Founders' list open
Calculations as strong as your legal argument.
31 Brazilian legal calculations with the legal basis behind every number, the history of every change, and Themis, our AI assistant, preparing everything for you to review and sign.
The first 500 people to sign up pay 10% less for as long as their subscription is active. No spam: only messages about the launch and the founders' list. Unsubscribe at any time. See the calculations
| Period | Operation | Amount |
|---|---|---|
| 07/2019 | 3,200.00 × 1.284500Lei 8.213/91, art. 29-B | 4,110.40 |
| 08/2019 | 3,200.00 × 1.281900Lei 8.213/91, art. 29-B | 4,102.08 |
| 09/2019 | 3,650.00 × 1.279300Lei 8.213/91, art. 29-B | 4,669.45 |
| Adjusted by the lawyerJustification: Pay stub for 09/2019 attached to the initial petition.Engine value: R$ 4,093.76 | ||
Average of the 3 salaries
12,881.93 ÷ 3
Lei 8.213/91, art. 29
R$ 4,293.98
Illustrative values, only to show the format.
- 31Brazilian legal calculations
- 6areas of Brazilian law
- Legal basis on every line
- Frozen, versioned results
- AI that never invents a number
A wrong number costs more than time. It costs credibility.
Spreadsheets nobody can audit
Formulas copied from one file to another, overwritten cells and no indication of where each number came from. Months later, even the author cannot explain it.
Indexes and rules that change along the way
Rates, tables and case-law positions change while a case is running. Without a record of the version used, it is hard to tell which rule applied when the calculation was made.
A calculation challenged by the other side or the court expert
When a calculation is questioned, you need to show the formula, index and legal provision behind every line. Rebuilding that from scratch takes time the deadline does not allow.
You answer for the calculation. You deserve a tool that shows where every number comes from.
You sign the calculation. We show where every number comes from.
Legal basis at every step
Formula, official index and legal provision next to every amount.
Everything tracked
Version history: every change becomes a version, and you can compare any two.
You adjust
Change any amount with a justification. It goes into the report as entered by the lawyer.
AI does not calculate
Themis, the AI assistant, reads documents and explains. The numbers come from the engine.
Themis · AI assistant
Start by talking. Finish by signing.
Themis prepares the calculation inputs, and you review every flagged field. The engine does the math, and the calculation breakdown shows the legal basis.
How it works, in 5 steps
- You open the calculation.
- You upload the CNIS (INSS contribution record) or answer the questions.
- Themis fills in the fields, flagged "review".
- The engine calculates.
- You check and adjust.
- Start of employmentFeb 1994Review
- Last salaryR$ 5,380.00Review
- Application date14 Mar 2027Review
CNIS of 100 pages read in under 1 second, without AI.
The full form is always one click away.
51 Brazilian legal calculations. One standard of rigor.
From social security to criminal law, all follow the same standard: a calculation breakdown with the legal basis, a frozen, versioned result and adjustments with a justification. The 31 most used come out at launch; the rest arrive one a week.
15Social security
15 calculations
View calculations: Social security
- Concessão e planejamento previdenciário (RGPS)
- Revisão de benefício (RGPS)
- Análise rápida do CNIS
- Restabelecimento de benefício
- Liquidação de sentença previdenciária
- Contribuições em atraso
- Complementação de contribuição
- Restituição de contribuições acima do teto
- BPC/LOAS
- RPPS União (concessão)
- RPPS União (revisão)
- RPPS estados e municípios (concessão)
- RPPS estados e municípios (revisão)
The count includes 2 calculations kept only as history, which do not appear in this list.
16Civil
16 calculations
View calculations: Civil
- Atualização de débitos e liquidação
- Débitos da Fazenda Pública
- Ações tributárias (atualização)
- Restituição de descontos indevidos do INSS
- Restituição de tarifas bancárias
- Revisão do PASEP
- Pensão alimentícia
- Distrato de imóveis
- Revisão de aluguéis
- Parcelamento do art. 916 do CPC
- Herança e partilha
- Planejamento sucessório
- Revisão do FGTS
- Divórcio e partilha de bens
- Reajuste de planos de saúde
- Reparação de danos
5Labor
5 calculations
9Tax
9 calculations
View calculations: Tax
- Exclusão do ICMS da base do PIS/COFINS
- Exclusão do ISS da base do PIS/COFINS
- PIS/COFINS na própria base (Tema 1067)
- Limite de 20 salários mínimos para terceiros (Tema 1079)
- TUST/TUSD na base do ICMS
- Mudança de alíquota e restituição
- IRPJ/CSLL de clínicas (equiparação hospitalar)
- Comparação de regimes tributários
- PIS/COFINS monofásico
3Banking
3 calculations
View calculations: Banking
3Criminal
3 calculations
View calculations: Criminal
WhatsApp service
Your client sends the photo. You get the draft.
The client chats through the official WhatsApp channel. Themis, the AI assistant, organizes the documents that arrive, and the lawyer reviews before any number goes out.
Official WhatsApp channel
The client sends photos and files to the firm's number.
Documents organized
Themis sorts and identifies what arrived, and builds the draft calculation.
Review comes first
No number goes out without the lawyer's check.
- cnis.pdf09:41
- IMG_2041.jpg09:42
- IMG_2042.jpg09:42
Themis· Documents organized
- cnis.pdfCNISReview
- IMG_2041.jpgCTPSReview
- IMG_2042.jpgRGReview
Your clients' passwords, kept the way they should be.
Access to gov.br, INSS, registry offices, city halls and courts, in one vault.
Encryption per firm
Each firm has its own key, stored outside the database.
Reveal only with 2FA
To view a password, you must confirm your identity with two factors.
Every access logged
Creating, revealing, changing and deleting all leave an audit record.
Consent form
Your client authorizes the storage of their credentials.
Your client authorizes the storage; we also support the electronic power of attorney in Meu INSS.
Reports with your firm's identity, on every plan.
The report comes ready to attach, with your branding and the legal basis for every number.
- Cover with the firm's identity
- Summary of the result
- Calculation breakdown
- Legal basis and indexes used
- Footer with the engine version and the tables hash
Calculation opinion
Retirement planning
Benefit salary (average)
R$ 4,293.98
Estimate with illustrative values.
Calculation breakdown (excerpt)
- 07/20193,200.00 × 1.284500Lei 8.213/91, art. 29-B4,110.40
- 08/20193,200.00 × 1.281900Lei 8.213/91, art. 29-B4,102.08
- 09/20193,650.00 × 1.279300Entered by the lawyer4,669.45
Legal basis and indexes
- Lei 8.213/1991, arts. 29 and 29-B
- INPC (IBGE), captured on Nov 5, 2026
- Constitutional Amendment 103/2019, art. 26
Page 2 of 12Engine v1.0.0 · tables sha256 9f3a…c21e
Compare with what you use today.
| Criterion | Cálculo do Advogado | Spreadsheet | Free calculators | Traditional calculation software |
|---|---|---|---|---|
| Legal basis next to every number | YesLine by line | No | No | PartialFixed methodology text |
| Version history and comparison | YesVersion history | No | No | PartialLimited |
| Manual adjustment recorded in the report | YesWith justification | PartialManual, not recorded | No | PartialLimited |
| Result frozen with the engine version | Yes | No | No | PartialVaries |
| Alert when a rule changes | Coming soon | No | No | PartialVaries |
| Indexes with source and capture date | YesVisible | PartialYou maintain them | PartialSometimes | Yes |
| AI that reads documents without inventing numbers | YesThemis | No | No | PartialVaries |
| Unlimited clients | Yes | Not applicable | Not applicable | PartialOften capped by plan |
| Your branding on the report | YesAll plans | PartialManual | No | PartialOften only on the top plan |
| Cancellation | YesIn 1 click | Not applicable | Not applicable | PartialOften through support |
| Credentials vault with 2FA | YesVault | No | No | PartialRare |
Comparison with typical features of each tool category, as of November 2026. It does not refer to any specific product.
Why switch
Time
Themis fills in the fields for you to review, and the CNIS is read in under 1 second, without AI, instead of being typed in line by line.
Legal certainty
A legal basis on every line and a history of every change, so you can explain the calculation when it is questioned.
Fair price
All calculations and unlimited clients on every plan, with a special condition for founders.
Citizen mode · Coming soon
Your clients arrive informed, with the calculations in hand.
The citizen runs a guided estimate and receives a code to give to the lawyer they hire. The firm imports everything, with the citizen's consent.
The citizen's estimate is for guidance only and does not replace the lawyer's analysis.
How it will work
- The citizen runs the guided estimate, without creating an account.
- They receive a sharing code.
- They give the code to the lawyer they hire.
- The firm imports the data, with consent.
The first 500 sign-ups join the founders list.
Sign up and be among the first 500: you pay 10% less for as long as your subscription is active and help decide the direction of the product.
What founders receive
- −10% for as long as the subscription is active
- Early access
- Direct channel to the product's founders
- A vote on the roadmap
- "Founder" badge on your profile
- Your name on the Founders Wall, optional
The Wall shows only name, city and area, and requires separate consent.
What it costs
Pricing coming soon
Prices will be announced soon. Founders get 10% off for as long as the subscription is active.
On every plan:
- Unlimited clients
- all calculations
- cancel in 1 click
- 7-day cooling-off period
Security and LGPD, item by item.
Data in Brazil
The database and files are stored on servers in the country.
Isolation per firm
The database keeps each firm's data separate; one cannot see another.
Two-factor authentication
Access protected by 2FA, also required to reveal a credential.
Encrypted vault
Credentials are encrypted with one key per firm.
Audit trail
Sensitive access and changes generate a record that cannot be edited.
Your data, your decision
Under the LGPD, Brazil's data protection law, the data subject can export and delete their own data.
What you need to know before you join.
Direct answers about the product, your data and the founders' list.
What is Cálculo do Advogado?
It is Brazilian software for legal calculations under Brazilian law, made for the lawyer who signs the calculation. It shows the legal basis of every number, records each change as a version and lets the lawyer adjust any amount with a justification. At launch, it offers 31 calculations in 6 areas. It is a BZI product.
Does the calculation replace my analysis?
No. The system prepares the calculation, shows the basis of each number and records the history, but the legal analysis and the final check remain yours. You review the filled-in fields, adjust what is needed and sign. The lawyer who signs a calculation is responsible for the calculation presented.
Where do the indexes and tables come from?
From official sources, such as IBGE and the Central Bank of Brazil, depending on the index. Each value keeps its source, capture date and effective period, and the report lists the series used with a verification code for the tables. If a value is missing, the calculation shows a warning; the system does not silently repeat the last value.
What happens when a law or an index changes?
Your saved calculations do not change on their own. Each result stores the engine version and the code of the tables used, so reopening it shows exactly what was calculated. Recalculating is your action and displays the difference. The automatic alert for rule changes is coming soon and is not part of the launch.
Can I adjust a value manually?
Yes. You can change any index, table or line value, as long as you give a justification. The adjustment is recorded with author and date, appears in the calculation breakdown and goes into the report as entered by the lawyer, with the engine-calculated value alongside it for whoever reviews the document.
Does the AI do the calculation?
No. Themis, our AI assistant, reads documents, fills in fields for you to review and explains the result. The engine does the calculating: it is deterministic, with the legal basis on every line. Any number cited in an explanation must exist in the calculation breakdown or the inputs, and a validator blocks anything that does not.
Which calculations are available at launch?
At launch, at least 31 of the most used calculations. After that, one new calculation comes out every week until all 51 in the catalog are available, across 6 areas: Social security (15), Civil (16), Labor (5), Tax (9), Banking (3), and Criminal (3). The full list, with links, is in the calculations section of this page. Two of them are available only as history. All follow the same standard: legal basis, versioned result, justified adjustments.
Can I use my firm's branding on the report?
Yes, on every plan. The report carries your firm's identity: the name, visual identity and professional details you configure. The footer shows the engine version and the code of the tables used in the calculation, which helps whoever reviews the document later.
How do the founders' list and the 10% discount work?
The first 500 people who sign up through the form on this page and confirm through the link in the email become founders: they pay 10% less for as long as their subscription is active and get early access, a direct channel to the team, a vote on the roadmap and a profile badge. Order follows confirmation, and the request must be sent by 11:59 p.m. (Brasília time) on the day before launch; the launch date will be announced on the site and by email at least 10 days in advance.
Are my data and my clients' data safe?
The database and files are stored on servers in Brazil, with each firm's data kept separate, two-factor authentication and an audit log. Vault credentials are encrypted per firm and revealed only with recent 2FA. Client data never goes to external AI services, and data subjects can export and delete their data.
How do I cancel?
In 1 click, directly in the dashboard, without contacting support. The plan is monthly by default, and the annual plan requires explicit acceptance. You also have a 7-day cooling-off period after subscribing. Before canceling, you can export your data, a right the LGPD, Brazil's data protection law, guarantees to data subjects.
When will the product launch?
The date has not been set yet and will be announced at least 10 days in advance. Anyone on the list gets the notice by email and WhatsApp, with no spam. In the meantime, the founders' list stays open, and founders get early access to the product. To take part, use the form on this page.
Be one of the first 500 and pay 10% less.
Leave your name, email and WhatsApp: the first 500 sign-ups get the discount. No spam: only messages about the launch and the founders' list. Unsubscribe at any time.
What founders receive
- −10% for as long as the subscription is active
- Early access
- Direct channel to the product's founders
- A vote on the roadmap
- "Founder" badge on your profile
- Your name on the Founders Wall, optional