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More calculators around the web
Tools we don’t host yet, from publishers and official agencies we trust. When you need something beyond our own collection, start here.
All-purpose calculator hubs
Massive general-purpose libraries covering finance, math, health, and more — good when you need something we don't host yet.
Hundreds of free calculators across finance, fitness, math, and science.
Visit site →External toolOmni Calculator3,000+ well-explained calculators with the formulas shown for every tool.
Visit site →External toolCalculatorSoupClean, no-frills math and finance calculators with step-by-step results.
Visit site →External toolThe Calculator SiteEveryday finance, construction, and conversion calculators in one place.
Visit site →External toolWolfram AlphaComputational engine that solves and graphs almost any math or science query.
Visit site →Finance & money
Mortgage, loan, retirement, and tax tools from trusted finance publishers and official agencies.
Mortgage, auto, loan, retirement, and debt calculators from a major finance site.
Visit site →External toolNerdWallet CalculatorsBudgeting, loan, mortgage, and retirement calculators with plain-English guidance.
Visit site →External toolDinkytown Financial Calculators400+ in-depth financial calculators covering nearly every money scenario.
Visit site →Official sourceIRS Tax Withholding EstimatorThe official IRS tool to check and adjust your federal paycheck withholding.
Visit site →Official sourceSSA Benefit CalculatorsOfficial Social Security retirement benefit estimators based on your earnings.
Visit site →Official sourceInvestor.gov Compound InterestThe SEC's official compound interest and savings-goal calculators.
Visit site →Construction & home
Material estimators and project calculators for builders, contractors, and DIYers.
Deep library of construction calculators — concrete, framing, flooring, and more.
Visit site →External toolOmni Construction CalculatorsMaterial and cost calculators with the math explained for each project type.
Visit site →External toolInch Calculator — ConcreteSpecialized concrete calculators for slabs, footings, columns, and post holes.
Visit site →Health & fitness
Body metrics and nutrition tools, including official CDC guidance.
The official CDC body mass index calculator and category guidance for adults.
Visit site →External toolOmni Health CalculatorsCalorie, body-fat, pregnancy, and dozens of other validated health calculators.
Visit site →External toolCalculator.net Fitness & HealthBMI, BMR, calorie, macro, and body-fat calculators with standard formulas.
Visit site →External toolWebMD BMI CalculatorQuick BMI calculator paired with medically reviewed weight guidance.
Visit site →Math & everyday
Percentages, conversions, and general math from the big general-purpose engines.
Percentage, fraction, scientific, and other core math calculators.
Visit site →External toolCalculatorSoup MathStep-by-step math calculators for arithmetic, fractions, and statistics.
Visit site →External toolWolfram AlphaType almost any math question and get a worked answer with graphs.
Visit site →External links are provided for convenience and are not endorsements. We aren’t responsible for third-party content or accuracy. Official agency tools are marked.