
Funding gap: Protected budget minus projected total funding, floored at zero.

Important note

Calculated from the entered dates, budgets, or shared-planning values. The result supports discussion but cannot evaluate relationship quality, fairness, or personal preferences.

Frequently asked questions

Why add outside funding only once?

It is entered as a confirmed lump sum, not a monthly deposit.

Does the target include contingency?

Yes.

Can the model show a surplus?