Free Online Calculators
Finance, math, health, construction, and everyday tools in one searchable catalog.
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Loan Calculator - Payments, Payoff & Amortization
Calculate a fixed loan payment, model extra-payment payoff, estimate an affordable loan amount, compare offers, and inspect annual or monthly amortization.
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Inflation Calculator — See How Inflation Affects Your Money
Compare official U.S. CPI-U annual averages through 2025, purchasing power, personal basket inflation, salary changes, and user-defined future scenarios.
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Scientific & Graphing Calculator — DEG/RAD, History & Memory
Evaluate safe scientific expressions with DEG or RAD mode, memory, history, result formatting, and an interactive graph for up to three functions.
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Compound Interest Calculator — Savings Growth & Goals
Project compound interest with monthly contributions, compare APR and APY, adjust for inflation, or calculate the monthly savings needed for a goal.
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Tubing Capacity Calculator
Calculate tubing capacity from a common size and weight, actual ID, or OD and wall thickness; total stepped strings and plan pump volume, time and strokes.
CalculateAnnular Space & Capacity Calculator
Calculate annular space capacity and volume, solve target fill length, total stepped intervals, and estimate bottoms-up strokes and circulation time.
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Age Calculator — Exact Age, Days & Next Birthday
Calculate exact calendar age in years, months and days, total elapsed days, hours and minutes, age on any date, and the next birthday.
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Baseboard Calculator — Boards & Cut List
Turn measured wall runs into boards to buy and a labelled cutting plan. Allow for saw cuts, fitting, stock ends and spare boards.
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Beam Deflection Calculator — Loads & Diagrams
Combine point and distributed loads on a simply supported or cantilever beam. Explore deflection, shear, bending moment and reactions in metric or US units.
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Board Foot Calculator — Lumber List & Cost
Add stock boards, compare supplier quote units and estimate your lumber order. See board feet, whole spare boards and a clear cost breakdown.
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Board and Batten Calculator — Spacing & Layout
Plan even batten spacing in inches or millimetres. Compare layouts, see a scaled wall and print precise installation marks.
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Body Fat Calculator — Navy Method & Lean Mass
Enter height, neck and waist (plus hip for the female equation) to see the estimate immediately; optionally add weight for fat mass, lean mass and a target scenario.
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