About 100Calculators.com - Your One-Stop Solution for All Calculations
100Calculators.com hosts a collection of over 100 free online calculators covering mathematics, finance, health, engineering, and lifestyle topics. The site serves students, professionals, and general users needing quick calculations without installation or signup. The calculators are curated from iCalculator and optimized for speed and ease of use, with each tool including formulas and topic explanations.
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Authority
—/100
Safety
90/100
Registered
Jun 3, 2023
3 years old · IONOS SE
1 of 2 safety checks passed (Sep 4, 2026).
AboutUs has not vetted this site. 1 of 2 automated safety check did not pass. Everything below is what we could measure automatically. Anything you do on the site — paying, sharing personal details, downloading — is between you and the site, not AboutUs.
Current facts
What AboutUs observed on the live site and in WHOIS/DNS today. These are measurements, not an endorsement of the site.
checked now
Domain registered Jun 3, 2023 — 3 years old.
checked now
Registrar today: IONOS SE — unchanged since AboutUs began tracking (Aug 9, 2026).
We withhold an authority number until independent evidence (global rank, link-graph presence) has accrued. The facts we do have about this site are shown below — we'd rather say “not enough signals yet” than invent a low score.
Safety evidence
Missing DMARC (mild)
Site history
Dated record — historical facts always carry their date.