Family Law Calculators

Free Ontario Family Law Calculators

Separation and divorce raise urgent money questions long before you ever speak to a lawyer: How much child support will I pay or receive? How is our property split? Could I owe spousal support, and for how long? Our free Ontario family law calculators are built to give you a fast, private, no-obligation estimate on all of these questions — using the same tables, formulas, and thresholds that Ontario courts and family lawyers rely on every day. There is nothing to download, no account to create, and nothing shared with anyone. You get a number and an explanation of how it was reached, so you can walk into your first consultation already understanding the ballpark.

Every tool on this page is tailored to Ontario law specifically — not a generic U.S. or national estimator. Child support figures come from the Federal Child Support Guidelinestables that apply in Ontario, spousal support ranges follow the Spousal Support Advisory Guidelines (SSAG), and property division reflects the equalization scheme under Ontario’s Family Law Act. That distinction matters, because the wrong calculator can leave you off by thousands of dollars a year.

What You Can Estimate

Child & Spousal Support

The Child & Spousal Support Calculator is the most-used tool here. It estimates monthly child support based on the paying parent’s income and the number of children, then layers in a spousal support range under the SSAG. Because support is rarely a single number, we also offer focused tools: the Spousal Support Duration Calculator estimates how long support may last (including the SSAG “rule of 65”), the Section 7 Special Expenses Calculator splits childcare, medical, and extracurricular costs proportionate to income, and the Retroactive Support Calculator estimates arrears when support wasn’t paid at the correct level in the past.

Parenting Time & Custody

Parenting arrangements directly affect support, so accurate time-sharing math is essential. The Parenting Time Percentage Calculator and the Custody Time Share Calculator let you compare common schedules or build your own to see the annual percentage split — and whether you cross the 40% shared-parenting threshold that changes how child support is calculated.

Property, Debt & the Matrimonial Home

When a relationship ends, married spouses in Ontario generally equalize the growth in their net worth. The Asset Division Calculator estimates the equalization payment, the Debt Division Calculator factors in what each spouse owes, and the Pension Division Calculator estimates the divisible share of a pension’s Family Law Value. If one spouse wants to keep the home, the Matrimonial Home Buyout Calculator estimates the payment required to do so.

Divorce Timing, Cost & Common-Law Rights

The Divorce Eligibility Calculator finds the earliest date you can be granted a divorce on the one-year separation ground, while the Divorce Cost Calculator estimates your likely total cost based on how much you and your spouse agree. Not married? The Common Law Rights Calculator checks whether you may qualify for spousal support or a property claim as a common-law partner — rights that differ significantly from those of married spouses in Ontario.

Why Use an Ontario-Specific Calculator

Family support in Ontario is driven by precise, published rules — but the inputs are where people go wrong. Income isn’t always your line 150 amount: bonuses, self-employment, and imputed income can all change the figure a court would use. Special expenses, the length of the relationship, and the parenting schedule each move spousal support up or down within a range rather than to a fixed number. Our calculators surface these factors so your estimate reflects the realities of an Ontario family court, not a one-size-fits-all guess.

• Built on Ontario & federal guidelines — the same tables lawyers and judges reference.
• 100% free and private — no sign-up, no payment, and your inputs stay on your device.
• Plain-language results — every estimate explains the formula behind the number.
• A smarter first meeting — arrive at your consultation already knowing the range.

How to Get the Most Accurate Estimate

A calculator is only as accurate as the numbers you feed it, so a few minutes of preparation pays off. Before you start, gather each spouse’s most recent income figure (line 15000 of your Notice of Assessment, plus any bonuses, commissions, or self-employment income), the number and ages of your children, and your current or proposed parenting schedule. For property tools, have rough values for the home, vehicles, savings, investments, pensions, and debts as of both the date of marriage and the date of separation — Ontario’s equalization scheme compares net worth between those two dates.

A common mistake is running only one calculator in isolation. Support, parenting time, and property division are interconnected: crossing the 40% shared-parenting threshold can change your child support, and the length of your relationship affects both the amount and duration of spousal support. Where your situation touches several of these areas, it’s worth running each relevant tool to see the full picture before you negotiate. If your income is straightforward and both spouses agree, your estimate will usually land close to the final figure; if income is disputed or complex, treat the result as a range and confirm it with a lawyer.

An Estimate Is a Starting Point, Not Legal Advice

These tools are designed to inform, not to replace advice from a lawyer. A calculator can’t weigh undisclosed income, judicial discretion, a spouse’s conduct, or the dozens of case-specific factors that shape a real order or separation agreement. The numbers you see are estimates to help you plan and ask better questions. When you’re ready to turn an estimate into an enforceable agreement or court order, our Ontario family lawyers can review your full financial picture and build a strategy around it — often starting with a free consultation.