Math Tools
Math utilities for students, engineers, and data folks: statistics (mean, median, std dev), combinatorics, prime factorization, sequence generators, and equation helpers. All local, no rounding surprises.
18 tools in this category.
Tools in Math Tools
Percentage Calculator
Three percentage tools in one: percent of a value, ratio as a percent, and percent change.
Calculators
Pressure Converter
Convert between pascal, bar, psi, atmosphere, mmHg, torr, and other pressure units instantly.
Converters
Energy Converter
Convert between joule, kilojoule, calorie, kilocalorie, watt-hour, kilowatt-hour, BTU, electron-volt, and more.
Converters
Power Converter
Convert between watt, kilowatt, megawatt, horsepower (mechanical and metric), BTU/h, and more.
Converters
Force Converter
Convert between newton, kilonewton, dyne, pound-force, kilogram-force, ounce-force, kip, and more.
Converters
Angle Converter
Convert between degrees, radians, gradians (gon), arcminutes, arcseconds, turns, and milliradians.
Converters
Fuel Consumption Converter
Convert between L/100km, km/L, MPG (US), and MPG (UK) — for cars, motorcycles, and any other vehicle.
Converters
Data Transfer Rate Converter
Convert between bits/second, bytes/second, kbps, Mbps, Gbps, kB/s, MB/s, GB/s, and more.
Converters
Random Number Generator
Pick a random number, roll dice, or shuffle a list. Cryptographically secure, runs locally.
Generators
Statistics Calculator
Compute mean, median, mode, range, variance, standard deviation, and quartiles from a list of numbers.
Math Tools
Permutation & Combination Calculator
Compute nPr and nCr, with optional listing of all arrangements or subsets. Bounded for huge counts.
Math Tools
Rental Yield Calculator
Calculate gross yield, net yield (cap rate), and cash-on-cash return for a rental property. Includes monthly cash flow and time to recoup.
Calculators
Loan Amortization Calculator
Generate a full month-by-month amortization schedule for any loan. See principal vs interest, total cost, and the full payment table.
Calculators
Overtime Pay Calculator
Calculate weekly pay with overtime. Supports US standard (1.5x after 40 hours/week) and California (1.5x after 8h/day, 2x after 12h/day).
Calculators
Rent vs Buy Calculator
Compare the total cost of renting vs buying a home over a time horizon. Accounts for mortgage, taxes, insurance, maintenance, appreciation, and opportunity cost of the down payment.
Calculators
Currency Converter
Convert between 30+ world currencies using static daily-refreshed rates. Fast, private, no API key, no tracking, works offline.
Calculators
Random Picker / Wheel of Names
Pick a random item from a list with a spinning wheel. Great for giveaways, classroom activities, and team decisions. Runs in your browser, no upload.
Generators
Coin Flip
Flip a virtual coin or roll dice. Cryptographically fair randomness, runs in your browser, history tracked per session.
Generators