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Finance & Math Tools

Calculators for loans, interest, and estimates.

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Calculate whole units needed to cover fixed costs and an optional target profit.

Model compound growth with contributions, timing, fees, and inflation assumptions.

Calculate final price after discount and tax.

Calculate equal monthly installments for a fixed-rate loan.

Estimate a billing rate from an income target, expenses, reserves, fees, and billable hours.

Estimate and split trip costs with explicit distance, efficiency, and fuel-price units.

Add or extract GST from an amount using the rate you enter.

Compare historical U.S. monthly CPI or model purchasing power with your own index or assumed rate.

Project investments with contributions, fees, modeled gain tax, and inflation assumptions.

Estimate monthly principal and interest, total interest, and preview up to 60 amortization payments.

Model mortgage payments, entered housing costs, extra principal, and scheduled rate changes.

Calculate percentages, percentage differences, and additions.

Calculate markup and selling margin after optional additional item costs.

Calculate margin from revenue, direct costs, and additional entered expenses.

Convert gross salary and estimate a regular paycheck using 2026 U.S. withholding or your entered deductions.

Calculate simple interest earned on an original principal.

Model recurring investments with deposit timing, costs, and explicit return assumptions.

Estimate 2026 U.S. regular federal income tax or use your verified custom tax bands.

Calculate tips and split bills.

Add or extract VAT using a verified rate you supply.