Calculators
Pick what you are working out. Every calculator uses your own numbers and runs on your device.
Quick sums
Everyday answers in a few seconds.
Percentage
Percentages, changes and weighted marks.
Instant answerOpen toolUnit converter
Length, mass, area and temperature.
Instant answerOpen toolAge and dates
Exact age, or the days between two dates.
Instant answerOpen toolNumber to words
Write an amount in words or Kenya shillings wording.
Copy resultOpen toolTime zones
Convert a time between places, with daylight saving checked.
Copy resultOpen toolLand area
Acres, hectares and other land units.
Copy, print or PDFOpen toolLoans and debt
See the full cost before you sign, and the fastest way out.
Loan repayment
Monthly payments, interest, fees and a full schedule.
Schedule CSV, print or PDFOpen toolSACCO loan
Repayments and fees, with your savings deductions.
Schedule CSV, print or PDFOpen toolCompare two loans
Which offer costs less once fees and extra payments count.
Download CSV schedulesOpen toolPay off debts
Snowball or avalanche: the order that clears your debts sooner.
Download CSVOpen toolHousehold money
Budgets, bills and goals for the month ahead.
Monthly budget
Income, bills and savings on one page.
Download CSVOpen toolSavings goal
How much to put aside each month to reach a target.
Schedule CSV, print or PDFOpen toolRent for part of a month
Prorate rent, then add a deposit or split the amount.
Schedule CSV, print or PDFOpen toolElectricity use
What each appliance costs at your tariff.
Schedule CSV, print or PDFOpen toolFuel for a trip
Fuel needed and its cost for any distance.
Copy, print or PDFOpen toolSubscriptions
What your subscriptions cost a year, and what cancelling saves.
Download CSVOpen toolBusiness numbers
Prices, stock, cash and quotes for your business.
Margin and markup
Profit, margin and markup from your cost and price.
Chart and chart dataOpen toolBreak-even
Sales needed to cover costs, and your margin of safety.
Download CSVOpen toolCash flow
Spot the months where cash runs short.
Download CSVOpen toolStock reorder
When to reorder and how much, with safety stock.
Download CSVOpen toolProject quote
Materials, labour and overhead turned into a quote with your margin.
Download estimate CSVOpen toolBuilding materials
Quantities from dimensions, coverage and wastage.
Print or save as PDFOpen toolMeeting cost
What a meeting costs in people’s time.
Download CSVOpen toolDecision matrix
Score options against the criteria that matter to you.
Download CSVOpen toolStudy and maths
Marks, equations and graphs.
More tools
Fractions Solver & Practice
Add, subtract, multiply and divide exact fractions with common-denominator explanations, visual fraction bars and independent practice.
CalculatorsOpen toolLoan Refinancing & Early Settlement Comparator
Loan Refinancing & Early Settlement Comparator. Enter your own figures, review the method and download a local financial report.
CalculatorsOpen toolSimultaneous Equations Solver
Solve two linear equations in x and y using elimination, exact fractions and checks in both original equations.
CalculatorsOpen toolSmart Maths & Learning
Choose a maths topic, work through an explained solution and practise independently with optional device-only progress.
CalculatorsOpen toolNo tools match these filters
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11 tools with their own source snapshots are listed separately from the main toolkit. Open the reference tools.