Finance calculators that feel like an app.
Drag a slider, watch the chart redraw. Save your scenario, share it as a link. The fastest, cleanest way to plan a mortgage, loan, or investment — built mobile first.
No sign-up. No tracking pop-ups. Just numbers.
Calculators
Built mobile first. Real-time charts. Save and share scenarios with a link.
Mortgage Calculator
LiveSee your real monthly payment with taxes and insurance. Visualize the full amortization in one chart.
Open calculatorLoan Calculator
LivePersonal, auto, or student loans. Adjust rate and term and see total interest update instantly.
Open calculatorCompound Interest Calculator
LiveProject investment growth with monthly contributions. Watch the compounding curve in real time.
Open calculatorSalary Calculator
LiveCalculate take-home pay across all 50 US states. Federal, state, FICA, and pre-tax deductions covered.
Open calculatorRefinance Calculator
LiveCompare your current mortgage to a refi scenario. See break-even point and lifetime savings.
Open calculatorRetirement Calculator
LiveProject your nest egg with 401(k), IRA, and brokerage contributions. Adjust for inflation.
Open calculatorTip Calculator
LiveAdd a tip and split a bill across any number of people. Quick presets and custom percentages.
Open calculatorWhy Kalkfin
Sub-1-second loads
Static-rendered, edge-cached, fonts and images optimized. Every interaction recalculates in real time.
Charts you can read
Amortization, principal vs interest, payoff curves. The chart updates as you drag — no toggles to find.
Save & share scenarios
Every calculation has a permanent URL. Send your numbers to a partner or advisor with one click.
No friction, no fluff
No pop-ups before you've seen a result. No 'Calculate' button. No paywalled basics.
Ready to crunch some numbers?
Start with the mortgage calculator. It takes a few seconds and you'll see your full amortization chart instantly.
Open mortgage calculator