Finance made
simple.
Interest, loans, returns – all the essential calculations, directly in your browser, no sign-up needed.
Whether you're planning a loan, looking to invest your savings, or simply want to understand how interest really works – Zinsora gives you precise calculators with clear answers. Directly in your browser, no sign-up needed, free.
Our calculators are designed to make complex financial topics easy to understand. The Interest Calculator shows you the difference between simple and compound interest. The Loan Calculator explains loan types and creates a full amortisation schedule. The Return Calculator helps you compare savings plans, lump-sum investments and property – including inflation. The Budget Calculator shows how much of your salary is left at month-end.
All calculations run directly in your browser. Your data never leaves your device.
Interest Calculator – Compound Interest & Savings
Calculate interest for savings accounts, fixed deposits and savings plans — with compound interest
What does the Interest Calculator calculate?
The compound interest effect is one of the most powerful mechanisms in saving and investing. The longer the investment period, the stronger it works. Even small differences in interest rate lead to enormous differences in final capital over 20–30 years.
Tip: Compare simple interest and compound interest with the same amount – and see how large the difference is after 20 years.
Everything you need to know
about our calculators
Interest Calculator, Loan Calculator, Return Calculator und Budget Calculator – wofür werden sie genutzt und was bringen sie dir?
What is it used for?
The Interest Calculator helps you calculate the growth of your capital over time – whether for a savings account, fixed deposit or savings plan. You can choose between simple and compound interest and instantly see how much your money grows through the compound interest effect.
Typical use cases
- Plan a savings account or fixed deposit
- Understand and visualise the compound interest effect
- Compare different interest rates
- Combine savings rates with starting capital
Your advantages
- Instant calculation without sign-up
- Shows the real difference between simple and compound interest
- Sliders for quickly testing different scenarios
- All data stays in your browser
What is it used for?
The Loan Calculator helps you plan a mortgage or loan. It calculates your monthly payment, total costs and creates a full amortisation schedule – for annuity loans, repayment loans and bullet loans.
Typical use cases
- Plan property financing or purchase
- Realistically assess monthly payment
- Compare different loan types
- View amortisation schedule year by year
Your advantages
- Three loan types in one calculator
- Full amortisation schedule at a glance
- Visual cost breakdown (repayment vs. interest)
- No bank, no sales pressure – just numbers
What is it used for?
The Return Calculator shows how your invested capital can develop long-term – whether as a monthly ETF savings plan, a lump-sum investment or a property investment. Including inflation adjustment, you see the real value of your wealth.
Typical use cases
- Simulate ETF savings plan over years
- Plan a lump-sum investment in stocks or funds
- Realistically calculate property returns
- Factor inflation into purchasing power
Your advantages
- Three investment types directly comparable
- Inflation adjustment for realistic planning
- Shows capital gains vs. contributions clearly
- Ideal for long-term wealth planning
What is it used for?
The Budget Calculator helps you keep track of your monthly household budget. Enter income (salary, Part-time Job, Child Benefit) ande Fixed Costs und variable expenses ein – und sieh sofort, wie viel am Monatsende übrig bleibt.
Typical use cases
- Plan monthly budget in a structured way
- Einsparungspotenziale bei Abos & Fixed Costs erkennen
- Build emergency fund and reserves purposefully
- Distribute surplus wisely between saving & investing
Your advantages
- Dynamic rows – add your own categories
- 50-30-20 rule as instant comparison
- Concrete recommendations: emergency fund, debt, ETF
- All data stays exclusively in your browser
When does it make sense?
Overpay the mortgage or invest? The decision comes down to comparing your mortgage rate against achievable after-tax returns. Above 4–5%, overpayment is hard to beat.
What you'll learn
- Overpayment vs. ISA/ETF: direct comparison
- How tax changes the maths
- Hybrid strategy: repay AND invest
Which pays more in 2026?
Easy access savings are flexible, fixed-rate bonds pay more. When each makes sense – and how a savings ladder gets the best of both worlds.
What you'll learn
- Current rates 2026 compared
- FSCS protection and limits
- Fixed-rate ladder strategy
Budgeting made simple
50% for needs, 30% for wants, 20% for saving. The simplest way to split your salary – no spreadsheet required. Works even in expensive cities.
What you'll learn
- 50-30-20 with concrete examples
- What to do when rent is too high
- Most common budgeting mistakes
What is your money really worth?
At 3% inflation, £100,000 is worth only £55,000 after 20 years. What actually protects against inflation – and why easy access savings aren't enough.
What you'll learn
- Calculate purchasing power loss
- Best inflation hedges compared
- Real return vs. nominal return
Frequently Asked Questions
Answers to the most important questions about interest, loans, returns and budgeting
Why Zinsora?
Zinsora was founded because financial topics are too often presented in unnecessarily complicated ways. Our goal is to provide you with precise, understandable calculators – without registration, without hidden costs, without your data leaving your device. All calculations run entirely in your browser. Whether you are planning a property loan, optimising your ETF savings plan, structuring your monthly budget or identifying savings potential – Zinsora gives you the numbers you need.
⚠️ All calculations are non-binding and serve as guidance only. They do not replace professional financial, tax or legal advice.