Compound Interest Calculator
In-app purchases
Everyone
info
10+
Downloads
About this app
How much is your money really growing?
Most compound interest calculators hand you a gross figure. Once tax is withheld and inflation is taken into account, what you actually keep is a different number. This app shows all three side by side: GROSS, NET and REAL.
SIX CALCULATORS, ONE APP
• Compound interest — How your savings grow over time, with a starting amount, regular contributions, an annual escalation and your choice of compounding interval. Year-by-year breakdown and a growth chart.
• Solve for a goal — Works backwards from the amount you want: the rate, the time, the regular contribution or the starting capital needed to reach it.
• Loan & instalments — Monthly payment, total repaid and the true cost of borrowing. The amortisation schedule shows how much of each instalment is principal and how much is interest, and it works out what settling early would cost and save.
• Deposit & term accounts — Term counted in days, and the amount you receive after withholding tax. Rates that change with the length of the term are applied by band.
• Retirement & FIRE — Your FIRE number from your own safe withdrawal rate, how far along you are and how many years are left. Coast FIRE included, all in today's money.
• Inflation & purchasing power — What today's money will be worth later, what past money is worth now, and the real return left once inflation is stripped out of a nominal one.
TAX AND INFLATION ARE ACTUALLY CALCULATED
Tax rules are not hard-coded. They are dated rule packs: Turkey, Germany, Brazil, Spain, and a generic pack where you enter your own rate. Withholding that changes with the length of a deposit is applied by band, and an annual allowance is respected where the country has one.
Inflation is handled with the Fisher equation rather than a rough subtraction — over a long horizon the difference is not small.
ACCURACY
Money and rates are computed in decimal arithmetic, never in floating point, and rounding happens only when a figure is printed, never between steps. Results are checked against fixed test vectors produced by an independent reference calculator.
SAVE, COMPARE, SHARE
Save your calculations, then put two scenarios side by side and read the difference as a percentage — the app marks which input actually differs. Share a result as PDF or CSV, and keep your latest saved figure on a home screen widget.
WORKS OFFLINE, NO ACCOUNT NEEDED
Every calculation runs on your device and returns the same answer in airplane mode. There is no sign-up and no account. Your inputs and saved calculations never leave your phone; the internet is used only to verify a subscription.
FIVE LANGUAGES, LOCAL FORMATS
English, Turkish, German, Spanish and Portuguese (Brazil). Currency and number formatting follow your region. There is a separate wording mode for participation banking, where profit share replaces interest. Light and dark themes, phone and tablet layouts.
PRO SUBSCRIPTION
All six calculators are free and stay free; the free version keeps three saved calculations. Pro unlocks unlimited saves, scenario comparison, PDF and CSV export, the home screen widget and the extra colour themes. Weekly, monthly and yearly plans are available, and the monthly and yearly plans start with a free trial. Price, period, renewal and how to cancel are shown on the purchase screen before you buy. The subscription renews automatically at the end of each period until cancelled; you can cancel any time in your Google Play account settings.
IMPORTANT
This app is a calculator. Its results are for information only and are not investment, tax or legal advice. Tax rates and legislation change; check current rules and a qualified professional before any significant decision. Future returns cannot be guaranteed.
Most compound interest calculators hand you a gross figure. Once tax is withheld and inflation is taken into account, what you actually keep is a different number. This app shows all three side by side: GROSS, NET and REAL.
SIX CALCULATORS, ONE APP
• Compound interest — How your savings grow over time, with a starting amount, regular contributions, an annual escalation and your choice of compounding interval. Year-by-year breakdown and a growth chart.
• Solve for a goal — Works backwards from the amount you want: the rate, the time, the regular contribution or the starting capital needed to reach it.
• Loan & instalments — Monthly payment, total repaid and the true cost of borrowing. The amortisation schedule shows how much of each instalment is principal and how much is interest, and it works out what settling early would cost and save.
• Deposit & term accounts — Term counted in days, and the amount you receive after withholding tax. Rates that change with the length of the term are applied by band.
• Retirement & FIRE — Your FIRE number from your own safe withdrawal rate, how far along you are and how many years are left. Coast FIRE included, all in today's money.
• Inflation & purchasing power — What today's money will be worth later, what past money is worth now, and the real return left once inflation is stripped out of a nominal one.
TAX AND INFLATION ARE ACTUALLY CALCULATED
Tax rules are not hard-coded. They are dated rule packs: Turkey, Germany, Brazil, Spain, and a generic pack where you enter your own rate. Withholding that changes with the length of a deposit is applied by band, and an annual allowance is respected where the country has one.
Inflation is handled with the Fisher equation rather than a rough subtraction — over a long horizon the difference is not small.
ACCURACY
Money and rates are computed in decimal arithmetic, never in floating point, and rounding happens only when a figure is printed, never between steps. Results are checked against fixed test vectors produced by an independent reference calculator.
SAVE, COMPARE, SHARE
Save your calculations, then put two scenarios side by side and read the difference as a percentage — the app marks which input actually differs. Share a result as PDF or CSV, and keep your latest saved figure on a home screen widget.
WORKS OFFLINE, NO ACCOUNT NEEDED
Every calculation runs on your device and returns the same answer in airplane mode. There is no sign-up and no account. Your inputs and saved calculations never leave your phone; the internet is used only to verify a subscription.
FIVE LANGUAGES, LOCAL FORMATS
English, Turkish, German, Spanish and Portuguese (Brazil). Currency and number formatting follow your region. There is a separate wording mode for participation banking, where profit share replaces interest. Light and dark themes, phone and tablet layouts.
PRO SUBSCRIPTION
All six calculators are free and stay free; the free version keeps three saved calculations. Pro unlocks unlimited saves, scenario comparison, PDF and CSV export, the home screen widget and the extra colour themes. Weekly, monthly and yearly plans are available, and the monthly and yearly plans start with a free trial. Price, period, renewal and how to cancel are shown on the purchase screen before you buy. The subscription renews automatically at the end of each period until cancelled; you can cancel any time in your Google Play account settings.
IMPORTANT
This app is a calculator. Its results are for information only and are not investment, tax or legal advice. Tax rates and legislation change; check current rules and a qualified professional before any significant decision. Future returns cannot be guaranteed.
Compound interest, deposit, loan & FIRE — real returns after tax and inflation
Updated on
Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
- No data shared with third partiesLearn more about how developers declare sharing
- This app may collect these data typesFinancial info and Device or other IDs
- Data is encrypted in transit
- Data can’t be deleted
What’s new
1.0.0 — the first stable release
No new screen this time — this build is a milestone. The app package is smaller: unused resources are now stripped more aggressively.
Nothing changed in your calculations or saved results.
No new screen this time — this build is a milestone. The app package is smaller: unused resources are now stripped more aggressively.
Nothing changed in your calculations or saved results.
App support
About the developer
MUSTAFA EREN TALAN
merentalan@gmail.com
Yenimahalle Demetevler Mahallesi 403. Sokak No:9
Gözüm Apartmanı Daire 11
06200 Yenimahalle/Ankara
Türkiye