How the numbers work
How we calculate
Clear assumptions for every Nestfigure calculator. Estimates for learning—not bank quotes or advice.
How the CD calculator works
How we estimate CD interest, what APY means in the tool, compounding choices, optional monthly deposits, and what we leave out (penalties, fees, taxes).
Read how it works → Open tool: CD Calculator How we calculateHow the raise calculator works
How we turn a raise percent or dollar amount into new annual, monthly, biweekly, and weekly pay—and optional rough tax views.
Read how it works → Open tool: Raise Calculator How we calculateHow the credit card payoff calculator works
How we estimate months and interest from balance, APR, and payment plan—and what we leave out (fees, promo rates, real issuer minimums).
Read how it works → Open tool: Credit Card Payoff How we calculateHow the overtime calculator works
How we estimate regular, OT, and double-time pay from rate, hours, and multipliers—and what we leave out (legal eligibility, taxes).
Read how it works → Open tool: Overtime Calculator How we calculateHow the paycheck calculator works
How we split gross by pay frequency and apply a tax rate you type—and what we leave out (IRS tables, state engines).
Read how it works → Open tool: Paycheck Calculator How we calculateHow the loan calculator works
How we estimate installment payments and interest from principal, APR, and term—and what we leave out (fees, variable rates).
Read how it works → Open tool: Loan Calculator How we calculateHow the student loan calculator works
How we estimate fixed-rate student loan payments and interest—and what we leave out (IDR, forgiveness, live rates).
Read how it works → Open tool: Student Loan Calculator How we calculateHow the auto loan calculator works
How we build amount financed from price, down payment, trade-in, tax, and fees, then amortize—and what we leave out.
Read how it works → Open tool: Auto Loan Calculator How we calculateHow the savings goal calculator works
How we estimate months to a savings target with monthly deposits and an APY input—and what we leave out (fees, live rates).
Read how it works → Open tool: Savings Goal Calculator How we calculateHow the compound interest calculator works
How we estimate future value from principal, rate, years, compounding, and optional deposits—and what we leave out.
Read how it works → Open tool: Compound Interest Calculator How we calculateHow the simple interest calculator works
How we estimate I = P × r × t on principal only, year schedules, and a simple-vs-compound contrast—and what we leave out.
Read how it works → Open tool: Simple Interest Calculator How we calculateHow the ROI calculator works
How we estimate total return on investment and optional annualized return—and what we leave out (fees, forecasts).
Read how it works → Open tool: ROI Calculator How we calculateHow the 401(k) calculator works
How we estimate employee deferrals, a sample employer match formula, and optional growth—and what we leave out.
Read how it works → Open tool: 401(k) Calculator How we calculateHow the break-even calculator works
How we estimate break-even units and revenue from fixed costs, price, and variable cost—and what we leave out.
Read how it works → Open tool: Break-Even Calculator How we calculateHow the savings duration calculator works
How we estimate months of runway from balance, fixed monthly withdrawals, and optional constant growth—and what we leave out.
Read how it works → Open tool: How Long Will Savings Last How we calculateHow the inflation calculator works
How we estimate future cost and past value with a constant average inflation rate—and what we leave out (live CPI tables).
Read how it works → Open tool: Inflation Calculator How we calculateHow the debt-to-income calculator works
How we estimate front-end and back-end DTI from gross income and monthly debts—and what we leave out (underwriting rules).
Read how it works → Open tool: Debt-to-Income Calculator How we calculateHow the mortgage calculator works
How we estimate principal and interest from home price, down payment, rate, and term—and what we leave out (PMI, live rates).
Read how it works → Open tool: Mortgage Calculator How we calculateHow the mortgage refinance calculator works
How we compare current vs new payments, interest, and break-even on closing costs—and what we leave out.
Read how it works → Open tool: Mortgage Refinance Calculator How we calculateHow the biweekly mortgage calculator works
How we compare monthly and biweekly amortization, interest saved, and time saved—and what we leave out.
Read how it works → Open tool: Biweekly Mortgage Calculator How we calculateHow the 50/30/20 budget calculator works
How we allocate take-home into needs, wants, and savings shares, optional actuals, and what we leave out.
Read how it works → Open tool: 50/30/20 Budget Calculator How we calculateHow the tip calculator works
How we estimate tip, total with tip, pretax tip base, and even splits—and what we leave out.
Read how it works → Open tool: Tip Calculator How we calculateHow the emergency fund calculator works
How we build a target from expenses × months, months covered, shortfall, and what we leave out.
Read how it works → Open tool: Emergency Fund Calculator How we calculateHow the net worth calculator works
How we sum assets and liabilities, compute net worth and debt-to-asset ratio—and what we leave out.
Read how it works → Open tool: Net Worth Calculator How we calculateHow the percent-off calculator works
How we compute discount, sale price, optional tax after discount, and quantity totals—and what we leave out.
Read how it works → Open tool: Percent Off Calculator How we calculateHow the commission calculator works
How we estimate commission from sales and rate, optional base and draw—and what we leave out.
Read how it works → Open tool: Commission Calculator How we calculateHow the hourly to salary calculator works
How we convert hourly rate, hours/week, and weeks/year to annual and period pay—and what we leave out.
Read how it works → Open tool: Hourly to Salary Calculator How we calculateHow the sales tax calculator works
How we add tax to pretax or reverse a total with tax—and what we leave out (no live ZIP rates).
Read how it works → Open tool: Sales Tax Calculator How we calculateHow the home affordability calculator works
How we estimate max home price from income, sample DTI caps, reverse amortization, and down payment—and what we leave out.
Read how it works → Open tool: Home Affordability CalculatorWho builds this
Content and tools are published by Nestfigure and maintained by John Rey Balais. Full bio: About Nestfigure.
Important note
Nestfigure is not a bank, broker, employer, or adviser. Calculator results are educational estimates under documented formulas. Deposit topics cite CFPB, FDIC, and NCUA materials where relevant; wage context cites BLS; withholding context cites IRS Publication 15-T. We do not invent rates, averages, or credentials.
YMYL notice: This site is for education only. It is not financial, tax, or investment advice. Nestfigure is not a bank, credit union, broker, investment adviser, or fiduciary. Product terms, rates, and penalties vary—always read your institution’s disclosures before acting. Calculator results are mathematical estimates, not bank quotes.