Calculators that show their work.
Every formula visible. Every assumption editable. No popups, no email walls, no upsells. Ten tools covering mortgages, savings, loans, credit cards, and net worth. Built for back-of-the-envelope first, deep-dive second.
Every calculator, one place.
Phase 2 ships interactive versions with exportable results and shareable URLs. Phase 0 lists the tools and shows the formula. Pick your number, start there.
Tools that respect your intelligence.
Most financial calculators hide the math and ask for your email before showing you the answer. We think that is backwards.
No email walls, no popups
Every calculator at Fintiex is free to use without an account. You get the answer immediately, not after a signup flow. We believe the right to calculate your own mortgage payment is not a premium feature.
Formulas visible and editable
Each calculator shows the formula it uses and lets you adjust key assumptions. You can change the compounding frequency, tweak the amortization term, or add an extra monthly payment and immediately see how the output changes. This is how you build genuine financial intuition, not just get a number.
Back-of-the-envelope first
The default view shows the headline number in large type. The advanced view shows a full amortization table or month-by-month projection. Most people need the headline first. The detail is one tap away, not buried under a paywall.
What is coming in Phase 2
Phase 2 brings shareable result URLs, PDF export, side-by-side scenario comparison, and live rate pre-fill from our rate tables. The CD ladder calculator will support custom rungs and reinvestment assumptions. The mortgage calculator will support PMI auto-removal at 80% LTV and ARM adjustment scenarios.
Common questions.
Are my calculator inputs saved anywhere?
No. Fintiex calculators are entirely client-side. Nothing you enter is sent to a server or stored in a database. If you close the tab, your inputs are gone. We are exploring optional local-storage persistence for future versions.
Do I need an account to use the calculators?
No account, no email address, no signup. Every calculator on this page is free and fully accessible. We will never put a calculator behind a registration wall.
Can I export or share my results?
Not yet. Export to PDF and shareable URLs are on the Phase 2 roadmap. For now, you can screenshot the results panel or copy the key numbers from the output section.
How accurate are the estimates?
Estimates are mathematically correct given the inputs. The mortgage payment calculator uses standard amortization formulas. The compound interest tool uses the standard formula. The results are as accurate as your inputs: actual lender offers may differ based on credit score, fees, and terms not captured here.
Why is there no APY-to-monthly-rate toggle?
Showing monthly rates introduces a decimal place that obscures the comparison. We use APY or APR consistently throughout the site because those are the numbers on your actual offer letters. The goal is to match what you see in the real world, not add conversion steps.
Are the calculators mobile-friendly?
Yes. Every calculator is designed to work on phones and tablets. The input layout stacks vertically on small screens. Touch targets meet accessibility minimums. If you find a calculator that breaks on your device, email us at feedback@fintiex.com.
Run the numbers on your biggest financial decision right now.
No signup. No email. Just the math.