All calculators
Free, fast, privacy-friendly calculators for business days, legal deadlines, invoice terms and contracts — with multi-country holidays and clear breakdowns.
Business
Business Days Between Two Dates
Count weekdays between two dates, excluding weekends and holidays.
OpenAdd Business Days to a Date
Add N business days to a starting date, skipping weekends and holidays.
OpenCustom Holiday Business Day Calculator
Bring your own holidays — exclude any list of dates from counts.
OpenNZ / AU Business Day Calculator
New Zealand and Australia public holidays + business-day arithmetic.
OpenProject Milestone Projector
Project milestones forward by N business days from a kickoff.
OpenSpecific Weekday Adder
Add N Mondays (or any weekday) from a starting date.
OpenFiscal Year Business Day Counter
Working days remaining in your fiscal year.
OpenContract End Date Calculator
Find the end date of a fixed-term contract.
OpenShipping Delivery Date Estimator
Estimate delivery dates from carrier transit times.
OpenEvent Planning Buffer
Add a safety buffer to an event date.
OpenRecurring Meeting Date Generator
Generate N future meeting dates from a recurrence rule.
OpenSubscription Renewal Date
When does my subscription renew?
OpenInternational Business Day Converter
Cross-timezone business day overlaps.
Open4-Day / Custom Work Week
Calculate business days using any custom work-week pattern.
OpenDate Difference Analyzer
Years, months, weeks, days and business days between dates.
OpenBid / Tender / RFP Deadline
Project bid deadlines back from a target award date.
OpenBoard Meeting Notice Period
Reverse-calc the last day notices must go out before a board vote.
OpenCustoms Demurrage Penalty Tracker
First billable penalty day when a container overstays port free time.
OpenPerishable Shelf-Life Logistics Matrix
Match transit time against shelf-life so cold-chain shipments arrive fresh.
OpenJIT Manufacturing Reorder Window
Reverse-calc the latest purchase-order release day based on supplier lead time.
OpenMulti-Carrier Shipping Comparator
Side-by-side delivery dates for USPS, FedEx, UPS and DHL using each carrier's operating days.
OpenCustoms Clearance Date Estimator
Project the expected cleared-by date for international imports.
OpenBusiness Hours Between Two Dates
Working hours between two timestamps, excluding lunch breaks, weekends and holidays.
OpenTimezone Working Hours Overlap
Find the working-hour overlap between two time zones on a given day.
OpenWorking Days per Month
Workday count for every month of a given year, by country.
OpenWorking Days Left in Year
How many business days remain until December 31?
OpenBusiness Days Countdown to a Date
Live workday countdown to a future target date.
OpenHoliday Bridge-Day Finder
Spot when a public holiday creates a 3- or 4-day weekend by taking a bridge day off.
OpenConstruction Working Days Calculator
Site work days excluding weekends, holidays and weather/rain days.
OpenConstruction Shutdown Calculator
Net working days inside a date range after subtracting industry shutdowns.
OpenManufacturing Lead Time Calculator
Production lead time across multi-shift factory calendars.
OpenPurchase Order Lead-Time
Receipt date for a PO given supplier lead time and transit.
OpenWorking Hours + Business Days Combo
Business days between two dates, converted to working hours at your own day length.
OpenNZ Public Holiday Impact
Working days inside a range with all NZ regional anniversary days called out.
OpenFinance
Net 30 Invoice Due Date
Compute due dates for Net 15 / 30 / 60 / 90 invoices.
OpenPayment Terms Calculator (2/10 Net 30)
Discount cutoff + net due date for early-payment terms.
OpenFreelance Invoice Scheduler
Schedule recurring invoices with due dates and reminders.
OpenLoan / Mortgage Payment Projector
Monthly loan payment dates, rolled to banking days when they fall at a weekend.
OpenMilestone Payment Schedule
Schedule milestone payments from a kickoff date.
OpenACH Settlement Date Calculator
When direct-deposit files must hit the bank to land on payday (1-day / 2-day / same-day ACH).
OpenStock Option Post-Termination Exercise
Post-termination exercise window — the deadline and the last day the market is open to act.
OpenLetters of Credit Presentation Clock
UCP 600 document presentation deadline from bill-of-lading.
OpenReg CC Check Funds Availability
How long the bank can legally hold a deposit under Federal Reserve Regulation CC.
OpenT+1 / T+2 Trade Settlement
Equity, bond and FX settlement dates with NYSE/NASDAQ market-holiday handling.
OpenNZ Trade Settlement Date
Settlement dates using NZX trading-day rules and NZ public holidays.
OpenDebt Validation Letter Deadline (FDCPA)
30-day window to dispute a debt after a collector's validation notice.
OpenChargeback Response Deadline
Merchant response window by card network — Visa, Mastercard, Amex, Discover.
OpenIRS Tax Refund Date Estimator
Estimated refund window from e-file acceptance, including the PATH Act hold.
Open401(k) Deferral Deposit Deadline
DOL 7-business-day safe harbor for depositing employee 401(k) deferrals.
OpenPersonal
Age in Business Days
How many business days old are you?
OpenPregnancy Milestone Calculator
Trimesters, due date and milestone planner.
OpenSchool Term Business Day Counter
Working days remaining in a school term.
OpenWarranty / Guarantee Expiry
When does my warranty run out?
OpenRetirement Date Projector
When can I retire — business days countdown.
OpenDivorce / Marriage Waiting Period
State waiting periods for divorce or marriage license.
OpenPassport Renewal Timing Calculator
Estimated ready-by date against your trip, for routine or expedited processing.
OpenSchengen 90/180-Day Calculator
Rolling 90-days-in-any-180 stay limit for the Schengen Area, from your trip history.
OpenLegal
Legal Notice Deadline
Compute statutory notice deadlines by business days.
OpenCourt Date Calculator
Project the response, discovery and hearing dates a filing sets in motion.
OpenRight of Rescission (3-Business-Day)
TILA rescission deadline (US).
OpenCooling-Off Period Calculator
Statutory cooling-off period end date.
OpenEviction Notice Deadline
Statutory eviction notice cure period.
OpenStatute of Limitations Deadline
Filing deadline by claim type for the states with verified limitation periods.
OpenMechanic’s Lien Filing Deadline
State mechanic’s lien filing deadlines.
OpenPatent / Trademark Deadline
USPTO response and renewal deadlines.
OpenDiscovery / Court Filing Deadline
Discovery and motion filing deadlines.
OpenProbate Timeline Calculator
Probate estate administration timeline.
OpenService of Process Deadline
Add jurisdictional response time to a served document, accounting for delivery method and court holidays.
OpenNZ Court Filing Deadline
Filing deadlines under New Zealand court rules with regional public-holiday adjustments.
OpenCourt Deadline Extension
Adjusted deadline when the court is closed for holidays or judicial recess.
OpenNZ Filing Same-Day Cutoff
Same-day vs. next-day filing based on submission time and cutoff.
OpenEEOC Charge Filing Deadline
180-day vs. 300-day EEOC discrimination charge deadline by state.
OpenWorkers' Comp Reporting Deadline
Deadline to report a workplace injury to your employer and file a claim, by state.
OpenFederal Civil Appeal Deadline (FRAP 4)
30- or 60-day deadline to file a notice of appeal after federal judgment.
OpenHR
Payroll Pay Period Generator
Generate pay periods (weekly / biweekly / semi-monthly).
OpenVacation Accrual Projector
Project vacation/PTO accrual over time.
OpenProbation Period End Date
When does the probation period end?
OpenNotice Period / Last Working Day
Calculate the last working day from a resignation notice.
OpenFinal Paycheck Deadline (US)
State-by-state final paycheck deadline.
OpenFCRA Adverse Action Waiting Period
FCRA pre-adverse / adverse action timing.
OpenWARN Act Layoff Notice Deadline
Latest lawful notice date for a layoff — 60 calendar days under federal WARN, more under state mini-WARN.
OpenFMLA Leave Return-to-Work
Return-to-work date after 12 workweeks of continuous FMLA leave.
OpenI-9 Form 3-Business-Day Deadline
When new-hire I-9 documents must be signed and filed — 3 business days from start.
OpenPayroll Working Days per Period
Count payable workdays inside a weekly / fortnightly / monthly pay period.
OpenHybrid Work Schedule Calculator
Office vs. remote days per month for any hybrid pattern.
OpenRotating Shift Calendar
4-on-4-off, panama, dupont and custom shift rotations.
OpenPTO / Vacation Workday Counter
Leave days a booking really costs — half-days, holidays and shutdowns excluded.
OpenNZ Employment Notice Period
Last working day under New Zealand employment notice rules.
OpenSeverance Agreement Review Period (OWBPA)
21/45-day consideration period and 7-day revocation deadline for workers 40+.
OpenUnemployment Benefits Exhaustion Date
Final payable week for unemployment insurance given your start date and benefit weeks.
OpenFSA Grace Period & Run-Out Deadline
2.5-month grace period, carryover, and claims run-out deadlines for a flexible spending account.
OpenCompliance
Tax Filing Deadline Extender
Tax filing extension deadlines (US).
OpenGDPR / DSAR Response Deadline
Data subject access request response deadline.
OpenHIPAA Breach Notification Deadline
60-day HIPAA breach notification clock.
OpenOPT / STEM OPT / Visa Grace Period
F-1 OPT, STEM-OPT and visa grace period.
OpenSEC Filing Deadline
10-K, 10-Q, 8-K, Form 4 and Schedule 13D deadlines by filer status.
OpenFOIA Statutory Response Timer
When the agency must respond to your public records request (20 business days under federal FOIA).
OpenIRS 30-Day Levy Response Deadline
Final day to request a Collection Due Process hearing from an IRS LT11 / Letter 1058.
OpenVisa Processing Time Estimator
Estimated visa-issuance date from filing, by embassy operating days.
OpenCOBRA Election Deadline Calculator
60-day election window, first premium due date, and monthly grace period after coverage loss.
OpenH-1B 60-Day Grace Period Calculator
Last day to find new sponsorship, change status, or depart after an H-1B layoff.
OpenMedicare Initial Enrollment Period Calculator
7-month IEP window around your 65th birthday, including the born-on-the-1st rule.
OpenACA Special Enrollment Period Calculator
60-day deadline to enroll in ACA marketplace coverage after a qualifying life event.
OpenI-94 Expiration & Unlawful Presence Calculator
Authorized-stay end date plus the 180-day and 1-year unlawful presence bars.
OpenIT / SLA
SLA Response / Resolution Deadline
Service level agreement response/resolution clocks.
OpenSaaS SLA Service Credit Calculator
Total business-hours downtime vs. SLA uptime threshold, with service-credit estimate.
OpenSupport Ticket Response Deadline
First-response and resolution deadlines by priority, in business hours.
OpenReal Estate
Real Estate Closing Date
Project closing date from contract acceptance.
OpenSecurity Deposit Return Deadline by State
Statutory deadline for landlords to return a security deposit, by state.
Open1031 Exchange Deadline Calculator
45-day identification and 180-day exchange completion deadlines.
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