🧮 Lots Of Calcs 🧮

A collection of everyday and business calculators.

General

Basic Calculator

Standard arithmetic with keyboard support.

Scientific Calculator

Trig, logs, powers and roots, with a DEG/RAD toggle.

Percentage Calculator

X% of Y, X as a % of Y, or the % change between two values.

Business & Analysis

Margin vs Markup

Cost + margin% or markup% → sell price, and back-solve either way.

YoY / MoM Growth

Feed in a monthly series, get month-on-month and year-on-year change.

Add or remove VAT, plus a progressive income tax band split.

A/B Test Significance

Control plus any number of variants → uplift, z-score and p-value for each.

Savings & Investing

Compound annual growth rate between a start and end value.

Compound Interest

Starting amount + annual return + years → what you'd end up with.

Goal + current savings + time frame → the monthly contribution you need.

Everyday

Bill + tip% + people → tip amount and per-person total.

Discount Calculator

Original price + % off → final price, including stacked discounts.

🧑‍🤝‍🧑

Equal split with tip%, or an itemized uneven split per person.

Score out of total → % and letter grade, plus weighted averages.

Length, weight, temperature and volume conversions.

Height + weight → Body Mass Index and category.

Fuel Cost / MPG

Distance, fuel price and efficiency → trip cost.

Household Bill Splitter

Add everyone's contribution %, list the bills, and split the total fairly.

Other

Birthday Calculator

Your exact age, day of the week born, and days until your next birthday.

Date Difference

Years, months and days between two dates.

Paint & Flooring Coverage

Room dimensions → how much paint or flooring you'll need.

Time Zone Converter

Convert a date and time between two time zones, DST included.