BTU Calculator for Air Conditioners
Estimate the right BTU/h size for a bedroom, living room, office or kitchen using room area, people and sun exposure.
Tools
Tools
Choose a tool, fill in the fields and generate the result. Pages are short, clear and focused on the task.
Tile Calculator
Calculate floor area, tile count, waste allowance and estimated boxes for flooring or wall tile.
Triangle Calculator
Calculate area, perimeter, semiperimeter, angles, and triangle type from three side lengths.
Present Value Calculator
Calculate the present value of a future amount using annual rate, time horizon and compounding frequency.
Minecraft Nether Portal Calculator
Convert Overworld and Nether coordinates with an ideal portal suggestion and a ready-made /tp command.
Line Filter by Word or Space Count
Remove or keep lines based on the number of words or spaces they contain.
Logarithm Calculator
Calculate logarithms from a value, a base and a chosen decimal precision.
Pregnancy Calculator
Calculate gestational age, trimester, approximate month and due date from the last menstrual period.
Confidence Interval Calculator
Calculate a confidence interval, margin of error and standard error from sample mean, standard deviation and sample size.
Minecraft Stack Calculator
Convert item counts into full stacks and leftovers with a custom stack size.
Shoe Size Converter
Convert adult sizes between BR, US, UK, EU and JP with a practical reference table.
Density Calculator
Calculate density from mass and volume with automatic conversion across common units.
Heat Index Calculator
Estimate how hot it feels from air temperature and relative humidity.
AI Token Cost Calculator
Estimate tokens, words, characters and API costs for GPT-5.5, Claude and Gemini in one place.
LCM Calculator
Find the least common multiple of two or more integers and review the calculation steps.
Online Dice Roller
Roll d4, d6, d8, d10, d12, d20 or formulas like 2d6+3 right in your browser.
Concrete Calculator
Estimate concrete for slabs, footings, walls, round columns and post holes with waste allowance built in.
Inflation Calculator
Adjust amounts with compounded annual inflation and see the updated price, total increase and remaining buying power.
GCD Calculator
Find the greatest common divisor of two or more integers and review the calculation steps.
Long Division Calculator
Solve whole-number division and review quotient, remainder and long division steps.
Binary Calculator
Add, subtract, multiply and convert binary and decimal integers in your browser.
Hexadecimal Calculator
Add, subtract, multiply, or divide hexadecimal numbers and view the result in hex, decimal, and binary.
Permutation and Combination Calculator
Calculate nPr and nCr to compare ordered arrangements and unordered selections.
Monthly Budget Calculator
Track income, fixed bills, variable spending and a savings goal to see your true monthly balance.
Rounding Calculator
Round numbers to decimal places, whole numbers, tens, hundreds, thousands, or a custom step.
Scientific Notation Calculator
Convert decimal numbers and scientific notation with chosen significant figures.
Sales Tax and VAT Calculator
Calculate pre-tax price, tax amount and final total using a manual sales tax or VAT rate.
Ohm's Law Calculator
Calculate voltage, current, resistance and power from any two known electrical values.
Right Triangle Calculator
Calculate the hypotenuse, missing leg, area, perimeter and angles of a right triangle.
Download Time Calculator
Estimate how long a download or upload may take based on file size and connection speed.
How to choose the right tool
Use search when you already know the task name and browse tags when you want to compare similar options. Public pages are organized for quick decisions, review and small workflows.
What to check before picking one
Check whether the tool matches the unit, format or context of your task. When more than one option looks similar, compare the summary, fields and related links before you commit to one.