Making math fast and accessible for everyone
SwiftCalculators exists because everyday calculations shouldn't require a textbook, a subscription, or a trip to a complicated app. Whether you're figuring out a mortgage payment, tracking your fitness, converting units for a recipe, or just checking percentages — you deserve a fast, reliable answer with no friction.
Every tool on this site is built to work instantly in your browser, give accurate results, and get out of your way. No sign-up required and no cost. Math should never be a barrier.
293 tools — 211 calculators and 82 unit converters
From BMI and calorie counters to mortgage amortization tables, compound interest projections, geometry solvers, engineering unit converters, and much more — every tool is hand-crafted with verified formulas and tested for accuracy.
We cover health, finance, math, time & date, engineering & science, construction & practical tasks, miscellaneous tools, and 82 unit converters. New tools are added regularly based on what people actually need.
Built for speed, accuracy, and privacy
Everything we build follows the same principles — no clutter, no barriers, just results.
Your privacy
We don't track you across the web or sell your data. Your calculations run entirely in your browser — nothing you type into a calculator is sent to our servers. We use minimal, anonymous analytics to understand which tools are most popular so we can keep improving.
Find the right tool for the job
Every category is packed with purpose-built tools. Pick one to explore.
Ready to calculate?
Browse 293 free tools — no signup needed.