Calculator
Read a basic calculation correctly, use brackets and understand what the percent key does.
Inputs, example and limits →Core-tool guide · release status on overview
Learn the task before you enter a value
27 familiar tools, explained clearly.
Focused guides to inputs, formulas, worked examples and common mistakes. These are educational previews of the native Android update, not browser calculators or a claim that the update is downloadable.
Numbers
Percentage
Choose between finding a percentage of a number, percentage change and a part’s share of a total.
Inputs, example and limits →Average & totals
Enter a list of numbers and check the arithmetic mean alongside count, total, minimum and maximum.
Inputs, example and limits →Proportion
Solve one clearly defined ratio equation while keeping the positions of the known values straight.
Inputs, example and limits →Fraction calculator
Add, subtract, multiply or divide two whole-number fractions with a simplified exact result.
Inputs, example and limits →Number base converter
Convert signed whole numbers exactly between four positional bases without prefixes or two’s-complement assumptions.
Inputs, example and limits →Shopping
Discount & tax
Apply one percentage discount, then tax on the discounted price, with each step visible.
Inputs, example and limits →Compare prices
Compare price per gram, litre or item without confusing pack size with value.
Inputs, example and limits →Profit margin
Separate profit, margin on selling price and markup on cost.
Inputs, example and limits →Tax / VAT
Distinguish adding tax to a net amount from removing tax already included in a total.
Inputs, example and limits →Two discounts
Apply a second discount to the already discounted price and optionally add tax afterwards.
Inputs, example and limits →Money
Split a bill
Divide a bill and optional tip while making any one-cent remainder explicit.
Inputs, example and limits →Loan payment
Estimate a fixed monthly payment from principal, an annual rate and a term in months.
Inputs, example and limits →Savings goal
Estimate how many whole monthly contributions remain, without assuming investment returns.
Inputs, example and limits →Compound savings
Explore a constant annual-rate assumption with monthly compounding and month-end contributions.
Inputs, example and limits →Simple interest
Estimate interest on the original principal without compounding or monthly deposits.
Inputs, example and limits →Everyday
Unit converter
Convert fixed units across 10 groups and distinguish decimal from binary storage units.
Inputs, example and limits →Days between dates
Choose whether to count both dates and see how leap days affect a date interval.
Inputs, example and limits →Age calculator
Find completed years with a months-and-days remainder for an explicit comparison date.
Inputs, example and limits →Add days to a date
Find a date before or after a selected date using a signed whole-day count.
Inputs, example and limits →Area & perimeter
Choose a shape and enter only its required dimensions, using one length unit throughout.
Inputs, example and limits →Volume
Calculate ideal geometric volume from dimensions in one unit, with cubic units made explicit.
Inputs, example and limits →Add / subtract time
Combine elapsed durations, normalise overflowing minutes and retain the sign of a difference.
Inputs, example and limits →Work
Work hours
Calculate a single shift’s paid duration and optional gross-pay estimate without payroll assumptions.
Inputs, example and limits →Travel
Trip fuel cost
Estimate fuel needed and fuel cost from kilometre distance and kilometres per litre.
Inputs, example and limits →Travel time
Estimate duration from kilometres and a positive average speed without a route or traffic lookup.
Inputs, example and limits →Fuel economy
Turn measured trip distance and fuel used into two common efficiency measures.
Inputs, example and limits →Use the right level of detail
The candidate bundles everyday calculations in one native app. Version 1.4.0 includes daily currency references, not live exchange quotes. Legal tax-rate decisions, scientific graphing and personalised financial advice are not provided. Each guide explains its own limits rather than promising to replace every specialist app.
Review the full app scope →