Calculate your running, walking, or cycling pace and speed, predict race finish times, and view split breakdowns.
Enter your details and hit calculate to see your pace, speed, and splits.
Estimated finish times for standard race distances using Riegel's formula (assumes proper endurance training).
Understanding pacing strategies for training and racing.
80% of your training should be done at an "easy pace" (conversational pace), which is typically 60-90 seconds per mile slower than your 5K race pace. This builds aerobic capacity without overtraining.
A "negative split" strategy involves running the second half of a race faster than the first. By starting conservatively, you save glycogen stores and can push harder at the end, often resulting in better overall finish times.
Our race predictions use Peter Riegel's formula: $T_2 = T_1 \times (D_2 / D_1)^{1.06}$. It accurately predicts race times assuming you have completed the specific endurance training required for the longer distance.
Pace and speed describe the same underlying relationship between time and distance, just inverted. Pace expresses how much time it takes to cover one unit of distance (useful for r...
The calculator uses the simple relationship Pace = Time / Distance, so entering any two of pace, time, and distance lets it solve for the third. Speed is calculated separately as Distance / Time, converted to kilometers or miles per hour, and is used to classify your effort as walking, jogging, running, or cycling.
Finish-time predictions for other distances use Riegel's endurance formula: Predicted Time = Known Time × (New Distance / Known Distance)^1.06. This formula assumes you have trained appropriately for the longer distance, so predictions get less reliable the further they extrapolate beyond a runner's actual race history.
Running 5K in 25:00 gives a pace of 5:00 per kilometer. Applying Riegel's formula to predict a 10K time: 1,500 seconds × (10/5)^1.06 ≈ 3,127 seconds, or about 52 minutes 7 seconds — noticeably more than double the 5K time because pace naturally slows over longer distances.
Once a pace is calculated, the tool generates per-kilometer or per-mile split times so you can pace a race evenly from start to finish. Combine this with the Steps to Calories Calculator or TDEE Calculator to estimate the energy cost of your training runs.
Quick answers about how this tool works.
Pace is the amount of time it takes to cover a specific distance (e.g., minutes per mile or kilometer). Speed is the distance covered in a specific amount of time (e.g., miles per hour or kilometers per hour). Runners typically use Pace, while cyclists often use Speed.
The predictions use established formulas (like Riegel's formula) which assume you have done the appropriate endurance training for the target distance. While highly accurate for experienced runners, beginners may find their marathon times are slightly slower than predicted by their 5K times due to the endurance factor.
Pace is the time it takes to cover a specific distance, usually expressed as minutes per mile (min/mi) or minutes per kilometer (min/km).
Divide your target finishing time by the race distance. E.g., to run a 5K in 25 minutes, your target pace is 5 minutes per kilometer.
Plain-language explainers that sit next to this tool.
A blood pressure reading of "120/80" means nothing until you know the categories. Here is the full AHA chart, how ranges shift with age, and when a number becomes an emergency.
A BMI of 25 is "overweight" for a Western adult, but research shows South Asians carry significantly more body fat at the same BMI — and face higher metabolic risk. The WHO recognises lower BMI thresholds for Asians. Here is what the research says and why it matters.
Most Indians accept an EMI figure from their bank without questioning it. This guide explains exactly how Indian banks calculate EMI — the reducing balance method, how RBI repo rate changes flow through to your loan, and what you can do to pay off your home loan years early.
The answer to "how many calories per day" is not the same for everyone. Your TDEE — Total Daily Energy Expenditure — depends on your weight, height, age, sex, and activity level. Here is the exact formula and tables by goal.
Search 190+ free tools by name, or pick a category below. Every one runs instantly in your browser — no signup, nothing to install.
Tap a star to rate us instantly.
