Check your rent cap
for free.
AI-powered rent checks in under 60 seconds. Rent cap, Nebenkosten (utility/operating cost) statement, and rental contract — all in one place. Free forever.
Four steps.
No expertise required.
No sign-up, no credit card. Upload your documents — the AI does the rest.
Enter your data
Fill in the form or upload documents. Takes under 60 seconds.
AI analysis
Checked against current laws, rent-index (Mietspiegel) data, and case law.
Read your result
Find out whether you may be paying too much rent — with clear evidence.
Possible next steps
A pre-drafted letter to your landlord, or a referral to a tenancy-law firm.
One problem,
one tool.
Seven specialised AI analyses. Each ending with a ready-to-send letter.
Rent-price checker
Enter your address and rent details. In seconds we check them against local rent indices (Mietspiegel) and the Mietpreisbremse (rent cap) under § 556d BGB.
Nebenkosten (utility cost) audit
Upload your Nebenkosten (utility/operating cost) statement. Our AI finds errors, inconsistencies, and calculates possible refunds.
Contract scanner
AI analysis of your rental contract for illegal clauses, excessive deposits (Kaution), and hidden risks.
Rent reduction
Does your flat have defects? We calculate the permitted rent reduction (Mietminderung) and draft your defect notice.
Deposit back
Is your landlord withholding your deposit (Kaution)? We check the legal position and draft your demand letter.
Rent increase check
Received a rent increase? We check whether it's permissible under the rent index (Mietspiegel) and the capping limit (Kappungsgrenze).
Contract review
Have your rental contract reviewed BEFORE you sign. Our AI spots risks and gives negotiation tips.
Free calculators.
Instant, no sign-up.
19 law-based calculators with no AI — the result appears instantly in your browser.
Notice Period Calculator
Work out your notice period as a tenant or landlord and the earliest permitted end date of the tenancy — free, no sign-up required.
Operating Costs Check
Check which items on your Nebenkosten (utility/operating costs) statement can actually be passed on to you under § 2 BetrKV — free.
Modernisation Surcharge Calculator
How much may the landlord add to the rent after a modernisation? Calculate the permitted increase, including the cap.
Living Area Calculator
Is your flat smaller than stated in the contract? From a 10% discrepancy you can reduce the rent — calculate the possible refund.
Deadline Calculator
Objection to a utility statement, consent to a rent increase, deposit refund: calculate the most important tenancy-law deadlines.
Rent Index Comparison
Compare your rent with the customary local reference rent (ortsübliche Vergleichsmiete) based on the local Mietspiegel (rent index) — free.
Cosmetic Repairs Check
Is your redecoration clause valid? Check the clause wording for typical invalid patterns (rigid deadlines, pro-rata cost clauses).
Stepped Rent Calculator
Calculate how the rent develops under a stepped-rent contract (Staffelmiete) for each year — free, no sign-up required.
Rent Arrears Check
At what point of rent arrears does termination without notice threaten — and how can it be averted through a grace-period payment?
Heating Costs Check
Was your heating-cost statement split correctly between consumption and floor area? Check your right to a 15% reduction.
CO₂ Cost Split
How much of the CO₂ levy on your heating costs does the landlord bear? Calculate the split under the statutory tiered model — free.
Index Rent Calculator
How much may your index rent rise? Calculate the new rent based on the change in the consumer price index — free.
Rent-Increase Cap Calculator
Is the rent increase covered by the cap? Check whether the rent rises by more than 15/20% over three years — free.
Deposit Interest Calculator
How much interest should your rental deposit (Kaution) have earned? Calculate the interest accrued over the tenancy — free.
Utility Cost Allocation Key
How large is your share of the utility costs? Calculate your share by living area, number of occupants or consumption — free.
Owner's Own Use Checker
Is the owner-occupation termination (Eigenbedarf) valid? Check the eligible group of people, the reasons, the notice period and possible hardship cases — free.
Subletting Checker
May you sublet part of your flat? Check your right to permission and a possible subletting surcharge — free.
Termination Letter Generator
Create a correct termination letter with an automatically calculated end date — free and without sign-up.
Handover Report
Create a handover report with meter readings, keys and defects — as evidence at move-in or move-out, free.
Why not go to a
lawyer or tenants' association (Mieterverein)?
Both are valuable — with different goals. Here's what KlarMiet does differently.
Where does the
rent cap apply?
The Mietpreisbremse (rent cap) applies in over 300 cities. Here are the largest ones with an available Mietspiegel (rent index).
Berlin
Rent index · rent cap active · check for free.
München
Rent index · rent cap active · check for free.
Hamburg
Rent index · rent cap active · check for free.
Frankfurt
Rent index · rent cap active · check for free.
Köln
Rent index · rent cap active · check for free.
Düsseldorf
Rent index · rent cap active · check for free.
Stuttgart
Rent index · rent cap active · check for free.
Leipzig
Rent index · rent cap active · check for free.
Dresden
Rent index · rent cap active · check for free.
Hannover
Rent index · rent cap active · check for free.
Nürnberg
Rent index · rent cap active · check for free.
Bremen
Rent index · rent cap active · check for free.
The essentials
at a glance.
In three minutes you'll know
whether your contract is clean.
No sign-up, no credit card, no fine print.