Calculator Tools

Calculate EMI, mortgage payments, BMI, compound interest, calories, salary, and more. 35 free calculators — instant results, no account required.

35 free tools

Stripe Fee Calculator

Calculate Stripe fees for any transaction across 20 countries — cards, ACH, SEPA, Apple Pay, Klarna, Connect, Subscriptions, Refunds, and Disputes. Forward and reverse modes, side-by-side comparisons with PayPal, Square, Braintree, and others, bulk CSV calculation, and shareable permalinks. Itemized breakdown with the exact formula, sourced from Stripe's official pricing pages. 100% in your browser.

IP Calculator

Calculate subnet mask, network address, broadcast, wildcard mask, usable hosts, and binary representation for any IPv4 or IPv6 CIDR. Includes VLSM, subnet splitter, and range-to-CIDR converter.

EMI Calculator

Calculate loan EMI, total interest, and amortization schedule instantly.

Mortgage Calculator

Calculate mortgage EMI, total interest, and full repayment schedule.

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Mortgage Affordability Calculator

Find out how much house you can afford based on income, debts, down payment, and interest rate.

Car Loan EMI Calculator

Calculate auto loan EMI, total interest, and amortization schedule.

Personal Loan EMI Calculator

Calculate personal loan EMI, interest, and repayment breakdown.

Education Loan EMI Calculator

Calculate student loan EMI, total interest, and repayment schedule.

Percentage Calculator

Calculate percentages, find what percent one number is of another, and more.

Age Calculator

Calculate your exact age in years, months, days, hours — and more.

Calorie Calculator

Calculate daily calorie needs, BMR, TDEE, calorie deficit, and macros.

Aspect Ratio Calculator

Find, simplify, and convert aspect ratios for images, video, and social media.

BMI Calculator

Calculate your Body Mass Index with ideal weight range and health category.

Body Fat Calculator

Calculate body fat percentage using the US Navy formula or BMI method. Includes ideal body fat range and fat loss calculator.

One Rep Max Calculator

Estimate your 1RM using 7 formulas (Epley, Brzycki, and more). Get training percentages, plate loads, and strength standards.

Retirement & FIRE Calculator

Monte Carlo retirement planning with 5,000 simulations. See your probability of success, fan chart, and year-by-year breakdown — 4% Rule or VPW, Social Security, Roth, pre-tax.

Coast FIRE Calculator

Find your Coast FIRE number — the portfolio size that grows to your retirement goal with no further contributions. Monte Carlo simulation, browser-only.

Lean FIRE Calculator

Plan early retirement on a lean $25K–$40K/year budget. Monte Carlo success probability with frugal spending assumptions and long-horizon simulation.

Fat FIRE Calculator

Model early retirement with $100K+ annual spending. Fan chart, success rate, and year-by-year table with federal tax modeling for high-income FIRE.

Rent vs Buy Calculator

Monte Carlo rent vs buy analysis with 5,000 scenarios, full US tax modeling (SALT cap, standard vs itemized, capital gains exclusion), and opportunity cost of the down payment. Free, no paywall.

Dividend Calculator

Calculate dividend yield, project DRIP reinvestment growth over 40 years, and build a monthly income portfolio. Handles SCHD, VOO, MSTY, JEPQ, QQQI and 100+ dividend stocks & ETFs including YieldMax covered-call products.

Compound Interest Calculator

Calculate how your savings grow with daily, monthly, or annual compounding. Includes growth chart, year-by-year schedule, and simple vs compound interest comparison.

SIP Calculator

Calculate future value of your monthly SIP investments with compound returns. Includes year-wise growth chart, step-up SIP, and goal-based reverse calculator.

Salary Calculator

Convert hourly wage to yearly salary or annual to hourly. Includes overtime and tax estimates.

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Paycheck Calculator

Calculate your take-home pay after federal, state & local taxes, 401k, and deductions. Supports US (all 50 states), UK, Canada, Australia, and India.

GPA Calculator

Calculate semester and cumulative GPA across 4.0, 5.0, and international grading scales.

Final Grade Calculator

Find out what score you need on your final exam to reach your target course grade.

Grade Calculator

Calculate your current course grade from weighted assignments or total points earned.

GPA Scale Converter

Convert between percentage, letter grades, 4.0, 4.3, 5.0, and international GPA scales.

Weighted Grade Calculator

Track your full syllabus across a semester. Weighted categories with assignments, drop-lowest, extra credit, what-if scenarios, target-grade reverse calculation, snapshots, and save-state — all in your browser.

LLM Cost Calculator

Compare token counts and API costs across GPT-5, Claude Opus 4.7, Gemini 3, and more — all in your browser.

Math Problem Steps

Solve equations, derivatives, and integrals with full step-by-step explanations — algebra through calculus, free, no paywall, runs in your browser.

Pregnancy Due Date Calculator

Find your estimated due date from LMP, conception, ultrasound, or IVF transfer date. See your current week, trimester, and key milestones — free, private, runs in your browser.

Gravel Calculator

Estimate gravel by the cubic yard, ton, or truckload — for driveways, walkways, French drains, and landscaping. Real density ranges, compaction and waste built in, multi-region projects, layered driveway builds, and total cost. Imperial or metric, 100% in your browser.

Swim Time Converter

Convert competitive swim times between Short Course Yards (25y), Short Course Meters (25m), and Long Course Meters (50m) with stroke- and distance-specific factors. Four conversion models compared side-by-side (Classical, USA Swimming, NCAA, Performance), USA Swimming and NCAA time-standard cuts, roster mode for coaches with up to 200 swims, factor transparency, share via permalink, no signup, your data stays in your browser.