Compound interest, savings, investment returns, salary comparison.
6 calculators →
Mortgage payments, home affordability, rental property ROI.
4 calculators →
BMI, metabolic health, biohacking cost, longevity, carbon footprint.
8 calculators →
Pet costs, wedding budget, divorce, maternity leave, AI risk, P(doom).
17 calculators →
H-Index, G-Index, career projection, P(doom) — for researchers.
12 calculators →See exactly how your money grows. Principal, rate, frequency, contributions — full amortization.
Monthly payments, total interest, full amortization schedule for any loan.
Measure your research impact instantly. Paste citation counts, get your H-Index and G-Index.
Body Mass Index with WHO categories. Metric and Imperial. Includes waist-to-height ratio.
How much house can you actually afford? Based on income, debts, and down payment.
Estimate your annual CO₂ emissions from transport, energy use, diet, and lifestyle.
Annual and lifetime costs of pet ownership — dog, cat, rabbit and more.
How much does your peptide & biohacking protocol actually cost per month & per year?
Healthspan projector, bio-aging reversal checker, and longevity progress tracker.
Calculators without
the clutter.
Most calculator sites are filled with ads, dark patterns, and tools designed for engagement metrics rather than actual answers. We built Calcuja for the opposite — clean interfaces, honest results, zero monetization tricks.
No premium tiers. No ad trackers. No cookie walls interrupting your work.
No page reloads. Your data never leaves your device. Results appear as you type.
Each tool is designed around an actual question you're trying to answer — not to maximise session time.
Frequently Asked Questions
Is Calcuja really free?
Yes. All 40+ calculators are completely free with no ads, no paywalls, and no login required. There are no premium tiers or hidden features — every tool works fully for everyone.
Do I need to create an account?
No account needed. Just visit any calculator page and start calculating. Your inputs stay in your browser — nothing is sent to a server or stored online.
What types of calculators does Calcuja offer?
Calcuja offers 40+ calculators across 5 categories: Financial (compound interest, mortgage, investment), Property (mortgage, home affordability, rental ROI), Health (BMI, metabolic health, biohacking cost, longevity), Personal (pet costs, wedding budget, salary comparison), and Academic (H-Index, G-Index, career projection).
Are the calculations accurate?
All calculators use standard, well-documented formulas. Financial calculators use standard amortization and compound interest formulas. Health calculators use WHO and NIH published thresholds. Academic calculators use the original H-Index, G-Index, and i10-Index definitions from their respective papers.
Can I share my calculator results?
Yes. Every calculator has a "Share" button that copies a URL with your inputs encoded. Anyone who opens that link sees the same calculation — useful for sharing with family, advisors, or colleagues.
Does Calcuja track my data?
No. All calculations happen client-side in your browser. We use privacy-friendly analytics (Matomo) with consent mode — you choose whether to opt in. Your calculator inputs are never transmitted or stored on our servers.