Free Unit Converter: Metric, Imperial and Indian
Convert units free including Indian land measures — bigha, guntha, cent — that global tools get wrong.
Standard unit converters handle metres and feet perfectly well and fall apart the moment you need bigha, guntha, cent or katha. These units are used daily in Indian property transactions, and their values differ by state — a bigha in Rajasthan is not a bigha in West Bengal. A converter that reports a single global figure for bigha is giving you a number that may be wrong where you live.
Why a free unit converter matters more in India
This matters because land measurement is where the money is. Property listings, agricultural records and municipal documents across India use traditional units interchangeably with metric ones, and conversion errors in that context are expensive rather than academic. A plot advertised in bigha, recorded in hectares on the revenue document and discussed in square feet by the broker is entirely normal, and reconciling those three figures is how you discover whether the stated area is real. Meanwhile the everyday conversions people actually need — currency, temperature, cooking measures — are handled free by tools already on their devices, which is why the dedicated converter website is largely a solved problem dressed up as an unsolved one.
The best free options compared
At a glance
Of the 4 options below, 3 are fully free with no paid tier to upgrade to, and 1 offers a free tier alongside paid plans. That distinction matters more than it first appears: a fully free tool cannot restrict you later, whereas a free tier is a commercial decision that can be revised.
| Tool | Cost | Best for |
|---|---|---|
| Google Search | Fully free | Typing a conversion directly into the search bar handles length, weight, volume,… |
| Your phone's calculator | Fully free | Both iOS and Android include unit conversion in the built-in calculator or utilities app |
| State revenue department resources | Fully free | authoritative source for land unit conversions in your specific state |
| Wolfram Alpha | Free tier | Handles unusual, compound and scientific conversions that simpler tools miss |
Each option in detail
Google Search
✓ FREETyping a conversion directly into the search bar handles length, weight, volume, temperature, currency and more, instantly and free. For the overwhelming majority of conversions this is faster than any dedicated site and requires nothing.
Your phone's calculator
✓ FREEBoth iOS and Android include unit conversion in the built-in calculator or utilities app. Works offline, which matters when you are standing on a plot of land with poor signal.
State revenue department resources
✓ FREEThe authoritative source for land unit conversions in your specific state. Since bigha and katha vary regionally, official state figures are the only ones worth relying on for anything transactional.
Wolfram Alpha
◐ FREEMIUMHandles unusual, compound and scientific conversions that simpler tools miss. Free for ordinary queries and genuinely capable on complex ones.
Note on free tiers: limits and features change often. Everything here was checked in July 2026, but confirm current terms on the provider's own site before committing to a workflow. Official guidance: UGC National Digital Library of India.
How to choose the right one
For everyday conversions, use Google or your phone — dedicated converter sites add nothing except advertisements. For Indian land units, do not trust a generic converter: check your state revenue department's stated equivalence, because the same unit name genuinely means different areas in different states. For scientific or compound units, Wolfram Alpha is the most reliable free option.
If you are assembling a wider free toolkit, these related guides cover adjacent problems: Free Plagiarism Checker for Students in India, Free Grammar Checker for Indian English Writing, Free Citation Generator: APA, MLA and IEEE.
Verdict
You almost certainly already have the best free unit converter available. The exception worth taking seriously is Indian land measurement, where regional variation makes generic tools actively misleading and the state's own figure is the only one that counts.
🎓 Explore more free student tools
Browse every verified-free tool we have tested in this category.
See all Student Tools →Frequently asked questions
How many square feet in one bigha?
It varies substantially by state — bigha is not a standardised unit, and values differ across Rajasthan, Uttar Pradesh, West Bengal and elsewhere. Check your state revenue department's official conversion rather than a generic online figure.
What is the best free unit converter app?
For most needs, none — your phone's built-in calculator and Google Search cover ordinary conversions offline and free. Dedicated apps add advertisements more than capability.
How do I convert guntha to square feet?
Guntha is used mainly in Maharashtra, Karnataka and neighbouring states and has a defined equivalence, but confirm against local revenue records for any transaction, since documented local practice governs.
Do unit converters work offline?
Phone calculator conversions do. Web-based converters and Google Search require a connection, which is worth remembering when checking measurements at a site with poor coverage.