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Sports Betting Calculators & Tools (2026)

39 professional tools for odds conversion, parlay calculation, arbitrage detection, Kelly Criterion sizing, and real-time market analysis.

39Calculators
1M+Calculations
100%Free
Mathematically Verified
Evgeny Volkov (Senior iGaming Developer)Last audit: February 2026How do we calculate?

Essential Sports Betting Calculators

Basic tools for odds conversion and calculations

Convert odds between decimal, fractional, and American formats instantly. Calculate implied probability and compare value across different bookmakers worldwide.

PRL

Parlay Calculator

Calculate your accumulator odds and potential payout

Beginner
IMP

Implied Probability Calculator

Convert odds to probability and calculate bookmaker margin

Beginner
MRG

Margin Calculator

Calculate bookmaker margin and find fair odds

Intermediate

Live Betting Tools & Odds Tracking

LIVE

Real-time odds, arbitrage scanner, and market analysis

Real-time odds comparison and sure bet detection across 50+ bookmakers. Track line movements and find value opportunities as they happen.

LVO

Live Odds Comparison

TOP

Compare real-time odds from 20+ bookmakers and find the best value

Live
VBF

Value Bet Finder

Find +EV bets by comparing odds against sharp bookmaker prices

Pro
OMV

Odds Movement Tracker

Track line movements and identify steam moves

Pro

Arbitrage & Hedge Betting Calculators

Find sure bets and lock in guaranteed profits

Calculate optimal stake distribution for guaranteed profits regardless of outcome. Find mathematical edges with hedge betting and dutching strategies.

HDG

Hedge Bet Calculator

Calculate the optimal hedge bet to lock in guaranteed profit

Intermediate
DTH

Dutching Calculator

Bet on multiple outcomes and win the same amount regardless of which wins

Pro
LAY

Lay Bet Calculator

Calculate lay stakes for betting exchanges like Betfair

Pro
MBT

Matched Betting Calculator

Calculate profit from free bet promotions

Pro

Bankroll Management & Staking Plans

Optimize bet sizing and grow your bankroll

Apply Kelly Criterion and other professional staking methods to maximize long-term growth while minimizing risk of ruin.

ROR

Risk of Ruin Calculator

TOP

Calculate the mathematical probability of losing your entire bankroll based on your win rate, odds, and stake size.

Intermediate
VBT

Value Bet Calculator

Find positive expected value betting opportunities

Intermediate
STK

Staking Plan Calculator

Compare different bet sizing strategies to find your optimal approach

Pro
BKG

Bankroll Growth Calculator

Project your bankroll growth based on win rate, odds, and stake size

Intermediate

Bet Tracking & Performance Analytics

Track your bets, profits, and performance

Monitor ROI, yield, and P&L across all your bets. Identify profitable patterns and eliminate costly mistakes with data-driven analysis.

BTR

Bet Tracker

TOP

Track your bets, analyze performance, and calculate ROI

Beginner
TPT

Tipster Tracker

Track and verify tipster performance with scam detection

Intermediate
BMT

Bookmaker Tracker

Track your performance by sportsbook and find the best value

Intermediate
PFG

Profit Graph

Visualize your betting performance over time

Beginner

Advanced Analytics & Betting Edge

Advanced analysis to find your edge

Advanced metrics including Closing Line Value (CLV), edge detection, and variance analysis used by professional sharp bettors.

CLV

CLV Calculator

TOP

Calculate and track your Closing Line Value to measure if you're beating the market

Pro
EDG

Edge Analyzer

Discover your betting strengths and weaknesses with AI-powered pattern analysis

Pro
VAR

Variance Analyzer

Understand if you're running hot or cold with statistical analysis

Pro
LKS

Betting Leaks Finder

Identify where you're losing money and fix your strategy

Pro

Specialized Bet Types & System Bets

registry — specialized bet types & system bets
13 modules loaded ready_
execution-venues :: verified providers
ONLINE
VNE

Verified Execution Venues

Low-margin providers tested for speed & reliability

6.5
1win
1win
PRVDR_01
VERIFIED_TODAY
Initial Allocation
+500% DEPOSIT
⚠ Allocation expires with session
Margin
2.5%
Payout
< 2h
Rating
4.5/5
Allocation Pool94% CLAIMED
21 users viewing now
SESSION
04:59
> SECURE_ALLOCATION
8.6
Mostbet
Mostbet
PRVDR_02
VERIFIED_TODAY
Initial Allocation
+125% FIRST BET
⚠ Allocation expires with session
Margin
3.1%
Payout
< 4h
Rating
4.3/5
Allocation Pool87% CLAIMED
14 users viewing now
SESSION
04:59
> SECURE_ALLOCATION
8.4
Pin-Up
Pin-Up
PRVDR_03
VERIFIED_TODAY
Initial Allocation
+120% WELCOME
⚠ Allocation expires with session
Margin
3.8%
Payout
< 6h
Rating
4.2/5
Allocation Pool91% CLAIMED
18 users viewing now
SESSION
04:59
> SECURE_ALLOCATION
8.8
Vavada
Vavada
PRVDR_04
VERIFIED_TODAY
Initial Allocation
+100% BONUS
⚠ Allocation expires with session
Margin
2.9%
Payout
< 1h
Rating
4.4/5
Allocation Pool96% CLAIMED
23 users viewing now
SESSION
04:59
> SECURE_ALLOCATION
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Some links may be affiliate links. This doesn't affect our calculations — all formulas are mathematically neutral.

BETTING TOOLS

Frequently Asked Questions

Everything you need to know about betting calculators

A betting odds converter is a free tool that converts odds between different formats: decimal (European), fractional (UK), American (Moneyline), and implied probability. This helps bettors understand odds from different bookmakers worldwide and compare value across markets.
A parlay calculator multiplies the decimal odds of all your selections together to calculate the total combined odds and potential payout. Simply enter your stake and the odds for each leg, and the calculator shows your potential winnings if all selections win.
Arbitrage betting (sure betting) involves placing bets on all possible outcomes across different bookmakers to guarantee a profit regardless of the result. It is legal in most jurisdictions, but bookmakers may limit or close accounts of suspected arbers.
The Kelly Criterion is a mathematical formula that calculates the optimal bet size based on your perceived edge and bankroll. It maximizes long-term growth while minimizing the risk of ruin. Many professional bettors use fractional Kelly (25-50%) for added safety.
Yes! All 37+ betting calculators on ToolsGambling are 100% free to use. No registration required, no hidden fees, no limits. Available in 6 languages. We believe everyone should have access to professional betting tools.
Minor differences can occur due to: (1) Odds rounding — bookmakers often round odds to standard increments; (2) Live betting delays — odds change rapidly during live events; (3) Currency conversion — exchange rates may affect displayed values; (4) Bookmaker rules — some have specific payout rules for dead heats or partial wins. Our calculators use mathematically precise formulas, but always verify final payouts with your bookmaker before placing bets.
Expected value is the average amount you can expect to win or lose per bet over time. A positive EV (+EV) means the bet is profitable long-term. Calculate it with: EV = (Probability × Profit) − (1 − Probability) × Stake. Our value bet calculator finds +EV opportunities automatically by comparing your estimated probability to the bookmaker's odds.
Implied probability converts odds into a percentage chance. For decimal odds: divide 1 by the odds (1 ÷ 2.50 = 40%). For American odds: divide 100 by the odds plus 100 for positive odds, or divide the odds by odds plus 100 for negative. Use our odds converter to instantly see implied probability for any format.
The Kelly Criterion is mathematically proven to maximize long-term bankroll growth. Most pros use fractional Kelly (25-50% of the full Kelly stake) for safety. Other popular methods include flat staking (fixed % of bankroll) and the proportional staking plan. The right strategy depends on your edge, bankroll size, and risk tolerance.

Professional Betting Calculators for Smart Bettors

ToolsGambling offers the most comprehensive collection of free betting calculators online. Whether you're calculating parlay odds, finding arbitrage opportunities, or determining optimal bet sizes with the Kelly Criterion, our tools help you make data-driven decisions.

Our calculators support all major odds formats including decimal, fractional, American, and implied probability. From basic odds conversion to advanced analytics like CLV (Closing Line Value) tracking and variance analysis, we have tools for bettors at every level.

All calculators are free, require no registration, and are available in English, Russian, German, Spanish, Portuguese, and Turkish. Start making smarter bets today with professional-grade tools used by sharp bettors worldwide.