Percentage
Enter the percentage and the number it applies to. For example, enter 20 and 250 to find 20% of 250.
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Choose the collection that fits your audience.
Every calculator is free, works without an account, and can be linked or embedded. There is no sponsorship, affiliate arrangement, or reciprocal-link condition.
Teachers and students
Guided math tools with examples, visible methods, and no account requirement.
Linear Equation
Solve equations in the form ax + b = c with clear substitution and verification steps.
Function Graph
Graph a cubic polynomial ax³ + bx² + cx + d over a custom x-range with a live coordinate plot.
Normal Distribution
Find a z-score and cumulative probability for a normally distributed value.
Financial educators and credit unions
Practical money tools that keep rates, terms, fees, and total cost visible.
Monthly Budget
Compare monthly take-home income with essential, flexible, and savings allocations.
Credit Card Payoff
Estimate payoff time and interest for a credit-card balance using a fixed monthly payment.
Compound Interest
Project investment growth with compound returns and regular monthly contributions.
Car Affordability
Start with a total monthly car budget, subtract running costs, then estimate the vehicle price that fits the remaining loan payment.
Automotive publishers
Vehicle tools covering price, trade equity, financing, ownership, and depreciation.
Car Payment
Estimate your monthly car payment, amount financed, taxes, total interest, and the effect of your trade-in.
Dealer vs Bank Financing
Compare dealer and outside auto financing including rebates and fees.
Negative Equity Recovery
Estimate when an auto-loan balance may fall below projected vehicle value.
Car Running Cost
Add the recurring cash costs of owning a car, then inspect depreciation separately so you do not count the same vehicle cost twice.
Housing educators
Connected tools for affordability, mortgage cost, rent comparisons, taxes, and transaction cash.
Mortgage Affordability
Estimate a home price ceiling from income, debts, down payment, interest rate, taxes, insurance, and adjustable budget limits.
Mortgage
Estimate a monthly mortgage payment including principal, interest, property tax, and insurance.
Rent vs Buy
Compare renting with buying using housing costs, appreciation, maintenance, transaction costs, and an investment alternative.
Property Tax Reassessment
Estimate the budget effect of a new assessed value or effective tax rate.
Small-business publishers
Operating calculators for price, margin, break-even, cash, payroll, and ecommerce contribution.
Profit Margin
Calculate gross profit, profit margin, and markup from revenue and direct cost.
Business Break-even
Calculate the units and revenue needed to cover fixed costs or reach a target profit.
Business Cash Runway
Estimate how long available cash lasts under current net burn and planned changes.
Ecommerce Profitability
Estimate per-order contribution and monthly profit after fulfillment, platform, ad, and return costs.