Math & Financial Calculators
Fast browser-based financial and mathematical calculators: compound interest, mortgage amortization, 3-way percentages, and age metrics.
Specific Heat Capacity & Calorimetry Calculator (Q = mcΔT, Thermal Equilibrium & Phase Changes)
Calculate heat transfer (Q = mcΔT), specific heat capacity (c), thermal equilibrium mixture temperature, and latent heat of phase changes with 30+ material presets.
Speed of Sound & Mach Number Calculator (c = √(γRT), Mediums & Mach Shockwave SVG)
Calculate the speed of sound in air, water, seawater, and metals using thermodynamic ideal gas laws (c = √(γRT)). Features Mach number solver, flight regime classifier, and vector Mach cone shockwave diagram.
Density, Mass & Volume Calculator (ρ = m/V, Specific Gravity & Archimedes Buoyancy)
Calculate density (ρ), mass (m), and volume (V) with 40+ authentic material presets (gold, silver, titanium, woods, liquids). Features Archimedes’ buoyancy simulator, specific gravity, and vector flotation tank SVG.
Kinetic & Potential Energy Calculator (Ek = ½mv², Ep = mgh & Energy Transfer SVG)
Calculate kinetic energy (Ek = ½mv²), gravitational potential energy (Ep = mgh), and spring elastic potential energy. Features vehicle braking distance solver, TNT equivalence converter, and interactive mechanical energy transfer simulator.
Projectile Motion & Trajectory Calculator (Apex, Range, Flight Time & Flight Path SVG)
Calculate projectile trajectory, maximum apex height, total flight time, horizontal range, and impact velocity given launch speed, angle, and initial elevation. Includes gravity selector and interactive SVG flight path.
Triangle Calculator — Law of Sines, Cosines, Area & Solver (SSS, SAS, ASA, AAS, SSA)
Solve triangles with any 3 known sides or angles. Calculates all sides, angles, area (Heron's formula), perimeter, semiperimeter, inradius, circumradius, and heights with interactive SVG diagram.
Percentage Calculator — 5-in-1 Master Solver with Proportional Bar
Free online percentage calculator. 5-in-1 solver for percentage of a number, proportion, percentage increase/decrease, reverse percentages, and relative difference with interactive SVG visual proportion bar.
Compound Interest Calculator with Monthly Deposits & Growth Chart
Calculate compound interest with initial principal, recurring monthly contributions, inflation adjustment, and year-by-year amortization schedule.
Mortgage Calculator with PITI, Amortization Schedule & Extra Payments
Free contractor-grade mortgage calculator. Computes exact PITI (Principal, Interest, Taxes, Insurance), PMI, extra payments, interest savings, and interactive SVG amortization schedule.
Tip & Bill Split Calculator (Pre-Tax vs Post-Tax & Dollar Rounding)
Calculate restaurant tips accurately on pre-tax subtotal or post-tax total, split bills evenly across 1 to 30 diners, round up to whole dollars for cash or Venmo, and inspect service quality benchmarks.
Roman Numerals Converter & Decoder (Standard & Vinculum Extended)
Convert numbers to Roman numerals and Roman numerals to numbers (1 to 3,999,999). Includes subtractive notation rules, Vinculum overline notation, and clockface IIII history.
Exact Age Calculator (Years, Months, Days, Lifetime Milestones & Next Birthday)
Calculate exact chronological age in years, months, days, hours, and minutes. Includes actuarial life progression SVG bar, planetary orbital ages, next birthday countdown, and biological milestone trackers.
College & High School GPA Calculator (Weighted, Unweighted & Target GPA Planner)
Calculate college and high school semester and cumulative GPA on 4.0, 4.33, and 5.0 weighted scales. Includes Honors and AP/IB credit weighting, target GPA graduation planner, and SVG honors standing gauge.
Fraction to Decimal Converter (with Repeating Decimals & Tape Measure)
Convert proper, improper, and mixed fractions into decimals, percentages, and millimeter equivalents. Detects repeating decimals and plots on an interactive tape measure.
Decimal to Fraction Converter (Simplified, Mixed & Tape Measure)
Convert any terminating or repeating decimal into a fully simplified fraction or mixed number. Solves repeating cycles algebraically with nearest 1/16", 1/32", and 1/64" tape measure ruler snapping.
Fraction Calculator (Add, Subtract, Multiply, Divide & Mixed Numbers)
Add, subtract, multiply, and divide fractions and mixed numbers. Instant step-by-step solutions with Least Common Denominator (LCD), Euclidean GCD reduction, and pure SVG visual fraction comparison bars.
Aspect Ratio Calculator — 16:9, 9:16, 4K Resizing & Video Scales
Free online aspect ratio calculator. Calculate pixel dimensions, reduce to simplified ratios via Euclidean GCD, preview letterboxing, and resize video formats (16:9, 9:16, 4:3, 21:9).
Scientific Notation Converter (Standard, E-Notation & Metric Prefixes)
Convert between standard decimal numbers, scientific notation (a × 10^b), engineering notation, and SI metric prefixes with significant figures and step-by-step math.
Percentage Increase Calculator (Formula, Steps & Multi-Period Projections)
Calculate percentage increase from starting value to final value, apply growth rates, avoid the asymmetric reversal trap, and project multi-period compound gains with interactive SVG growth bars.
Percentage Decrease Calculator (Discount, Savings & Asymmetric Loss Recovery)
Calculate percentage decrease, markdown sale discounts, stacked coupon savings, and the exact asymmetric gain required to recover from financial losses with interactive SVG contraction bars.
Standard Deviation Calculator (Sample & Population) with Step-by-Step Solution
Calculate sample (s) and population (σ) standard deviation, variance, mean, standard error, confidence intervals, quartiles, and outliers with step-by-step math.
Markup vs Margin Calculator — Profit, COGS & E-Commerce Fees
Free commercial markup and margin calculator. Converts markup % to gross margin %, factors Stripe/Amazon marketplace fees, shipping costs, and generates interactive SVG profit waterfalls.
Permutation and Combination Calculator (nPr & nCr with BigInt Precision)
Calculate permutations (nPr) and combinations (nCr) with exact BigInt factorials, repetition modes, step-by-step cancelation proofs, and lottery odds.
Birthday Paradox Calculator & Monte Carlo Simulator (Collision Math)
Why does a room of 23 people have a 50.7% chance of two sharing a birthday? Calculate probability, run 10,000-trial Monte Carlo simulations, and explore cryptographic hash collision attacks.