Free finance calculators

Estimate monthly payments, total interest and amortization. Tentaco Loan Calculator: review input and get an instant result — free, no sign-up.

Monthly payment from loan, rate and term. Tentaco Mortgage Calculator: review input and get an instant result — free, no sign-up.

Calculate buyer payment with PayPal buyer protection so seller receives intended amount. Tentaco PayPal Fee Calculator: review input and get an instant result — free, no sign-up.

Add sales tax to a net price. Tentaco Sales Tax Calculator: review input and get an instant result — free, no sign-up.

Units needed to cover fixed costs. Tentaco Break-Even Calculator: review input and get an instant result — free, no sign-up.

Price per kg, liter or item. Tentaco Unit Price Calculator: review input and get an instant result — free, no sign-up.

Calculate tips and split the bill between people. Tentaco Tip Calculator: review input and get an instant result — free, no sign-up.

Calculate future value with compound interest. Tentaco Compound Interest Calculator: review input and get an instant result — free, no sign-up.

Calculate sale price and savings from a percentage off. Tentaco Discount Calculator: review input and get an instant result — free, no sign-up.

Convert annual salary to hourly rate. Tentaco Hourly Salary: review input and get an instant result — free, no sign-up.

Compute selling price from cost + markup. Tentaco Markup Calculator: review input and get an instant result — free, no sign-up.

Calculate profit and margin from revenue. Tentaco Profit Margin: review input and get an instant result — free, no sign-up.

Return on investment percentage. Tentaco ROI Calculator: review input and get an instant result — free, no sign-up.

Add VAT to net or compute tax amount. Tentaco VAT Calculator: review input and get an instant result — free, no sign-up.

Export invoice data to DATEV, Lexware and CSV. Tentaco Accounting Export: review input and get an instant result — free, no sign-up.

Generate invoice PDFs from CSV line items. Tentaco CSV to Invoice: review input and get an instant result — free, no sign-up.

Validate German public-sector Leitweg-ID format. Tentaco Leitweg-ID Validator: review input and get an instant result — free, no sign-up.

Validate German VAT ID (USt-IdNr.) format. Tentaco VAT ID Validator: review input and get an instant result — free, no sign-up.

Loans, taxes, margins and pricing calculators in one workspace. Tentaco Finance Studio: review input and get an instant result — free, no sign-up.

Export invoice data to DATEV and Lexware formats. Tentaco Datev Export: review input and get an instant result — free, no sign-up.

Everyday calculators for numbers, dates and health — fast results in your browser, no install.

Percentage, loan, BMI, tip, age and unit converters — instant browser calculators.

Create, open and validate XRechnung and ZUGFeRD in your browser. Schematron checks, templates and export — no sign-up; validation stays local when possible.