Compare two mobile phone tariffs purely computationally: total cost over the term, effective monthly cost including connection and device costs, and the difference - from your own inputs, without a tariff database.
Available
Inputs
Enter values
Live
Tariff A
€/Monat
Monthly base price of the first offer.
€
Connection fee and device price; 0 if none apply.
Tariff B
€/Monat
Monthly base price of the second offer.
€
Connection fee and device price; 0 if none apply.
Contract term
months
Period under review, e.g. 24 months.
Load example
For illustration only – your own calculation is what counts.
Explanation
How Mobile tariff calculator works
The mobile tariff calculator compares two mobile phone tariffs purely computationally. For both you enter the monthly base fee and the one-time costs and choose the contract term. From this the calculator determines the total cost, the effective monthly cost and the difference.
Total cost
Total costBase fee × term + one-time costs
All costs of a tariff over the entire contract term.
Effective monthly cost
Effective monthly costTotal costs / term
Spreads the one-time costs evenly across the term.
Practice
Practical examples
For illustration only – your own calculation is what counts.
Low monthly fee offsets hardware costs
Tariff A €20/month with no one-time costs, Tariff B €15/month with €120 hardware, 24-month term.
Result: Both tariffs cost €480 over the term and €20.00 effectively per month - the difference is €0.
Tariff with an extra payment stays cheaper
Tariff A €30/month with no one-time costs, Tariff B €25/month with €60 connection and device costs, 24 months.
Result: Tariff A costs €720, Tariff B €660 over the term; Tariff B is €60 cheaper, that is €2.50 per month.
Notes
Common mistakes
One-time costs forgotten
Only the base fee is compared, even though one tariff has connection or device costs.
Enter the connection fee and device price as one-time costs so that the effective monthly cost is correct.
Different terms compared
Two tariffs with different commitment periods are calculated over the same term.
For a fair comparison, choose the same observation period and relate the terms to it.
Only the price was considered
The cheaper tariff is chosen without checking the data allowance and services.
Weigh the computational cost difference against the data allowance, network and additional services.
FAQ
Frequently asked questions
What does the mobile tariff calculator calculate?
It compares two mobile phone tariffs you enter and calculates the total cost over the term, the effective monthly cost and the difference between the two tariffs.
What is the effective monthly cost?
The effective monthly cost spreads the one-time costs such as the connection fee and device price across the contract term and adds them to the monthly base fee. This makes tariffs with and without an extra payment comparable.
Which one-time costs do I enter?
Everything you pay in addition at the start of the contract: connection fee, provisioning charge and the device price of a subsidised smartphone. If there is nothing, you leave the field at 0.
Why do I need the contract term?
The term is the reference value: over it the base fee and one-time costs are summed into the total cost and then spread across the effective monthly cost.
Does the calculator show real tariffs?
No. No tariffs are stored and no prices are retrieved from the internet. All amounts are your own inputs from the two offers you are comparing.
Does the calculator name the cheapest provider?
No. It compares only the two tariffs you enter and shows the computational difference neutrally. It does not make a market recommendation.
Does the calculator take data allowance or performance into account?
No. It compares only the costs. Whether the data allowance, network coverage or additional services suit you is something you decide yourself alongside the pure price.
Are the results binding?
No. They are orientation based on your inputs; the provider's product information sheet and contract are decisive.
Limits
Limitations
All amounts are user inputs; no tariffs or market prices are stored and no data is retrieved.
Only the costs are compared, not the data allowance, network quality or additional services.
No recommendation of a cheapest provider; the product information sheet and contract are decisive.
Sources
Sources and references
Telekommunikationsgesetz (TKG) – Produktinformationsblatt und VertragslaufzeitBundesministerium der Justiz / Bundesamt für Justiz
Official basis for contract transparency, the product information sheet and permissible terms for telecommunications contracts.
View sourceRetrieved: 08/03/2026 · Verified on: 08/03/2026 · Primary source
Adds the monthly mobile phone costs to the household budget.
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