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Browser-based • 292 free calculators

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Free online calculators and unit converters for money, health, construction, cooking, and everyday math. Every calculation runs in your browser — no account, no uploads, no waiting.

Private by design

Calculations run locally in your browser. Values you enter never leave your device.

Formulas in the open

Every tool documents its method, assumptions, and a worked example you can check.

A real library

292 calculators and converters across 12 categories, with a searchable directory.

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Featured calculators

Essential

Percentage Calculator

Find percentage of a value, percentage increase/decrease, and ratios instantly.

New

Graphing Calculator

Plot and compare explicit functions with an interactive coordinate plane.

Admissions

APS Score Calculator

Convert National Senior Certificate percentages into admission points and check the statutory pass level.

Statistics

Variance Calculator

Calculate sample and population variance, standard deviation, mean, and range from a list of values.

Probability

Normal Distribution Calculator

Find the probability between two values, z-scores, and the middle 68% and 95% ranges of a normal distribution.

Geometry

Triangle Calculator

Solve SSS, SAS, ASA, and AAS triangles with the law of sines and cosines, including area and perimeter.

Wealth

Compound Interest & SIP Calculator

Project fixed-rate compound growth with monthly contributions, including SIP-style scenarios.

Finance & MoneyOpen Tool
Finance

Home Loan EMI & Mortgage Calculator

Estimate a home loan EMI or mortgage payment, total interest, taxes, insurance, and amortization.

Finance & MoneyOpen Tool
Home

Refinance Calculator

Find your break-even point and monthly savings when refinancing a mortgage.

Finance & MoneyOpen Tool
Home

Loan Prepayment & Amortization Calculator

See how extra monthly payments change a fixed-rate loan payoff schedule and total interest.

Finance & MoneyOpen Tool
Home

Mortgage Affordability Calculator

Find the maximum home price your income and debts support.

Finance & MoneyOpen Tool
Home

Rent vs Buy Calculator

Compare total renting cost against buying, including the equity you build.

Finance & MoneyOpen Tool
Challenge

Daily Savings Goal Challenge

Break any big target into a daily deposit rate and see the weekly and monthly pace.

Start planning
292 tools

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Explore the full directory of free calculators and unit converters across every category.

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Popular tools

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Essential

Percentage Calculator

Find percentage of a value, percentage increase/decrease, and ratios instantly.

Shopping

Discount & Sales Tax Calculator

Compute discounted prices, stacking promo codes, and final checkout totals.

Business

Markup & Margin Calculator

Convert markup percentages to margin and set profitable selling prices.

Science

Scientific Calculator

Full scientific calculator with trigonometry, logarithms, exponents, factorials, and keyboard support.

Statistics

Standard Deviation Calculator

Calculate mean, median, sample and population standard deviation, variance, and more from a list of numbers.

Statistics

Mean, Median & Mode Calculator

Find the mean, median, and mode of any dataset with range, sum, and count.

School

Final Grade Needed Calculator

Find out what score you need on the final exam to achieve your target grade.

New

Graphing Calculator

Plot and compare explicit functions with an interactive coordinate plane.

Admissions

APS Score Calculator

Convert National Senior Certificate percentages into admission points and check the statutory pass level.

Statistics

Confidence Interval Calculator

Find the confidence interval for a sample mean, with margin of error, standard error, and critical value.

Statistics

Sample Size Calculator

Calculate the survey or study sample size needed for a target confidence level and margin of error.

Statistics

Variance Calculator

Calculate sample and population variance, standard deviation, mean, and range from a list of values.