Conversion Tools — Free Online Tools
Fast unit converters: length, weight, temperature, area, volume, speed, time, energy, pressure, data storage. Type a value, see all units instantly.
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For when Google's converter is one extra click away.
A practical guide to conversion tools on DailyTool
In short: Fast unit converters: length, weight, temperature, area, volume, speed, time, energy, pressure, data storage. Type a value, see all units instantly.
Unit conversion is one of those things you need mid-task — cooking, homework, gym weights, visa forms, engineering assignments. You don't want an article about the history of the kilogram. You want 68kg in lbs, now.
So these are instant: type once, all units update together. No submit button, no page reload. Temperature handles the C/F/K math properly (it's not just multiplication), and data storage lets you switch binary vs decimal because yes, your 1TB drive showing 931GB is normal.
Who are these conversion tools for?
Everyday jobs these tools handle well
Students
Physics/chemistry numericals — cm/inch, joule/calorie, bar/psi without formula mistakes.
Home & kitchen
Cups/ml, kg/lbs, C/F for recipes from US/UK sites.
Plots & travel
Acre/sq ft, km/miles, litre/gallon for mileage and land papers.
How to get it right the first time
3 simple steps
Type in the unit you know
Any box works as input. Type 170cm or 68kg — everything else recalculates live.
Watch precision, not just digits
10 decimal places looks smart but means nothing for cooking. Round to 1-2 decimals for real life.
Double-check oven temps
Ovens vary by 10 degrees. If converting 350F, use 180C and check 5 mins early the first time.
Real situations where this helps
Taken from jobs people actually do
US recipe says 2 cups flour
Volume converter: 2 US cups is about 473ml / 240g flour (spooned). Don't convert cups to grams 1:1 for all ingredients — flour vs sugar differ.
Plot is 1200 sq ft, broker says gaj
Area converter: 1200 sq ft is about 133 sq yards (gaj). Useful when listings mix units in the same ad.
Phone shows 256GB, laptop shows 238GB
Same drive, different counting (decimal vs binary). Data converter shows both so you stop thinking something's wrong.
Mistakes people make (so you don't have to)
Quick things worth knowing before you start
Mixing US and UK gallons
US gallon (3.78L) is not UK gallon (4.54L) — 20% difference. Check which one your source uses for mileage claims.
Converting C to F by multiplying only
It's x9/5 + 32, not just x2. Use the tool instead of mental maths for oven temps.
Trusting 8-decimal conversions for construction
Tape measures don't do microns. Round to mm/cm for anything you build.
All conversion tools on DailyTool
10 free tools, no signup
- Length Converter
Convert between length units
- Weight Converter
Convert between weight units
- Temperature Converter
Convert between temperature scales
- Area Converter
Convert between area units
- Volume Converter
Convert between volume units
- Speed Converter
Convert between speed units
- Data Storage Converter
Convert between data storage units
- Time Converter
Convert between time units
- Energy Converter
Convert between energy units
- Pressure Converter
Convert between pressure units
Frequently Asked Questions
Questions people actually ask about conversion tools