Rex says
Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.
Try a scenario
Click to load — tweak from there.Inputs
Result
Family A weekly share
$416.67
Family B weekly share
$583.33
Flat base per family
$250.00
Add-on per child
$166.67
Total weekly wage
$1,000.00
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How to use this
- 1Enter nanny's total weekly wage ($).
- 2Enter number of families.
- 3Enter children — family a.
- 4Enter children — family b.
- 5Enter hours per week — family a.
- 6Enter hours per week — family b.
- 7Enter share of cost that's a flat per-family base (%).
- 8Read your family a weekly share on the right — it updates as you type.
- 9Hit Share to keep the scenario or send it to someone.
About this calculator
Nanny shares cut cost per family versus solo care, but splitting the bill fairly gets messy once families have different kid counts, different hours, or one family uses a spare bedroom for care. This calculator splits total weekly cost using a base rate per family plus a per-child add-on, which is the most common real-world structure — it avoids the trap of splitting straight down the middle when one family has one child and the other has three, or when hours differ significantly between families.
Worked example
Using the values the calculator loads with:
Inputs
- Nanny's total weekly wage: 1000 $
- Number of families: 2
- Children — Family A: 1
- Children — Family B: 2
- Hours per week — Family A: 45
- Hours per week — Family B: 45
- Share of cost that's a flat per-family base: 50 %
Results
- Family A weekly share: $416.67
- Family B weekly share: $583.33
- Flat base per family: $250.00
- Add-on per child: $166.67
- Total weekly wage: $1,000.00
What each field means
Inputs
- Nanny's total weekly wage ($)
- The nanny's total weekly wage used in the calculation, measured in $. Starts at 1000 $ so you have a working example on load.
- Number of families
- The number of families used in the calculation. Starts at 2 so you have a working example on load. Accepted range: 2–4.
- Children — Family A
- The children — family a used in the calculation. Starts at 1 so you have a working example on load. Accepted range: 1–5.
- Children — Family B
- The children — family b used in the calculation. Starts at 2 so you have a working example on load. Accepted range: 1–5.
- Hours per week — Family A
- The hours per week — family a used in the calculation. Starts at 45 so you have a working example on load.
- Hours per week — Family B
- The hours per week — family b used in the calculation. Starts at 45 so you have a working example on load.
- Share of cost that's a flat per-family base (%)
- The share of cost that's a flat per-family base used in the calculation, measured in %. Starts at 50 % so you have a working example on load. Accepted range: 0–100 %.
Results
- Family A weekly share
- Returned as a money amount in US dollars and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Family B weekly share
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Flat base per family
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Add-on per child
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Total weekly wage
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
Why not just split 50/50?
Straight 50/50 works only when both families have equal kids and equal hours. The moment one family adds a second child or uses fewer hours, a flat split either overcharges or undercharges — the base-plus-per-child model reflects that a nanny watching three kids works harder than watching one, without penalizing the smaller family for the whole gap.
Who's the legal employer in a nanny share?
Usually each family should be a co-employer with its own payroll and tax filing for its share of wages, or one family is the primary employer and the other pays them directly as a shared-cost arrangement. Get this in writing — the IRS doesn't recognize an informal split as two separate 'part-time' jobs automatically.
How do we handle sick days or when one family's kid is absent?
Most shares still pay the nanny full daily rate regardless of which kids show up, since she's on the clock either way. Build this expectation into the written agreement up front so nobody argues over a $40 day after the fact.
Accuracy and limitations
- Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
- Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
- This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Nanny Share Split Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/nanny-share-split
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/nanny-share-split" target="_blank" rel="noopener">Nanny Share Split Calculator — RevenueLab</a> (2026).</p>
Source: [Nanny Share Split Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/nanny-share-split) (2026).