489 browser tools. Every result explained.
Calculators and tools that show their work.
CalcForge runs in your browser with no signup and no uploads. Each tool page includes the formula, worked examples, and source citations — not just the final number.
Start by category
Each category uses the same private, browser-first interaction model, with page layouts tuned for the tool type.
Developer Tools
JSON formatters, Base64 encoders, JWT decoders, UUID generators, and more developer utilities.
52 tools →↯Quick Tools
Coin flips, dice rollers, random pickers, password generators, and other instant utilities.
47 tools →🐾Pet & Animal Tools
Dog age estimators, cat age converters, aquarium volume tools, and feeding guides.
121 tools →$Finance Calculators
Mortgage calculators, compound interest tools, loan amortization, debt payoff, and retirement projections.
71 tools →∑Math Calculators
Percentage, age, date, and everyday math utilities for quick classroom, homework, and planning tasks.
44 tools →+Health Calculators
BMI and wellness estimation tools with clear non-medical disclaimers for general reference only.
29 tools →✦Astrology Calculators
Zodiac, birth chart, moon phase, and Chinese zodiac cultural-reference calculators.
117 tools →