Calculate a deadline and inspect the cited rule and counting steps.
Calculator and source coverage reviewed 31 August 2026 · Review methodology
Loading calculator...
A result you can inspect
Every completed calculation keeps the triggering event, the selected rule, its citation and the ordered calculation steps together. That makes the result quicker to review against the current source before it enters your diary.
A cited calculation
Choose a jurisdiction to see a local worked example
Choose the court, tribunal or institution and the triggering event
Official sourceThe calculator applies the selected counting method
Counting ruleInspect holidays, exceptions, orders and the current source
User checkIllustrative result. Check the selected rule, current source and case facts.
What Professional adds
Step through the workflow. See the result enter a matter, reach a subscribed calendar and change without erasing the calculation that came before it.
Calculation ready. The defence deadline is 14 August 2026.
Matter timeline
Harwood v Lyle Logistics
Defence due
14/08/2026
Claim form served · 14-day period
Calculation complete
10:42Defence due 14/08/2026
CPR 15.4 · ready to save
This demonstration changes only the example above. It does not save your data.
Common deadline checks
Open a focused calculator with the relevant rule selected. The full catalogue covers 4,871 rules across 20 jurisdictions.
cpr
Calculate when a claim form is deemed served under CPR 6.14, with the second-business-day rule and court closure dates shown.
cpr
Calculate the 14-day acknowledgment of service deadline under CPR 10.3 from the deemed service date of the claim form.
cpr
Calculate the CPR 15.4 defence deadline: 14 days after service of particulars, or 28 days where an acknowledgment was filed.
cpr
Calculate the minimum 21-day relevant period for a Part 36 offer under CPR 36.5(1)(c), with clear-day counting shown.
cpr
Calculate the usual 21-day deadline to file an appellant's notice under CPR 52.12(2)(b), subject to any different court direction.
employment-tribunal
Calculate the usual three-months-less-one-day unfair dismissal ET1 limit, including an ACAS Early Conciliation extension.
Simple pricing
Professional monitors a matter. A one-off PDF puts one eligible calculation on file. Checkout shows the price in your currency.
Choose a jurisdiction to see local prices
One-off PDF record
$19.99Paddle confirms the final total at checkout
one-off · no subscription
A permanent PDF with the inputs, working and citations. Hosted redownload remains available for 30 days.
Calculate for a PDF recordFree
$0
forever
Calculate free, with the citation and steps shown.
Calculate freeProfessional
$299.99Paddle confirms the final total at checkout
per year
$29.99Paddle confirms the final total at checkout monthly is also available. Payment starts immediately.
Checking ProfessionalMethodology
The trigger, period, direction, counting method, calendar and citation are applied in a repeatable calculation you can inspect.
How the engine countsWhat is included
Each jurisdiction page publishes its included forums, source collections and known exclusions. Court orders, local practice and fact-specific discretion are not silently inferred.
Inspect jurisdiction coverageReview status
Coverage pages show their compact rule-review date. Published rule changes are retained in the change log and connected to affected saved matters when possible.
Read the rule change logDeadline Engine calculates the procedural deadlines listed on each jurisdiction page. The current catalogue contains 4,871 deadline rules across 20 jurisdictions. Each page shows what is included, when its rules were reviewed and what still needs checking.
Deadline Engine applies the selected rule and shows the citation and calculation steps. It is calculation software, not legal advice, so check the current source, any order and the facts of your matter.
Free gives you the date, citation and calculation steps. Professional saves and monitors deadlines across your matters, with calendar feeds, recalculation history, rule-change warnings and exports.
The formal Evidence Record is a one-off PDF containing the jurisdiction, forum, triggering event, inputs, result, rule ID and version, citation, calculation steps and generation time. It does not start a subscription.
Professional recalculation creates a new version and retains the earlier record. A changed published rule can identify saved matters that may be affected, without silently overwriting their history.
No account is needed to calculate deadlines. An account is required to save and monitor matters with Professional.
Calculate free with the citation and working visible. Then save the result to a matter or buy a PDF calculation record when the file needs more than an answer.
Deadline Engine provides procedural calculation software, not legal advice. Verify the current rule and matter facts.
Cookie preferences
Deadline Engine uses necessary cookies for authentication and security. You can choose whether we may load Plausible Analytics to measure aggregate site use. We do not use advertising or marketing tracking. You can change this any time from the footer. Read the Cookie Policy.
