Unit Converter
Fast, accurate unit conversion for length, weight, temperature, time & more
Every unit converter a student needs, in one hub. Do a quick conversion right here, or pick a category below for a dedicated tool โ no signup, no ads, no waiting.
Choose a converter
Length Converter
cm to m, m to km, km to mile, inch to cm & more
Mass & Weight Converter
kg to g, g to kg, kg to lb, lb to kg & more
Temperature Converter
ยฐC to ยฐF, ยฐF to ยฐC, ยฐC to K & more
Time Converter
sec to min, min to hr, hr to day & more
Speed Converter
km/h to m/s, mph to km/h & more
Pressure Converter
Pascal to atm, bar to Pa, psi to bar & more
Energy Converter
Joule to calorie, kWh to Joule & more
Power Converter
Watt to kW, HP to Watt, kW to HP & more
Area Converter
sq ft to sq m, acre, hectare, cent, ground & guntha
Volume Converter
litre to ml, gallon to litre, cup to ml & more
Physics calculators
Not a straight unit conversion โ these use a formula to solve for a missing value.
Ohm's Law Calculator
Find voltage, current, resistance or power
Speed, Distance & Time Calculator
Know any two, find the third โ with worked examples
Density Calculator
Find density, mass or volume โ plus float or sink check
More Calculators Coming soon
Percentage, number systems & more
Free Unit Conversion Tool for Students โ Length, Weight, Temperature, Time & More
Unit conversion shows up everywhere in schoolwork โ physics numericals that mix metric and imperial values, chemistry problems that need mass in grams instead of kilograms, geography questions about temperature, or maths problems built around time. Instead of hunting for a separate calculator for every unit pair, this hub brings together all of StudyHelpAI's unit converter tools in one place, plus a quick-convert box above for when you just need one number converted right now.
Each converter โ length, mass & weight, temperature, time, speed, pressure, energy, power, area and volume โ uses standard SI conversion factors and formulas, the same ones accepted in TN Board, CBSE, NEET and JEE numericals. That means results here match what examiners expect, not a rounded approximation from a generic calculator.
Every converter works the same simple way: pick your from and to units, type in a value, and get an instant result โ no signup, no app download, and no "convert" button to click. Popular conversion shortcuts are built into each tool so common pairs like cm to m, kg to lb, or ยฐC to ยฐF are just one tap away.
A physics unit converter built for numericals, not just generic conversion
Most generic unit converter tools aren't built with exam formats in mind. As a physics unit converter, StudyHelpAI's speed, pressure, energy and power tools use the exact SI units your physics numericals expect โ Joules, Pascals, Watts โ so a converted value drops straight into your working without extra rounding or unit-mismatch errors. Combined with the Ohm's law calculator (which solves for voltage, current, resistance or power using V = IR), this hub covers most of the unit and formula work that comes up in Class 9-12 physics, NEET and JEE.
As a general-purpose science unit converter, it's also useful outside physics: chemistry problems that switch between grams and kilograms or need temperature in Kelvin, and biology or geography questions that mix metric and imperial measurements. If you're stuck on the actual problem rather than just the units, StudyHelpAI's chemistry and physics homework solvers can walk through the full solution step by step.
Area and volume converters, including Indian land units
The area converter handles sq ft, sq m, acre and hectare, and also covers Cent, Ground and Guntha โ the land units used in everyday property talk across Tamil Nadu, Kerala, Karnataka and Andhra Pradesh that most converters leave out. The volume converter covers ml, litres, cubic metres and gallons for chemistry and maths, plus a cooking tab that turns cups, tablespoons and teaspoons into ml.
Physics calculators for formula-based problems
When you know two values and need the third, use the speed, distance and time calculator, the density calculator (mass, volume and density, with a float-or-sink check) or the Ohm's law calculator. Each one includes worked examples so you can see the method, not just the answer.
If you need a conversion that isn't listed yet, StudyHelpAI's free solver can work it out for you directly.
Unit converters โ common questions
StudyHelpAI offers length, mass & weight, temperature, time, speed, pressure, energy, power, area and volume converters, plus Ohm's law, speed-distance-time and density calculators.
Yes. The area converter includes Cent, Ground and Guntha along with acre, hectare, sq ft and sq m, so you can convert land measurements used in Tamil Nadu, Kerala, Karnataka and Andhra Pradesh without doing the maths by hand.
Yes, every converter and calculator on StudyHelpAI is completely free, with no signup, no app download and no usage limits.
Yes โ all converters use standard SI conversion factors and formulas, the same values accepted in TN Board, CBSE, NEET and JEE numericals.
Yes. The length converter handles cm/m/km alongside inches/feet/miles, the mass converter handles kg/g alongside pounds and ounces, and the speed converter handles km/h alongside mph, so you can move freely between both systems.
Converters translate a value from one unit to another, like kg to lb. Calculators, like the Ohm's law calculator, use a formula to work out a missing quantity from two known values, such as finding resistance from voltage and current.
Yes. As a physics unit converter, the speed, pressure, energy and power tools use the exact SI units expected in Class 9-12 numericals, NEET and JEE. As a general science unit converter, it also covers the metric-to-imperial and mass/temperature conversions that come up in chemistry, biology and geography problems.
More converters and calculators are being added regularly. In the meantime, you can ask StudyHelpAI's free solver directly for any conversion or calculation you need.