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 toolAge & Date Calculator
Find calendar age and the number of days between two dates.
CalculatorsOpen toolBreak-Even Analysis Planner
Find break-even sales, target-profit volume and margin of safety, with price sensitivity scenarios.
CalculatorsOpen toolCash Flow Forecast Planner
Forecast recurring cash movements and one-off events, compare a stress scenario and find future cash gaps.
CalculatorsOpen toolConstruction Materials Calculator
Estimate material quantities from dimensions, coverage and wastage.
CalculatorsOpen toolDebt Payoff Planner
Debt Payoff Planner. Enter your own figures, review the method and download a local financial report.
CalculatorsOpen toolElectricity Consumption Calculator
Add appliances and calculate energy use plus cost at your entered rate.
CalculatorsOpen toolFractions Solver & Practice
Add, subtract, multiply and divide exact fractions with common-denominator explanations, visual fraction bars and independent practice.
CalculatorsOpen toolFuel Consumption and Trip Cost Calculator
Estimate trip fuel and cost from distance, consumption and your fuel price.
CalculatorsOpen toolGPA and Mean Grade Calculator
Calculate weighted marks and GPA using your institution’s grading scale.
CalculatorsOpen toolHousehold Budget Planner
Household Budget Planner. Enter your own figures, review the method and download a local financial report.
CalculatorsOpen toolInventory Reorder Planner
Calculate safety stock, reorder levels and economic order quantities with pack-size rounding.
CalculatorsOpen toolLand Area Converter
Convert land measurements between acres, hectares and other area units.
CalculatorsOpen toolLoan Offer Comparison
Loan Offer Comparison. Enter your own figures, review the method and download a local financial report.
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 toolLoan Repayment Calculator
Loan Repayment Calculator. Enter your own figures, review the method and download a local financial report.
CalculatorsOpen toolMargin & Markup Calculator
Explore a live selling-price breakdown, compare margin and markup, or work backwards from a target percentage.
CalculatorsOpen toolMeeting Cost Calculator
Measure attendee time, preparation and recurring meeting costs, then see the effect of shorter sessions.
CalculatorsOpen toolNumber to Words
Turn a number into English words or Kenya shillings wording.
CalculatorsOpen toolPercentage Calculator
Calculate percentages, compare a change or combine weighted exam marks.
CalculatorsOpen toolProject Cost Estimator
Build a detailed project budget with materials, labour, overhead, contingency and a target-margin quote.
CalculatorsOpen toolRent and Prorated Payment Calculator
Calculate rent for part of a month, then add deposits or split the amount.
CalculatorsOpen toolSACCO Loan & Eligibility Planner
SACCO Loan & Eligibility Planner. Enter your own figures, review the method and download a local financial report.
CalculatorsOpen toolSavings Goal Calculator
Savings Goal Calculator. Enter your own figures, review the method and download a local financial report.
CalculatorsOpen toolScientific and Graphing Calculator
Evaluate scientific expressions and plot functions over your chosen range.
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 toolStep-by-Step Algebra Solver
Solve, understand and practise algebra with exact fractions, real quadratic roots, verified working, linear inequalities and two-equation problems.
CalculatorsOpen toolSubscription Cost Audit
Subscription Cost Audit. Enter your own figures, review the method and download a local financial report.
CalculatorsOpen toolTime Zone Converter
Convert a date and time between named zones, with daylight-saving checks.
CalculatorsOpen toolUnit Converter
Convert length, mass, area and temperature with clearly labelled units.
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11 tools with their own source snapshots are listed separately from the main toolkit. Open the reference tools.