19 July 2026
Ontario Small Claims Court deadlines
How days are counted, how service is deemed, and what happens when a Defence is filed late.
Read guideOntario calculators and guides. Informational only.
Ontario legal calculations, explained step by step.
Calculate selected Ontario court, tenancy and legal-invoice amounts with transparent methodologies, clearly separated assumptions, and links to the official statutes, regulations and court or tribunal sources behind each rule.
Start with an Ontario legal task
The Ontario calculators are grouped by the situation they belong to. Each group notes what the tools in it can work out and what remains a matter for the court, the tribunal or a licensed legal professional.
Small Claims Court
Work out what a claim is worth for jurisdiction purposes, what the court charges, when a step is due, what costs a party might ask for, and how much of a wage or account is exposed to enforcement.
What these tools can work out: These tools can apply published monetary limits, the fee schedule under O. Reg. 332/16, the day-counting rules in the Rules of the Small Claims Court, the 15 per cent costs ceiling in section 29 of the Courts of Justice Act, and the exemption percentages in the Wages Act.
What they cannot decide: They cannot tell you whether your claim will succeed, whether a limitation period has expired outside the rule-based presets, what a judge or deputy judge will actually award, or whether Small Claims Court is the right forum for your dispute.
Landlord and tenant
Build a rent ledger, convert monthly rent into a daily figure for the period after a tenancy ends, and check whether a proposed rent increase fits the guideline and notice rules.
What these tools can work out: These tools can charge rent period by period, credit a rent deposit and payments in date order, produce daily amounts for part months, and apply the published Ontario rent increase guideline together with the 12-month and 90-day notice rules.
What they cannot decide: They cannot decide whether a tenancy was validly terminated, whether an above-guideline increase should be approved, what the Landlord and Tenant Board will order, or which application form fits your situation.
Interest and legal invoices
Calculate interest on an Ontario order and check the arithmetic on a legal account, including how HST is applied to fees and to different kinds of disbursements.
What these tools can work out: These tools can apply the quarterly prejudgment and postjudgment rates published under the Courts of Justice Act, calculate simple interest across rate periods, and separate fees, taxable disbursements and pass-through agency disbursements before applying HST.
What they cannot decide: They cannot decide whether interest is payable at a contractual rate, whether a discretionary adjustment applies, whether a particular disbursement was properly incurred, or whether an account is reasonable on an assessment.
How the calculators are built and reviewed
The same working method applies across the Ontario tools, so a result can be checked by hand rather than taken on trust.
Deterministic calculations
The same inputs always produce the same output. Nothing is estimated by a model, and each calculation runs in your browser.
Methodology and worked examples
Every calculator page sets out the method it follows and works through examples with the arithmetic shown line by line.
Rules kept apart from assumptions
Pages distinguish what a statute, regulation or rule fixes from what the tool assumes on your behalf, so you can change an assumption knowingly.
Official sources cited
Rates, fees, limits and time periods are linked to the statute, regulation, court or tribunal page they come from.
Source dates and corrections
Pages carry the date their legal statements were last checked against those sources. Corrections can be sent through the feedback form and are reviewed.
Limitations stated plainly
Where a tool cannot resolve something, it says so and asks you to verify the result independently before relying on it.
Content is prepared and maintained by the operator of this independent site. No guarantee of accuracy or completeness is offered, and no professional review or certification is implied. Read the editorial policy or report an error through feedback and corrections.
What these tools cannot do
The calculators are arithmetic and rule-counting aids. They do not stand in for advice about your own matter.
- They do not give legal advice or create a lawyer-client or paralegal-client relationship.
- They do not run a conflict check and they do not know anything about the parties involved.
- They do not analyse limitation periods, except where you select a specific rule-based preset in the deadline calculator.
- They do not determine entitlement on the facts, such as whether a debt is owed or a tenancy was validly ended.
- They do not predict what a court or tribunal will decide or award.
Frequently used Ontario calculators
A selection of the tools people reach for most often. The full list, including the remaining Small Claims Court tools, is on the calculators index.
Ontario Court Interest Calculator
Applies the quarterly prejudgment and postjudgment rates across each rate period and shows the interest accrued on every segment.
Open this calculatorOntario Rent Arrears Calculator
Charges rent period by period, credits the deposit and payments in date order, and produces a daily figure for part periods.
Open this calculatorSmall Claims Court Deadline Calculator
Counts days under the Rules of the Small Claims Court, skipping holidays and applying the service-deeming rules to the selected step.
Open this calculatorSmall Claims Court Fee Calculator
Totals filing and step fees from the current schedule, using the frequent-claimant rates where they apply.
Open this calculatorLegal Fees and HST Calculator
Separates fees, taxable disbursements and agency disbursements, then applies HST only where the account is taxable.
Open this calculatorOntario Rent Increase Calculator
Checks a proposed increase against the published guideline, the 12-month rule and the 90-day notice requirement.
Open this calculator Guides
Recommended Ontario guides
19 July 2026
How to calculate Ontario rent arrears
Charging rent, crediting the deposit, and converting monthly rent into daily compensation.
Read guide19 July 2026
HST on legal fees and disbursements
The agency principle: which disbursements pass through untaxed and which are re-billed with HST.
Read guideSecondary collection
Canadian law student tools
Separate from the Ontario calculator collection, this section offers Canada-wide educational and organisational support for law students: worksheets and formatting helpers for coursework, research and moot preparation. The tools are independent and are not affiliated with, endorsed by, or connected to any university, publisher, court or citation-guide publisher. They reproduce no proprietary citation-guide text, and you should verify every output against your own course or institutional requirements.
Canadian Legal Citation Builder
Assembles citation components from your own inputs so you can compare the result against your course requirements.
Case Brief Builder
A structured worksheet for facts, issues, holding and reasoning that you fill in from the decision itself.
Table of Authorities Builder
Sorts and groups the authorities you enter into a table you can copy into a factum draft.
Estimates only - not legal advice
All calculations produced by this website are estimates. Laws, interest rates, and rules can change. You should obtain professional legal or financial advice before relying on any result. LegalCalc Ontario is not a law firm and does not provide legal advice.