LegalCalc Ontario

Calculators

Ontario legal calculators

Choose a calculator below. Every tool includes a full breakdown, a worked example, and links to official Ontario sources.

General

Ontario Court Interest Calculator

Prejudgment, postjudgment, or custom simple interest with a full payment ledger.

Rent Arrears Calculator

Monthly rent, payments, and additional amounts with a running balance.

Rent Increase Calculator

Ordinary Ontario guideline (2026 = 2.1%, 2027 = 1.9%), 12-month rule, and 90-day notice date.

Legal Fees and HST Calculator

Fees, disbursements, HST, and retainer credit.

Small Claims Court

Six tools built around the Rules of the Small Claims Court (O. Reg. 258/98), O. Reg. 332/16 fees (2026), and the Courts of Justice Act.

Claim Value Estimator

Net principal, interest, fees and the $50,000 jurisdiction flag.

Court Fee Calculator

2026 clerk fees from O. Reg. 332/16 with infrequent/frequent rates.

Costs Estimator

Model party-and-party costs against the s. 29 15% cap.

Wage & Bank Garnishment Estimator

Wages Act 20% default, joint-debt 50% share, notice fee shown separately.

Ontario Small Claims Court Deadline Calculator

Rule 3.01 counting for verified presets - Defence (Rule 9.01), Defendant's Claim (Rule 10.01), six-month service (Rule 8.01), settlement conference disclosure, motion notice/filing/response and witness summons - plus custom modes.

Defendant's Claim / Counterclaim Estimator

Compare gross claims, model deadlines, and check the jurisdiction flag.