Simple tools. Instant answers.

QR Code Generator

Create static QR codes for URLs, Wi-Fi, text, email, SMS and contacts. Download PNG or SVG in your browser — no signup.

Percentage Calculator

Calculate percentages three ways: find a percentage of a number, find what percent one number is of another, or find the total when you know a part and a percentage.

Days Between Dates

Count how many calendar days separate two dates, including the week-and-remainder breakdown.

Age Calculator

Calculate age in years, months and days from a birth date to today or to any target date.

CM to Inches

Convert centimeters to inches instantly using the exact 2.54 cm/inch definition.

KG to LBS

Convert kilograms to pounds using the exact international avoirdupois pound of 0.45359237 kg.

C to F

Convert Celsius to Fahrenheit with the exact formula F = C × 9/5 + 32.

KM to Miles

Convert kilometres to international miles using the exact 1 609.344 metre mile.

Fuel Cost

Estimate litres used, trip fuel cost and cost per kilometre from distance, L/100 km and price per litre.

EV Charging Cost

Estimate battery energy added, grid energy and charging cost from capacity, start/target %, price and efficiency.

Word Counter

Count words, characters, sentences and paragraphs in your browser. Text never leaves this page.

Math

Percentages, roots, fractions, logs and other everyday math made instant.

Statistics

Standard deviation, probability, sample size, z-scores and other everyday stats tools.

Geometry

Area, volume, triangles, circles and distance — with length, area and volume units kept separate.

Fitness

BMI, BMR, calories, pace and training estimates from published formulas — not medical advice.

Date & Time

Calculate dates, ages, durations and business days without touching a spreadsheet.

Conversions

Convert length, weight, temperature, volume and power between common units.

Energy

Estimate electricity, appliance and EV charging costs before you pay the bill.

Automotive

Fuel cost, fuel economy and trip cost tools for drivers.

Utilities

Password, UUID, encoding, JSON, hash and other tools that run locally.

Text

Word counts, character counts and other text utilities that run locally.

Developer

Unix timestamp conversion and other small lookups developers reach for often.

Password Generator

Create a strong random password in your browser. No signup, and the password is never stored or sent to analytics.

UUID Generator

Generate one or many RFC 4122 UUID v4 values in your browser. Copy or download as TXT.

JSON Formatter

Pretty-print, minify or validate JSON in your browser. Parse errors show an approximate line and column.

QR Code Generator

Create static QR codes for URLs, Wi-Fi, text, email, SMS and contacts. Download PNG or SVG in your browser — no signup.

Hash Generator

Hash text with SHA-256, SHA-384 or SHA-512 in your browser. Output is lowercase hex. Hashing is not encryption.

Color Converter

Convert colors between HEX, RGB and HSL with a live preview. Accepts #RGB and #RRGGBB.

Scientific Calculator

Evaluate expressions with powers, roots, logs, factorials and trigonometry in degrees or radians.

Triangle Calculator

Find a triangle’s area, perimeter and angles from three sides, or the area from base and height or SAS.