Answers
67 questions, answered with the actual numbers
Each page answers one question in its first sentence, then shows the working, a full table of variants, and the formula behind it. Nothing is rounded to a marketing figure and nothing is left as “it depends”.
These pages exist because most search results answer a numeric question with a paragraph of caveats and a lead form. Here the number comes first — Rs 26,035 a month for a Rs 30 lakh, 20-year home loan at 8.5%; Rs 12,75,000 of tax-free salary under the new regime; 23, not 25, as the Indian BMI overweight cut-off — and the reasoning comes after it.
Last reviewed 2026-10-16 (IST) · 67 answersLoans and EMI
What an instalment actually costs, and how much a lender will give you.
What is the EMI for a Rs 30 lakh home loan for 20 years?Rs 26,035 a month at 8.5% — plus the rate and tenure table.What is the EMI for a Rs 50 lakh home loan for 20 years?Rs 43,391 a month at 8.5% — and the salary it needs.What is the EMI for a Rs 10 lakh personal loan?Rs 22,244 a month over 5 years at 12%.How much home loan can I get on a Rs 50,000 salary?About Rs 28.81 lakh at 8.5% over 20 years.
Income tax, FY 2026-27
Worked slab by slab on the rates in force, with the old-regime comparison.
How much income tax on a Rs 12 lakh salary in India?Rs 0 under the new regime for FY 2026-27.How much income tax on a Rs 15 lakh salary in India?Rs 97,500 under the new regime for FY 2026-27.How much income tax on a Rs 20 lakh salary in India?Rs 1,92,400 under the new regime for FY 2026-27.How much salary is tax free in India?Rs 12,75,000 gross under the new regime, FY 2026-27.
Saving and investing
SIP, PPF and FD outcomes with the arithmetic shown, not just the headline rate.
What will a Rs 5,000 monthly SIP be worth after 10 years?About Rs 11.62 lakh at 12% — on Rs 6 lakh invested.How much SIP do I need to reach Rs 1 crore?About Rs 10,009 a month for 20 years at 12%.What is the PPF maturity amount on Rs 1.5 lakh a year for 15 years?About Rs 40.68 lakh, entirely tax free, at 7.1%.How much interest will I get on a Rs 10 lakh fixed deposit?About Rs 70,000 a year at 7%, before tax.
Health numbers
The cut-offs that apply in India, which are not always the international ones.
Is a BMI of 25 overweight?Yes internationally — and for Indians the line is 23, not 25.How many calories do I need to burn to lose 1 kg?About 7,700 kcal of cumulative deficit.
Everyday maths and units
The small calculations people look up over and over.
How many MB are in a GB?1,000 MB in a GB — but 1,024 MiB in a GiB.How do you calculate percentage increase?(New − Old) ÷ Old × 100.How many zeros are there in 1 crore?Seven — 1 crore is 10,000,000.How many lakhs is 1 million?Ten lakh — and 1 crore is 10 million.What is 5 feet 8 inches in cm?172.72 cm — with the full height table from 4′10″ to 6′6″.How many kg is 1 pound?0.4536 kg — and 1 kg is 2.2046 pounds.
Land and area, India
Bigha, gaj, cent, katha and acre — the units that change meaning at a state border.
How many square feet is 1 bigha?It depends on the state — from 6,804 sq ft in Uttarakhand to 27,225 in Haryana.How many square feet is 1 gaj?Exactly 9 square feet — a gaj is a square yard.How many square feet is 1 acre?43,560 square feet exactly — plus acre to cent, guntha, bigha and hectare.How many square feet is 1 cent of land?435.6 square feet — one hundredth of an acre.How many square feet is 1 katha?720 sq ft in West Bengal, 1,361 in Bihar, 2,880 in Assam.
Data, storage and speed
Where 1,000 and 1,024 disagree, and what a broadband plan really delivers.
How many KB are in 1 MB?1,024 to your computer, 1,000 to your hard-disk maker.What is the difference between Mbps and MBps?Eight times. Mbps is megabits, MBps is megabytes.How long does it take to download a 1 GB file?About 80 seconds on 100 Mbps, 13 minutes on 10 Mbps.
GST
Adding it, removing it, and the split between CGST, SGST and IGST.
How much GST is charged on Rs 1 lakh?Rs 18,000 at the standard 18% rate — total Rs 1,18,000.How do you remove GST from a total amount?Divide by 1.18, do not subtract 18% — the two are not the same.
Domains, WHOIS and DNS
Who owns a name, what its status codes mean, when it expires and where it is hosted.
How do I find out who owns a domain?Run a WHOIS or RDAP lookup — but expect the owner’s name to be redacted.Why does WHOIS say “Redacted for Privacy”?GDPR. Since May 2018 registrars publish the operational fields and hide the personal ones.What is RDAP, and how is it different from WHOIS?RDAP is the structured, authenticated replacement for WHOIS. Since 2025 it is the required one.What do domain status codes like clientTransferProhibited mean?They are EPP status codes — the locks and states a domain can be in.What happens when a domain expires?Roughly 75 days of decreasing options, then anyone can register it.How do I transfer a domain to another registrar?Unlock, get the auth code, start the transfer, approve the email. Five to seven days.How do I check if a domain name is available?WHOIS is the honest check. A registrar search box is a sales funnel.How long does DNS propagation take?As long as the old record’s TTL — usually minutes, not the mythical 48 hours.What is a name server, and how do I find mine?The servers that answer for your domain. WHOIS lists them; they tell you who really hosts you.How do I check how old a domain is?The creation date in WHOIS. It is the most useful trust signal a domain has.How do I find out who hosts a website?Name servers, then the IP’s network owner, then the certificate. Three lookups.Is WHOIS information public?Partly. The operational fields are public by contract; the personal ones are not.What is an MX record?The DNS record that says which server receives email for a domain.What is a CNAME record, and how is it different from an A record?A CNAME is an alias to another name; an A record is an address.What is TTL in DNS, and what should I set it to?Seconds a resolver may cache the record. 3600 normally, 300 before a migration.What is a TXT record used for?Free-form text in DNS — today it mostly carries SPF, DKIM, DMARC and ownership proofs.How long is an SSL certificate valid for?398 days until March 2026. Since 15 March 2026 the maximum is 200 days.Why is my SSL certificate not trusted?Usually a missing intermediate chain, a name that is not in the certificate, or a clock.What does my IP address reveal about me?Your ISP, your rough city and your connection type — not your name or address.What is a DNS A record?The record that maps a host name to an IPv4 address.What is the difference between IPv4 and IPv6?IPv4 addresses are 32-bit and ran out; IPv6 addresses are 128-bit and will not.What is a subdomain?A name added in front of a domain, given its own DNS records.How do I check the DNS records for a domain?Use a DNS lookup tool, or the dig / nslookup commands, to query each record type.What is a PTR record?The reverse-DNS record that maps an IP address back to a host name.What is DNSSEC and do I need it?Digital signatures on DNS answers, so a resolver can tell a forged answer from a real one.What is a CAA record?A DNS record naming which certificate authorities may issue certificates for a domain.How do I point a domain name to an IP address?Create an A record at your DNS host with the server’s IPv4 address, then wait out the TTL.What is a wildcard SSL certificate?One certificate covering every first-level subdomain of a domain, written *.example.com.What is an EPP code (auth code) and how do I get one?A secret one-time password that proves you own a domain when you move it to another registrar.How do I check the expiry date of an SSL certificate?Open the certificate details in the browser, or query the host directly and read the notAfter date.What is a private IP address, and why is mine 192.168.1.x?An address reserved for use inside a home or office network, never routed on the public internet.What is a TLD (top-level domain)?The last label of a domain name, such as .com, .in or .org, managed by a registry.What is HSTS (HTTP Strict Transport Security)?A response header that tells browsers to use HTTPS only for your domain for a set period.
Email authentication and deliverability
SPF, DKIM, DMARC and the records that decide whether your mail arrives.
What is an SPF record and how do I check mine?A TXT record listing who may send email as your domain. One record, ten lookups, max.What is DMARC and what should my policy be?The record that ties SPF and DKIM to the visible From address. Start at p=none.Why do my emails go to spam?Usually authentication. Check SPF, DKIM and DMARC before you touch the wording.What is DKIM and how does it work?A digital signature on every outgoing email, checked against a public key in DNS.
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