Questions worth exploring.
Compare your salary to the wealth of the world's richest people. Updated September 2026.
Calculate your H-Index from citations or live OpenAlex data, then benchmark it against your field.
They earn your annual income in seconds. See exactly how long it takes.
Calibrate your own P(doom) estimate against 50+ published expert forecasts.
Convert real currency to Gold Dragons, Galactic Credits, Galleons and 11 more fictional economies.
Four clusters. Forty-plus calculators.
Billionaire wealth, salary gaps, and the scale of extreme fortune.
Billionaire Time, Salary Comparison →H-Index, G-Index, i10-Index, citation benchmarks, and career projection.
10 academic tools →P(doom) estimation, expert surveys, and AI alignment analysis.
P(doom), AI Risk Survey →Fictional currency exchange, doomsday prep, and unusual quantitative questions.
14 fictional currencies →
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).
18 calculators →
H-Index, G-Index, career projection, citation impact — for researchers.
10 calculators →Original research and datasets.
50+ public P(doom) estimates from researchers, CEOs, and forecasters — aggregated and analyzed.
Field-level H-Index distributions by career stage — derived from OpenAlex and published literature.
Exchange rates for 14 fictional currencies, estimated from lore, purchasing power, and in-world economics.
Calculators without
the clutter.
Most calculator sites prioritize ads and engagement over answers. We built Calcuja differently: clean interfaces, standard formulas shown on-page, and zero monetization.
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 four thematic clusters — Wealth & Scale, Research & Academia, AI & Future, and Fantasy & Curiosity — plus five traditional categories: Financial, Property, Health, Personal, and Academic. The site also publishes original research datasets including the AI Risk Survey and H-Index Benchmarks.
Are the calculations accurate?
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. Every page shows the formula and a worked example.
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.