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Unit Converters Tools

Every unit converters tool on Online Tool Store, in one place. Runs entirely in your browser — nothing is ever uploaded.

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Altitude Baking Adjuster

Quick, free Altitude Baking Adjuster in your browser

Aquarium Volume Calculator

Quick, free Aquarium Volume Calculator in your browser

AR Marker Size Calculator

Quick, free AR Marker Size Calculator in your browser

Concrete Mix Ratio Converter

Quick, free Concrete Mix Ratio Converter in your browser

Drill Bit Size Converter

Quick, free Drill Bit Size Converter in your browser

T-Shirt Size Collector

Quick, free T-Shirt Size Collector in your browser

Horsepower Type Converter

Quick, free Horsepower Type Converter in your browser

Screw Thread Size Converter

Quick, free Screw Thread Size Converter in your browser

Shaft Diameter Calculator

Quick, free Shaft Diameter Calculator in your browser

Supports Material Estimator

Quick, free Supports Material Estimator in your browser

Curtain Length Calculator

Quick, free Curtain Length Calculator in your browser

Luminance Converter

Convert luminance units for display and lighting work

Capacitance Converter

Convert farads across common capacitance units

Pixel to Inch Converter

Convert screen pixels using a DPI value

Hat Size Converter

Convert head circumference to hat sizes

Bra Size Converter

Compare bra sizes by region

Pressure Converter

Convert common pressure units

Energy Converter

Joules, calories, kWh and BTU

Area Converter

Square meters, acres, hectares and square feet

Current Converter

Convert electrical current units

Voltage Converter

Convert between voltage units

Power Converter

Convert between watts, kilowatts, and horsepower

Torque Converter

Convert between Newton-meters and foot-pounds

Length Converter

Convert meters, feet, inches, miles and more

Weight Converter

Convert kg, pounds, ounces, stones

Volume Converter

Liters, gallons, cups and milliliters

Frequency Converter

Hz, kHz, MHz, GHz and RPM

Speed Converter

km/h, mph, knots and meters per second

Roman Numeral Converter

Convert numbers and Roman numerals both ways

Height Converter

Feet and inches to centimeters

Shoe Size Converter

US, UK, EU and CM shoe sizes

Data Transfer Rate Converter

Mbps, MB/s and download time context

Radiation Unit Converter

Convert Sievert, rem, Gray, and rad dose units

Wind Speed Converter

Convert wind speed across five units and Beaufort force

Temperature Converter

Celsius, Fahrenheit and Kelvin conversion

Density Converter

kg/m3, g/cm3 and lb/ft3

Ring Size Converter

US, UK and EU ring sizes with mm

Clothing Size Converter

Convert sizes between US, UK, and EU

Font Size Converter

Convert px, pt, em, rem, and percent

Luminosity Converter

Convert between lumens, candela, lux, and foot-candles

Mileage Unit Converter

Convert MPG (US/UK), L/100km, and km/L

Viscosity Converter

Convert dynamic viscosity units instantly

Angle Converter

Degrees, radians and gradians

Number to Words Converter

Numbers spelled out, including lakh and crore

Data Size Converter

Bytes, KB and KiB, with the drive-label gap explained

Time Unit Converter

Seconds, minutes, hours, days, years

Oven Temperature Converter

Fahrenheit, Celsius and gas marks, with the real dial setting

Byte Size Calculator

Both unit systems side by side, so 1 TB vs 931 GB makes sense

Paper Size Guide

A4, Letter, Legal dimensions in all units

Force Converter

Convert between force units

Fuel Economy Converter

MPG to L/100km and km/L

Currency Denomination Counter

Count cash totals from note quantities

Gold Weight Converter

Grams, troy ounces, tolas and carats

Parts Per Converter

Convert between percent, ppm, ppb, and ppt

Reactive Power Converter

Convert between VAR, kVAR, and MVAR

Reactive Energy Converter

Convert between VARh, kVARh, and MVARh

Volumetric Flow Rate Converter

Convert between L/min, m3/h, gal/min, and ft3/min

Charge Converter

Convert between coulombs, amp-hours, and mAh

Leak Loss Calculator

Estimate water lost through a leak

Plaster and Render Calculator

Estimate plaster or render quantities

Deck Board Calculator

Count deck boards, joists, and fixings

Duct Size Calculator

Size ventilation duct for a given airflow

EV Charging Time Calculator

Estimate how long a charge will take

Wheel Offset Calculator

Compare wheel offset, width, and clearance

Scale Model Converter

Scale model conversion examples for common kit scales

Battery Charge Manager

Plan charge limits that extend battery life

Irrigation Requirement Calculator

Work out run times for an irrigation zone

Drywall Sheet Calculator

Count plasterboard sheets, screws, and tape

Formwork Area Calculator

Measure the contact area of concrete formwork

Pesticide Dilution Calculator

Mix spray concentrate to the correct rate

Rebar Weight Calculator

Calculate rebar weight from bar size and length

Insulation R-Value Calculator

Calculate total assembly R-value from layers

Asphalt Tonnage Calculator

Estimate asphalt tons for a paving area

Antenna Gain Converter

Convert antenna gain between dBi and dBd

Fertilizer Application Calculator

Calculate fertilizer amount needed per area

Local Land Unit Converter

Convert between local and metric land area units

Pipe Volume & Flow Calculator

Calculate a pipe's volume and flow rate

Rafter Length Calculator

Calculate rafter length from span, rise, and overhang

Retaining Wall Calculator

Estimate retaining-wall blocks, gravel, and backfill

Lab Unit Converter

Convert common lab measurement units

Material Wastage Calculator

Add a realistic wastage allowance to a material order

Cable Tray Fill Calculator

Calculate cable tray fill percentage against code limits

Tire Wear Estimator

Estimate tire wear rate and miles remaining

Chain & Sprocket Calculator

Sprocket & chain calculator: ratio, length, speed

Metal Purity Converter

Convert between karat, fineness, and percentage purity

Wire Gauge (AWG) Converter

Convert AWG wire gauge to mm, area, and ampacity

Firewood Volume Converter

Convert firewood between cords, cubic meters, and stacks

Pool Volume Calculator

Compute swimming pool volume from shape and dimensions

Suitcase Volume Calculator

Calculate suitcase volume in liters and cubic inches

Torque to Horsepower Converter

Convert torque and RPM into horsepower

Baking Pan Size Converter

Swap pan sizes without changing your recipe

Nautical Unit Converter

Convert knots, nautical miles, and fathoms

Helmet Size Converter

Convert helmet sizes by head measure

Ring Stone Carat to MM Converter

Convert stone carat to millimeters

Mattress Size Converter

Convert mattress sizes between US, UK, and metric names

Baking Temperature Converter by Oven Type

Convert a baking temperature between conventional, fan, and gas mark

Firewood BTU Comparator

Compare heat output between firewood species

Firewood Moisture Content Converter

Convert firewood moisture readings between wet and dry basis

Kitchen Scale Ingredient Density Converter

Convert a recipe's cup measurement to grams