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Free Online Calculators for Finance, Math and Everyday Decisions
Thoughtful calculators for money, science, technology, mathematics and everyday decisions—built to make complex questions feel simple.
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A calculator for every kind of question.
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Popular mortgage calculators.
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Mortgage calculator
Estimate payments, ownership costs, amortization and extra payments.
Open calculator → ⌂Mortgage affordability
Work backwards from income, debts, savings and reserves.
Open calculator → ↻Refinance calculator
Compare offers, costs, APR, break-even and long-term savings.
Open calculator → %Down payment calculator
Plan cash to close, reserves and the time needed to reach your goal.
Open calculator → ◇Home equity calculator
Estimate equity, borrowing room, payments and future growth.
Open calculator → LTVLoan-to-value calculator
Calculate LTV, CLTV, HCLTV, equity and target ratios.
Open calculator →Available now
Popular math calculators.
Most popular%
Percentage calculator
Calculate percentages, percentage increases and percentage decreases quickly and accurately.
Open calculator → Most popular x̄Average calculator
Enter a set of numbers to calculate its mean, sum, count, median, mode and range.
Open calculator → Most popular ∶Ratio calculator
Simplify ratios, compare equivalent ratios and solve missing values in proportions.
Open calculator → Most popular ∶Proportion calculator
Solve proportions by entering three values and finding the missing fourth value using cross multiplication.
Open calculator → Most popular /Fraction calculator
Add, subtract, multiply or divide fractions and mixed numbers, with simplified results and working.
Open calculator → Most popular .Decimal calculator
Calculate with positive or negative decimals, integers and scientific notation, then round the answer to the precision you need.
Open calculator → Most popular 1½Mixed numbers calculator
Calculate with mixed numbers, fractions, whole numbers and decimals. Get a reduced fraction, mixed number and decimal result.
Open calculator →Why Digital Calculators
Complex behind the scenes.
Clear where it matters.
Each tool explains the result, exposes important assumptions and helps you compare scenarios—not just produce a number.
Built for understanding
Plain-language inputs, transparent assumptions and results with context.
Designed for every screen
Fast, focused experiences from a phone, tablet or desktop.
Localized where it counts
Country-aware tools can reflect local terminology, conventions and rules.
Calculators for finance, mathematics and everyday questions
Our free online calculators turn complicated questions into clear, useful results. Explore tools for mortgages, loans, savings, interest, personal finance, mathematics and other everyday calculations.
Each calculator includes straightforward inputs, instant results and helpful explanations. Whether you are comparing financial scenarios, checking a formula or planning an important decision, you can adjust the figures and see how each change affects the outcome.
Financial calculator results are estimates for planning and comparison. Always confirm important figures with the relevant lender, provider or qualified professional before making a financial commitment.