Calculator Tools
Private calculators for money, dates, comparisons and everyday estimates, with clear formulas, useful controls and a combined workspace.
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Free. No sign-up required.Calculator Workspace
All 20 calculators in one workspace: money, dates, comparisons and everyday estimates.
Open workspacePercentage Calculator
Calculate percentages, relative change, increases, decreases and original values.
Open toolBMI Calculator
Calculate adult BMI with metric/US units, clear screening categories and private inputs.
Open toolLoan / Mortgage Calculator
Plan monthly payments, extra principal and interest savings with a full payment schedule.
Open toolCompound Interest Calculator
Project savings growth with regular contributions, explicit timing and a year-by-year balance table.
Open toolAge Calculator
Calculate calendar age, completed months, elapsed days and the next birthday from explicit dates.
Open toolDate Difference Calculator
Count signed elapsed or inclusive days between two calendar dates, with clear endpoint rules.
Open toolTip / Bill Split Calculator
Calculate a tip and equal bill split, with optional upward rounding and a visible collection difference.
Open toolDiscount Calculator
Compare stacked or additive discounts, final price and total savings without hidden assumptions.
Open toolGST / VAT Calculator
Add or extract tax using your supplied rate, with separate net, tax and gross amounts.
Open toolWeighted Average Calculator
Calculate an exact weighted mean from value/weight pairs and review each row’s contribution.
Open toolBreak Even Calculator
Find the sales volume needed to cover fixed costs, with whole-unit rounding and contribution margin.
Open toolMarkup / Margin Calculator
Calculate selling price from cost and a target markup or margin, with both percentages shown.
Open toolPrice per Unit Calculator
Compare two package prices using compatible quantities and rank them before rounding.
Open toolFuel Cost Calculator
Estimate journey fuel and cost with explicit distance, consumption and fuel-price units.
Open toolElectricity Cost Calculator
Estimate energy consumption and cost from power, operating time, duty cycle and your own tariff.
Open toolScale Calculator
Convert drawing and real-world lengths with an explicit drawing:real ratio and compatible units.
Open toolPace / Speed Converter
Convert speed and pace, including min/km and min/mile clock notation.
Open toolFraction / Decimal / Percentage Converter
Convert fractions, mixed numbers, recurring decimals and percentages with exact fraction arithmetic.
Open toolAspect Ratio Calculator
Calculate image proportions and linked dimensions with presets and a scale slider.
Open toolReading Time Estimator
Estimate reading and speaking time with custom speeds, optional pauses and a private summary.
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