Smart Calculators & Converters with Step-by-Step Solutions
For school, university, and professional engineering: Solve mathematical problems and unit conversions with transparent step-by-step explanations and crisp formula rendering.
Everyday & Business Calculators
Practical tools for office, logistics, and everyday life – from date ranges and deadlines to GS1 checksum validation.
Date & Age Calculator with Business Days
Calculate exact time intervals between two dates, net business days (Mon–Fri), exact chronological age in years, months, days and hours, and statutory deadlines.
EAN Check Digit Calculator & Barcode Generator
Calculate official GS1 Modulo-10 check digits for EAN-13, EAN-8, UPC, and ISBN-13 barcodes and export vector SVG/PNG codes.
Finance & Loan Calculators
Sound calculations for mortgages, loans, and interest with comprehensive amortization schedules.
Mortgage & Loan Repayment Calculator
Calculate monthly payments, interest vs. principal breakdown, remaining balance, and amortization schedule for mortgage loans.
Net Salary Calculator 2025
Calculate your net salary from gross pay – all 6 German tax classes, church tax, health/pension/unemployment/nursing care insurance, and solidarity surcharge for Germany, Austria, and Switzerland.
VAT / Sales Tax Calculator 2025 / 2026
Calculate Net, Gross, and VAT for Germany (19% / 7%), Austria (20% / 10% / 13%), Switzerland (8.1% / 2.6% / 3.8%) & EU including cash discount and rebate.
Discount & Cash Discount Calculator (Net & Gross)
Calculate trade discounts, early payment cash discounts, and VAT with transparent stage calculations, total savings, and effective interest rate analysis.
Mathematics Calculators with Step-by-Step Solutions
Step-by-step through calculus, algebra, geometry, and statistics with comprehensive explanations and visualizations.
Percentage Calculator with Steps
Free online percentage calculator: Calculate percentage of a number, percentage difference, discount, sales tax, and percentage change with clear step-by-step solutions.
Rule of Three Calculator (Direct & Inverse Proportion)
Solve direct and inverse proportionality problems with detailed intermediate step breakdown, proportional ratio tables, and clear explanations.
Fraction Calculator with Step-by-Step Reduction
Add, subtract, multiply, and divide fractions online with Least Common Denominator (LCD), simplification steps, mixed numbers, and decimal conversion.
Quadratic Equation Solver (Quadratic Formula & pq-Formula)
Solve quadratic equations step by step with discriminant calculation, vertex coordinates, real/complex roots, and factored form.
Binomial Formulas Calculator & Term Expansion
Expand and factorize 1st, 2nd, and 3rd binomial formulas online. Includes completing the square, Pascal's triangle, and geometric area visualizer.
Derivative Calculator & Differentiation Rules Trainer
Online derivative calculator with step-by-step explanations for power, product, quotient, and chain rules. Includes interactive slope visualizer and trainer.
Limits & Asymptotes Calculator (L'Hospital's Rule)
Calculate limits as x approaches infinity and finite points x0. Analyze horizontal, vertical, and oblique asymptotes with L'Hospital's rule.
Curve Sketching & Function Analysis Calculator
Complete curve sketching for polynomial functions step by step: roots, derivatives, local extrema, inflection points, symmetry, and 2D graph.
Integral Calculator & Area Under Curve (Fundamental Theorem & Solids of Revolution)
Calculate integrals online: Definite integrals, geometric area with root-splitting, area between curves, and solids of revolution with 2D visualizer.
Function Reconstruction & Curve Fitting Calculator
Solve function reconstruction problems online: Find polynomial coefficients from points, extrema, inflection points, symmetries, and tangents using linear systems.
Optimization Problems & Applied Extrema Calculator
Solve optimization problems with constraints online: Primary equation, constraint, target function, derivative, and boundary test with 2D graph.
Exponential Functions & Growth Models Calculator
Calculate exponential functions online: Exponential growth, decay, half-life, limited and logistic growth with 2D plotter.
Probability Tree & Contingency Table Calculator
Calculate tree diagrams, 1st & 2nd path rules, Bayes theorem and 2x2 contingency tables online. Interactive 2D tree visualizer and trainer.
Triangle Calculator – Law of Sines & Cosines
Solve general triangles online: SSS, SAS, ASA, SSA. Law of sines, law of cosines, Heron area, heights, incircle and circumcircle with 2D visualization.
Matrix Calculator (2x2 & 3x3 Operations & Determinant)
Calculate matrix addition, subtraction, matrix multiplication, determinants, inverses, and transposes with full intermediate step algebra.
Vector Calculator 2D & 3D (Dot, Cross & Triple Product)
Online vector calculator for 2D and 3D vectors: vector addition, dot product, cross product, scalar triple product, magnitude, angle & 3D visualizer.
Analytic Geometry 3D Calculator (Lines, Planes & Distances)
Calculate 3D analytic geometry online: plane form conversions (Hesse normal form), line-line relations, line-plane intersections, angles, and distances.
Descriptive Statistics Calculator (Mean, Median, Std Dev)
Calculate summary statistics for datasets: arithmetic mean, median, mode, sample variance, standard deviation, interquartile range (IQR), and quartiles.
Geometry Calculator: Areas & 3D Solids (2D / 3D)
Accurate geometry calculator for 2D areas (circle, ellipse, trapezoid, parallelogram) and 3D solids (cuboid, cylinder, cone, sphere, pyramid) with interactive visualizer and trainer.
Sine & Cosine Function Calculator
Calculate sine and cosine functions online: amplitude, period, phase shift, midline, unit circle, solve trig equations & modeling from Grade 10 to calculus.
Unit & Time Converters
Instant conversions for world time zones, physical units, and numeral systems.
Time Zone & World Clock Converter
Convert times and dates between global time zones instantly, plan international team meetings with a 24-hour visual matrix, and compare worldwide local times.
Universal Unit Converter (Length, Area, Volume, Angle)
High-precision unit converter for mathematics and physics: Lengths (m, km, ft, in), Areas (m², ha, sq ft), Volumes (L, m³, gallons), and Angles (Degrees ↔ Radians).
Number Base Converter (Binary, Octal, Decimal, Hexadecimal)
Convert numbers between Binary (Base 2), Octal (Base 8), Decimal (Base 10), and Hexadecimal (Base 16) with detailed positional notation conversion steps.
Health & Fitness Calculators
Scientifically validated biometry calculators for body fat, metabolism, and cardiovascular prevention.
Why ToolPanda is the Best Choice for Your Calculations
Full Step-by-Step Solutions
Never get just a raw number: Understand every intermediate algebraic step, formula rearrangement, and rule with pedagogical guidance.
Sharp Formula Rendering
Crystal clear LaTeX mathematical equations and fractions rendered with KaTeX – exactly like in textbook quality.
Arbitrary-Precision Arithmetic
Zero floating-point rounding errors. All calculations use high-precision decimal arithmetic.
Mobile-First Design
Engineered for smartphones and tablets with touch-friendly inputs, sticky result bars, and dark mode support.