The Devil's Utilities
Legal calculators that actually work — native, instant, no sign-up. Deadlines, interest, tax, mortgages: the Devil's Lawyer workbench. The section keeps growing.
⏱ Deadlines & Terms
⚖️ Civil procedural deadlines
Pick the deadline from the dropdown (before and after the Cartabia reform) or set it manually. Applies the court summer recess (1–31 August), national holidays and art. 155 c.p.c.
⚖️ Art. 171-ter c.p.c. briefs — the three deadlines at once
Enter the date of the hearing under art. 183 c.p.c.: it computes backwards the three deadlines (40 · 20 · 10 days before), with the court summer recess and bringing-forward to the non-holiday (art. 155 §5 c.p.c.).
⏳ Limitation / forfeiture
From the date of the event, add the term and get the deadline.
📅 Days between two dates
How many days (and years/months) separate two dates.
📆 Working days
Counts the working days between two dates (endpoints included), excluding Saturdays/Sundays and national holidays.
National holidays; local patron saints and regional calendar holidays excluded.
📈 Rates & Interest
📈 Statutory interest
Art. 1284 c.c. — pro-rata calculation with the annual rates (MEF decrees).
Rates 2014–2026 (2026: 1.60% — DM MEF 10/12/2025). Check the MEF decree of the year for official amounts.
💢 Custom-rate interest
For interest at a chosen rate (e.g. default interest under D.Lgs. 231/2002: ECB rate published in the Official Gazette + 8 points). Enter the official rate yourself.
🏦 Mortgages & Revaluation
🏦 Mortgage payment (French amortization)
French amortization: constant payment, principal + interest.
📊 ISTAT revaluation
Revalue an amount with the two ISTAT FOI indices (copy them from the ISTAT website: no made-up figures).
💶 Invoicing & Tax
💶 Lawyer invoicing
From the fee note to the full invoice: 15% general expenses, taxable expenses, art. 15 advances, CPA + VAT − withholding tax.
🧾 VAT calculator
Add VAT to a net amount or extract it from a gross amount.
📑 Court fee (contributo unificato)
Ordinary values of art. 13 DPR 115/2002, civil proceedings. Instance surcharges included.
Excluded: €27 stamp, doubling for failure to declare value, special proceedings and exemptions. Check the specific case.
⏲ Minutes ↔ hundredths
For time-based billing: convert minutes into hundredths of an hour (30 min = 50) and vice versa.
🔎 Checks & Personal data
🏦 IBAN check
Formal check with the international check digits (mod-97, ISO 13616). It does not verify that the account exists.
🧮 VAT-number check
Formal check of the 11 digits with the check digit (Luhn algorithm). It does not verify existence at the Italian Revenue Agency.
🎂 Age calculator
Exact age at a reference date (today if not given): years, months and days.
⚠ Disclaimer and limitation of liability
Mere calculation tools, for operational and informational purposes. They do not constitute a legal opinion or advice and do not create any professional relationship. The results are indicative and must always be verified in the specific case (special proceedings, particular starting points, court/local patron-saint holidays, interrupting or suspending acts, subsequent legislative changes): they may contain errors or be out of date. No warranty of accuracy, completeness or currency; all liability is excluded for damage arising from the use of or reliance on the calculations. The final verification and decision rest with the professional.